JP3798000B2 - Information transfer device, information transfer method, and computer-readable recording medium recording information transfer program - Google Patents

Description

  The present invention relates to an information transfer apparatus and an information transfer method for transferring information between computers connected to each other using a communication medium.

  A conventional information transfer apparatus will be described with reference to the drawings.

  FIG. 33 is a system configuration diagram of a conventional information transfer apparatus. As shown in FIG. 33, the conventional information transfer apparatus stores information from an information search client 101 that is a client computer that requests information, and an information storage server 102 that is a server computer that provides the information search client 101 with information. In response to an information search request, the information storage server 102 extracts the transfer information from the database 102 a according to an instruction from the information transfer means 103 and transfers it to the information search client 101 through the computer network 104.

  The conventional information transfer apparatus configured as described above transfers information without considering the loads of the computer network 104, the information search client 101, and the information storage server 102 at all.

  However, since the conventional information transfer apparatus transfers information without considering each load of the computer network 104, the information search client 101, or the information storage server 102, image information or the like particularly in a high load state. However, when transferring an extremely large amount of information, the information cannot be transferred, or it takes a long time to transfer the information.

  In view of such a current situation, the present invention can transfer information in a short time in a high load state, and can transfer high quality information in a low load state. The purpose is to do.

  The first information transfer apparatus according to the present invention is an information transfer means for transferring information by a plurality of computers connected to each other using a communication medium and increasing or decreasing the amount of information transferred according to the magnitude of the load. It has.

  According to the first information transfer apparatus, since the information transfer means for increasing or decreasing the amount of information transferred according to the size of the load is provided, the amount of information transferred is reduced in a high load state. Thus, the transfer time can be shortened, and information corresponding to the load can be added to the information to be transferred in a low load state.

  A second information transfer apparatus according to the present invention is connected to each other using a communication medium, and in a computer network composed of a server computer that stores and provides information and a client computer that requests information, the communication load of the communication medium is reduced. The communication load measuring means for measuring, the communication load calculating means for calculating the size of the communication load, and when the calculated communication load is larger than the predetermined load, the transfer schedule information scheduled to be transferred is changed to the communication load. Transfer information is created by reducing the amount of information accordingly, and when the calculated communication load is smaller than a predetermined load, transfer information is created by adding the information amount to the transfer schedule information according to the communication load. Information creation means, and information transfer means for transferring the transfer information created by the transfer information creation means to the client computer that requested the information are provided.

  According to the second information transfer device, the communication load of the communication medium is always measured, and when the calculated communication load is larger than the predetermined load, the amount of information corresponding to the communication load is reduced from the transfer schedule information. If the calculated communication load is smaller than the predetermined load, the transfer information is created by adding the amount of information corresponding to the communication load to the transfer schedule information, and the transfer information created on the client computer. Therefore, it is possible to reduce the amount of information to be transferred in a high load state to shorten the transfer time, and in a low load state, the information to be transferred depends on the load. Information can be added.

  In the second information transfer device, the communication load measuring means preferably measures the communication load using at least one of the number of packets flowing through the communication medium, the size of the packet, the number of collisions, and the line usage rate. .

  A third information transfer apparatus according to the present invention is a server or client computer system in a computer network comprising a server computer that stores and provides information and a client computer that requests information that are connected to each other using a communication medium. A system load measuring means for measuring the load, a system load calculating means for calculating the magnitude of the system load, and, if the calculated system load is larger than a predetermined load, the system from the transfer schedule information scheduled to be transferred Transfer information is created by reducing the amount of information according to the load, and if the calculated system load is smaller than the predetermined load, the transfer information is created by adding the amount of information to the transfer schedule information according to the system load. Transfer information generating means for transferring information to the client computer that requested the information And an information transfer means for transferring the transfer information created.

  According to the third information transfer apparatus, the system load of the server or the client computer is always measured, and when the calculated system load is larger than the predetermined load, the information amount corresponding to the communication load is calculated from the transfer schedule information. Reduced and created transfer information. If the calculated system load is smaller than the predetermined load, transfer information was created by adding the amount of information according to the system load to the transfer schedule information and created on the client computer. Since the transfer information is transferred, the amount of information to be transferred can be reduced in a high load state to shorten the transfer time, and in the low load state, the information to be transferred is loaded. Corresponding information can be added.

  In the third information transfer apparatus, the system load measuring means calculates the system load as a computer CPU usage rate, a disk I / O count, a page-in / out count, a swap-in / out count, a process count, a CPU cache hit rate, It is preferable to measure using at least one of a disk cache hit rate and a system bus data transfer amount.

  A fourth information transfer apparatus according to the present invention is connected to each other using a communication medium, and in a computer network composed of a server computer that stores and provides information and a client computer that requests information, a communication load of the communication medium, A load measuring means for measuring at least one of the system load of the server computer or the system load of the client computer and an information transfer request from the client computer are received, and the transfer is reserved using the received information as transfer reservation information. Information transfer reservation means and the amount of information that can be transferred are calculated from the load measured by the load measurement means, and when the amount of information that can be transferred is larger than the information amount of the transfer reservation information, the transfer start of transfer reservation information is instructed Client computer by load calculation means and transfer start instruction And an information transfer means for transferring the transfer reservation information.

  According to the fourth information transfer apparatus, at least one of the communication load of the communication medium, the system load of the server computer or the system load of the client computer is always measured, and a request for information transfer is received from the client computer. The information received is reserved as transfer reservation information, the amount of information that can be transferred is calculated from the measured load, and the transfer reservation information is transferred when the amount of information that can be transferred is larger than the information amount of the transfer reservation information. In order to instruct the start, the requested information is transferred to the client computer after a low load.

  A fifth information transfer apparatus according to the present invention is connected to each other using a communication medium, and in a computer network comprising a server computer that stores and provides information and a client computer that requests information, the client computer in the server computer Difference information creating means for creating difference information for adding information amount to information already transferred to the information, and measuring at least one of communication load of communication medium, system load of server computer or system load of client computer Load measuring means and load calculating means for calculating the transferable information amount from the load measured by the load measuring means and instructing the start of transfer of difference information when the transferable information amount is larger than the information amount of difference information In response to the transfer start instruction, And the difference information transfer means for transferring the minute information, and a differential information adding means for adding the difference information to the transferred information on the client computer.

  According to the fifth information transfer device, at least one of the communication load of the communication medium, the system load of the server computer, or the system load of the client computer is always measured and transferred to the client computer in the server computer. The difference information that adds the information amount to the information is created, the transferable information amount is calculated from the measured load, and the transfer of difference information is started when the transferable information amount is larger than the difference information amount The difference information, which is untransferred information among the requested information, is transferred to the client computer after a low load.

  A sixth information transfer apparatus according to the present invention is connected to each other using a communication medium, and is identical to a plurality of server computers in a computer network composed of a server computer that stores and provides information and a client computer that requests information. Information storage means for storing information on the content of the information, load measuring means for measuring each communication load of a communication medium between a client computer requesting information and a plurality of server computers, or each system load of at least a plurality of server computers, and a plurality of Among these server computers, load calculation means for instructing a server computer with a small load to start information transfer, and information transfer means for transferring information to a client computer in response to the transfer start instruction.

  According to the sixth information transfer apparatus, the same information is stored in a plurality of server computers, and the communication load of the communication medium between the client computer and the plurality of server computers or the system load of at least the plurality of server computers is reduced. Information is transferred from the low-load server computer of the plurality of server computers to the client computer in order to always measure and instruct the server computer having a low load among the plurality of server computers to start information transfer. become.

  In the fourth to sixth information transfer apparatuses, the load measuring means measures the communication load using at least one of the number of packets flowing through the communication medium, the size of the packet, the number of collisions, and the line usage rate. System load, computer CPU usage rate, Disk I / O count, page in / out count, swap in / out count, number of processes, CPU cache hit rate, disk cache hit rate, and system bus data transfer amount It is preferable to measure using at least one of them.

  In the first information transfer method according to the present invention, when a plurality of computers connected to each other using a communication medium transfer information, information that increases or decreases the amount of information to be transferred according to the magnitude of the load A transfer process is provided.

  According to the first information transfer method, since the information transfer process for increasing / decreasing the information amount of information to be transferred according to the size of the load is provided, the information amount of the information to be transferred is reduced in a high load state. Thus, the transfer time can be shortened, and information corresponding to the load can be added to the information to be transferred in a low load state.

  According to a second information transfer method of the present invention, in a computer network composed of a server computer that stores and provides information and a client computer that requests information, the communication load of the communication medium is reduced. A communication load measurement step for measuring, a communication load calculation step for calculating the size of the communication load, and if the calculated communication load is larger than a predetermined load, the transfer schedule information to be transferred is changed to the communication load. Transfer information is created by reducing the amount of information accordingly, and when the calculated communication load is smaller than a predetermined load, transfer information is created by adding the information amount to the transfer schedule information according to the communication load. An information creation step, and an information transfer step for transferring the transfer information created in the transfer information creation step to the client computer that requested the information. That.

  According to the second information transfer method, the communication load of the communication medium is always measured, and when the calculated communication load is larger than the predetermined load, the information amount corresponding to the communication load is reduced from the transfer schedule information. If the calculated communication load is smaller than the predetermined load, the transfer information is created by adding the amount of information corresponding to the communication load to the transfer schedule information, and the transfer information created on the client computer. Therefore, it is possible to reduce the amount of information to be transferred in a high load state to shorten the transfer time, and in a low load state, the information to be transferred depends on the load. Information can be added.

  In the second information transfer method, the communication load measuring step includes a step of measuring the communication load using at least one of the number of packets flowing through the communication medium, the size of the packet, the number of collisions, and the line usage rate. It is preferable.

  A third information transfer method according to the present invention is an information transfer method in a computer network which is connected to each other using a communication medium and includes a server computer that stores and provides information and a client computer that requests information. A system load measuring step for measuring the system load of the client computer, a system load calculating step for calculating the magnitude of the system load, and a transfer that is scheduled to be transferred if the calculated system load is greater than a predetermined load. Transfer information is created by reducing the information amount according to the system load from the schedule information, and if the calculated system load is smaller than the predetermined load, the information amount is added to the transfer schedule information according to the system load. The transfer information creation process for creating the transfer information and the client computer that requested the information And an information transfer step of transferring the transfer information created in the transfer information creation process.

  According to the third information transfer method, the system load of the server or the client computer is always measured, and when the calculated system load is larger than the predetermined load, the information amount corresponding to the communication load is calculated from the transfer schedule information. Reduced and created transfer information. If the calculated system load is smaller than the predetermined load, transfer information was created by adding the amount of information according to the system load to the transfer schedule information and created on the client computer. Since the transfer information is transferred, the amount of information to be transferred can be reduced in a high load state to shorten the transfer time, and in the low load state, the information to be transferred is loaded. Corresponding information can be added.

  In the third information transfer method, the system load measurement step includes the system load including the CPU usage rate of the computer, the number of disk I / Os, the number of page-in / out times, the number of swap-in / out times, the number of processes, the hit rate of the CPU cache, Preferably, the method includes a step of measuring using at least one of a disk cache hit rate and a system bus data transfer amount.

  A fourth information transfer method according to the present invention includes a communication load of a communication medium in a computer network that is connected to each other using a communication medium and includes a server computer that stores and provides information and a client computer that requests information. A load measuring step for measuring at least one of the system load of the server computer or the system load of the client computer, and a request for information transfer from the client computer, and a transfer reservation is made using the received information as transfer reservation information. The information transfer reservation process and the load transferable information amount are calculated from the load measured in the load measurement process, and when the transferable information volume is larger than the transfer reservation information transfer information, an instruction to start transfer of the transfer reservation information is given. Client computer based on load calculation process and transfer start instruction And an information transfer step of transferring the transfer reservation information.

  According to the fourth information transfer method, at least one of the communication load of the communication medium, the system load of the server computer or the system load of the client computer is always measured, and a request for information transfer is received from the client computer. The information received is reserved as transfer reservation information, the amount of information that can be transferred is calculated from the measured load, and the transfer reservation information is transferred when the amount of information that can be transferred is larger than the information amount of the transfer reservation information. In order to instruct the start, the requested information is transferred to the client computer after a low load.

  According to a fifth information transfer method of the present invention, a client computer in a server computer is connected to each other using a communication medium, and includes a server computer that stores and provides information and a client computer that requests information. And measuring at least one of a difference information creating step for creating difference information for adding information amount to information that has already been transferred, and a communication load of a communication medium, a system load of a server computer, or a system load of a client computer A load measurement step, and a load calculation step for calculating a transferable information amount from the load measured in the load measurement step and instructing the start of transfer of difference information when the transferable information amount is larger than the information amount of difference information In response to the transfer start instruction, the client computer And differential information transfer step of transferring the differential information, and a differential information adding step of adding the difference information to the transferred information on the client computer.

  According to the fifth information transfer method, at least one of the communication load of the communication medium, the system load of the server computer, or the system load of the client computer is always measured and transferred to the client computer in the server computer. The difference information that adds the information amount to the information is created, the transferable information amount is calculated from the measured load, and the transfer of difference information is started when the transferable information amount is larger than the difference information amount The difference information, which is untransferred information among the requested information, is transferred to the client computer after a low load.

  A sixth information transfer method according to the present invention is the same for a plurality of server computers in a computer network composed of a server computer that stores and provides information and a client computer that requests information that are connected to each other using a communication medium. An information accumulating step for accumulating information on the content of the information, a load measuring step for measuring each communication load of a communication medium between a client computer requesting information and a plurality of server computers, or each system load of at least a plurality of server computers, and a plurality of Among these server computers, there are provided a load calculation step for instructing a server computer with a small load to start information transfer, and an information transfer step for transferring information to the client computer in response to the transfer start instruction.

  According to the sixth information transfer method, the same information is stored in a plurality of server computers, and the communication load of the communication medium between the client computer and the plurality of server computers or the system load of at least the plurality of server computers is reduced. Information is transferred from the low-load server computer of the plurality of server computers to the client computer in order to always measure and instruct the server computer having a low load among the plurality of server computers to start information transfer. become.

  In the fourth to sixth information transfer methods, the load measuring step measures the communication load using at least one of the number of packets flowing through the communication medium, the size of the packet, the number of collisions, and the line usage rate. System load, computer CPU usage rate, Disk I / O count, page in / out count, swap in / out count, number of processes, CPU cache hit rate, disk cache hit rate, and system bus data transfer amount It is preferable to include a step of measuring using at least one of them.

  A computer-readable recording medium on which a first information transfer program according to the present invention is recorded is connected to each other using a communication medium, and is a computer network composed of a server computer that stores and provides information and a client computer that requests information. When the information transfer program in the work is recorded and the computer is used to measure the communication load of the communication medium, the communication load measuring means for calculating the size of the communication load, the calculated communication load is larger than the predetermined load The transfer information is created by reducing the amount of information according to the communication load from the transfer schedule information scheduled to be transferred, and if the calculated communication load is smaller than the predetermined load, the transfer schedule information is communicated. Transfer information creation means for creating transfer information by adding an amount of information according to the load, and the client that requested the information To function as an information transfer means for transferring the transfer information created in the transfer information creating means to the computer.

  In the computer-readable recording medium in which the first information transfer program is recorded, the communication load measuring means determines the communication load as at least one of the number of packets flowing through the communication medium, the size of the packet, the number of collisions, and the line usage rate. It is preferable to measure using one.

  A computer-readable recording medium recording the second information transfer program according to the present invention is connected to each other using a communication medium, and is a computer network comprising a server computer that stores and provides information and a client computer that requests information. An information transfer program in a work is recorded, a system load measuring means for measuring a system load of a server or a client computer, a system load calculating means for calculating the magnitude of the system load, and the calculated system load is more than a predetermined load If the system load is large, transfer information is created by reducing the amount of information according to the system load from the transfer schedule information scheduled for transfer, and if the calculated system load is smaller than the predetermined load, the transfer schedule information Information is added to the system load according to the system load. Transfer information generation means for generating and forwarding information created in the transfer information generating means to the client computer that requested the information to function as an information transfer means for transferring.

  In the computer-readable recording medium in which the second information transfer program is recorded, the system load measuring means determines the system load as the CPU usage rate of the computer, the number of disk I / Os, the number of page-in / out, the number of swap-in / out, It is preferable to measure using at least one of the number of processes, CPU cache hit rate, Disk cache hit rate, and system bus data transfer amount.

  A computer-readable recording medium on which a third information transfer program according to the present invention is recorded is connected to each other using a communication medium, and is a computer network composed of a server computer that stores and provides information and a client computer that requests information. An information transfer program in a work is recorded, and a load measuring means for measuring at least one of a communication load of a communication medium, a system load of a server computer or a system load of a client computer, and a request for information transfer from the client computer are recorded. Information transfer reservation means for making a transfer reservation using the received information as transfer reservation information, and calculating the amount of information that can be transferred from the load measured by the load measurement means. If it is larger than the amount of information Load calculating means for instructing the start of transfer of the reservation information, and to function as an information transfer means for transferring the transfer reservation information to the client computer by an instruction of the start transfer.

  A computer-readable recording medium on which a fourth information transfer program according to the present invention is recorded is connected to each other using a communication medium, and is a computer network comprising a server computer that stores and provides information and a client computer that requests information. An information transfer program in a work is recorded, and a computer, a difference information creating means for creating difference information for adding information amount to information transferred to a client computer in a server computer, a communication load of a communication medium, a server computer A load measuring means for measuring at least one of the system load or the system load of the client computer, the amount of information that can be transferred is calculated from the load measured by the load measuring means, and the amount of information that can be transferred is the information amount of the difference information If greater than Function as load calculation means for instructing start of transfer of minute information, difference information transfer means for transferring difference information to client computer in response to transfer start instruction, and difference information addition means for adding difference information to already transferred information of client computer Let

  A computer-readable recording medium on which a fifth information transfer program according to the present invention is recorded is connected to each other using a communication medium, and is a computer network comprising a server computer that stores and provides information and a client computer that requests information. An information transfer program in a work is recorded, the computer stores information storage means for storing information of the same content in a plurality of server computers, each communication load of a communication medium between a client computer requesting information and a plurality of server computers, or at least Load measuring means for measuring each system load of a plurality of server computers, load calculating means for instructing a server computer having a small load among the plurality of server computers to start information transfer, and a client computer by a transfer start instruction To function as an information transfer means for transferring the broadcast.

  In the computer-readable recording medium on which the third to fifth information transfer programs are recorded, the load measuring means calculates the communication load from the number of packets flowing through the communication medium, the size of the packet, the number of collisions, and the line usage rate. The system load is measured using at least one, and the system load is determined as the CPU usage rate of the computer, the number of disk I / Os, the number of page-in / out times, the number of swap-in / out times, the number of processes, the CPU cache hit rate, and the disk cache hit rate. It is preferable to measure using at least one of rate and system bus data transfer.

  According to the first information transfer apparatus or the first information transfer method according to the present invention, when the network system is in a high load state, the amount of information to be transferred is reduced and the transfer time is shortened. Therefore, necessary information can be obtained without causing a waiting time. In addition, since information corresponding to the load can be added to information to be transferred in a low load state, information for improving the quality of the information can be added.

  According to the second information transfer apparatus according to the present invention or the second information transfer method according to the present invention, when the communication load of the communication medium is high, the amount of information to be transferred is reduced and transferred. Since time can be shortened, necessary information can be obtained without causing a waiting time. In addition, since information corresponding to the load can be added to information to be transferred in a low load state, information for improving the quality of the information can be added.

  In the second information transfer apparatus or the second information transfer method, it is certain that at least one of the number of packets flowing through the communication medium, the size of the packet, the number of collisions, and the line usage rate is used for measuring the communication load. The communication load can be measured.

  According to the third information transfer apparatus or the third information transfer method of the present invention, when the system load of the computer is high, the amount of information to be transferred is reduced and the transfer time is reduced. Therefore, necessary information can be obtained without causing a waiting time. In addition, since information corresponding to the load can be added to information to be transferred in a low load state, information for improving the quality of the information can be added.

  In the third information transfer apparatus or the third information transfer method, the CPU load of the computer, the number of disk I / Os, the number of page-in / out, the number of swap-in / out, the number of processes, the CPU cache, The system load can be reliably measured by using at least one of the hit rate, the disk cache hit rate, and the data transfer amount of the system bus.

  According to the fourth information transfer apparatus according to the present invention or the fourth information transfer method according to the present invention, the requested information is transferred to the client computer after a low load. Can be transferred reliably.

  According to the fifth information transfer apparatus or the fifth information transfer method of the present invention, the difference information that is untransferred information among the requested information is transferred to the client computer after a low load. Therefore, since the difference information can be added to the information transferred previously, the quality of the information transferred earlier can be improved.

  According to the sixth information transfer apparatus according to the present invention or the sixth information transfer method according to the present invention, information is transferred from a low-load server computer among a plurality of server computers to the client computer. Desired information can be transferred with almost no waiting time.

  According to the fourth to sixth information transfer apparatuses or the fourth to sixth information transfer methods, the communication load is measured by measuring at least one of the number of packets flowing through the communication medium, the size of the packet, the number of collisions, and the line usage rate. In addition, the CPU load rate of the computer, the number of disk I / Os, the number of page-in / out times, the number of swap-in / out times, the number of processes, the CPU cache hit rate, the disk cache hit rate, If at least one of the data transfer amounts of the system bus is used, the communication load or the system load can be reliably measured.

  According to a computer-readable recording medium recording an information transfer program for causing a computer to implement any one of the information transfer methods according to the present invention, the information transfer program is executed by a computer connected to a network. The same effect as that of any one of the information transfer methods can be obtained.

The information assumed by the information transfer apparatus according to the present invention is a still image, a moving image, audio information, and the like. If the information is accumulated on a computer, the amount of data is at least a few Mbytes or more. Therefore, when transferring this information to a computer connected via a computer network, a data amount of several Mbytes or more is transferred, and a large load is placed on the computer that performs transmission and reception and the computer network that is the transfer path. For this reason, information cannot be transferred or it takes a long time to transfer. In addition, not only the server computer and client computer but also other resources are greatly affected, and other computers that perform transmission and reception and other jobs using the computer network may not be completed.
(First embodiment)
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.

  In this embodiment, when there is a request for information transfer from the client computer to the server computer, the load information stored in advance is used to calculate the communication load of the computer network as the communication medium as the transfer path, and the load Transfer information that can be transferred is newly created according to the request, and is transferred within a short time (time desired by the client).

  For example, when the communication load is large, if it is still image information, the number of pixels and the number of color expression colors that represent the information is reduced, if it is moving image information, the time component is reduced, or if it is audio information, the high frequency component is reduced. Transfer information in which the amount of information is reduced by reduction or the like is newly created and transferred within a desired time. In addition, when the communication load is small, addition of the number of pixels and the number of color expression colors for expressing the information if it is still image information, addition of a time component for moving image information, or high frequency component for audio information. Transfer information with an increased amount of information by addition or the like is newly created, and information with improved quality is transferred.

  FIG. 1 is a system configuration diagram of an information transfer apparatus according to the first embodiment of the present invention. As shown in FIG. 1, an information search client 11 that is a client computer that makes an information search request and an information storage server 12 that is a server computer that stores information and provides the information are connected to a LAN (local area network) as a communication medium. And the like via a computer network 13.

  The information transfer apparatus is connected to a computer network 13, and constantly measures the communication load of the computer network 13, and stores the measurement result in the communication load database 22 as communication load information and the information search client 11. Communication load calculation that extracts the past communication load information closest to the time point from the communication load database 22 when a search request is made to the information storage server 12, and calculates the amount of information that can be transferred according to the communication load information When the transfer schedule information extracted from the means 23 and the transfer schedule database 12a is larger than the amount of information that can be transferred, after the transfer information is generated by reducing the information amount according to the communication load from the transfer schedule information Stored in the transfer information database 12c and the transfer schedule information is smaller than the amount of information that can be transferred. First, transfer information is created by adding an amount of information to the transfer schedule information according to the communication load, and then transferred from the transfer information database 12c of the information storage server 12 and transferred from the transfer information database 12c stored in the transfer information database 12c. Information transfer means 24 for extracting information and transferring the transfer information to the information search client 11 is provided.

  Hereinafter, an information transfer method of the information transfer apparatus configured as described above will be described with reference to the drawings.

  First, as shown in the flow of the communication load measuring step in FIG. 2, the communication load measuring means 21 shown in FIG. 1 determines the number of packets for a certain period (for example, 1 second) flowing on the computer network 13 every minute and the number of packets. The size is measured, the amount of packets (packet amount = number of packets × size) is calculated, and registered in the term representing the packet amount in the communication load information table 22a shown in FIG. . Further, for example, the number of collisions occurring on the computer network 13 every minute for a certain period (for example, one minute) is measured and registered in the term representing the number of collisions in the communication load information table 22a together with the measurement time. Also, a load coefficient (for example, load coefficient = packet amount + number of collisions) is calculated from the packet amount and the number of collisions measured at the same time, and is registered in a term representing the load coefficient at the corresponding time in the communication load information table 22a. To do.

  The number of packets, the size thereof, and the number of collisions may be measured using an existing network monitoring tool or the like, and is not particularly limited. There are no particular limitations on the measurement interval and measurement period of the packet amount and the number of collisions.

  Further, when calculating the load coefficient, weighting may be performed for each item and then added. For example, a method of weighting either the packet amount or the number of collisions according to the state of communication, or reducing the weighting as it goes back in the past can be considered. Further, the line usage rate may be measured and used when calculating the load coefficient.

  Next, as shown in the flow of the communication load calculation step in FIG. 4, the communication load calculation means 23 shown in FIG. 1 performs the information search request to the information storage server 12 when the information search client 11 makes an information search request. Calculation of the communication load of the computer network 13 is started.

  That is, as shown in FIG. 5, the request time is extracted from the information search request format 50 which is a message received from the information storage server 12, and the information search client 11 searches from the measurement time of the communication load information table 22a shown in FIG. A record having a past time closest to the time at which the request was made is searched to extract a load coefficient. Thereafter, the transferable information amount per second from the load coefficient extracted using the transferable information amount calculation curve 51 as an index for calculating the information amount transferable per second according to the load coefficient shown in FIG. Ask for.

  The transferable information amount calculation curve 51 shown in FIG. 6 is obtained from the communication load information table 22a, for example, where the reference load coefficient is the reference coefficient L0 and the transferable information amount at the reference coefficient L0 is the reference information amount I0. When the extracted load coefficient is larger than the reference coefficient L0, the transferable information amount is smaller than the reference information amount I0, and when it is smaller than the reference coefficient L0, the transferable information amount is larger than the reference information amount I0. Is set to The transferable information amount calculation curve 51 is preferably adapted to the network environment, and may be created by measuring the transferable information amount while changing the load in the actual environment. The creation method is not particularly limited.

  Further, when extracting the load coefficient from the communication load information table 22a shown in FIG. 3, the average value may be calculated after weighting the load coefficient for a certain period in the past (for example, 10 minutes).

  Next, as shown in the flow of the transfer information creation process in FIG. 7, the transfer information creation unit 12 b shown in FIG. 1 stores information based on the transferable information amount per second obtained by the communication load calculation unit 23. Transfer information is created from the transfer schedule information 12a on the server 12 and stored in the transfer information database 12c.

  That is, the time limit is extracted from the information search request format 50 shown in FIG. 5, and the amount of transfer information that can be transferred within the time limit (transfer information amount = limit time × transferable information amount per second) is transferred per second. Calculate from the amount of possible information.

  When the calculated transfer information amount is smaller than the initial transfer information amount (transfer information amount <transfer schedule information amount), the transfer information amount is reduced to the transfer information amount and a new transfer is performed. Create information. Further, when the calculated transfer information amount is equal to or larger than the transfer schedule information amount (transfer information amount> = transfer schedule information amount), additional information is added to the information amount of the transfer schedule information until the transfer information amount is reached. Create new transfer information. Thereafter, the newly created transfer information is stored in the transfer information database 12c.

  The transfer information may be created by increasing / decreasing the number of pixels, increasing / decreasing high frequency components, increasing / decreasing color display colors, increasing / decreasing gray scale display colors, increasing / decreasing time axis components, etc., and is not particularly limited. If the calculated transfer information amount is equal to or larger than the transfer schedule information amount (transfer information amount> = transfer schedule information amount), the transfer schedule information can be used as transfer information without adding new information. Good.

  Next, as shown in the flow of the information transfer process in FIG. 8, the information transfer means 24 shown in FIG. 1 extracts the transfer information from the information storage server 12 and delivers the transfer information to the information search client 11.

  That is, the transfer information is extracted from the transfer information database 12c of the information storage server 12, and the request source address is extracted from the information search request format 50 shown in FIG. 5, and the information search indicated by the request source address is performed through the computer network 13. The transfer information created by the information storage server 12 is transferred to the client 11 and stored in the storage device of the information search client 11.

  The transfer method is not particularly limited as long as file transfer or the like provided normally is used.

  As described above, according to the present embodiment, according to the load on the computer network 13 at the time of a search request, when the communication load is large, it is possible to search for necessary information within a desired time by reducing the amount of information. At the same time, when the load is small, the information retrieval client 11 can be provided with higher quality information by adding the amount of information.

  The installation locations of the communication load measuring unit 21, the communication load database 22, the communication load calculating unit 23, the transfer information creating unit 12b, the transfer information database 12c, and the information transfer unit 24 are all limited to the present embodiment. Instead, it may be provided on a computer accessible via a network.

  A computer as an information transfer apparatus for realizing the information transfer method according to the present embodiment includes a CPU, a main storage device, an auxiliary storage device such as a magnetic disk device and an optical disk device, an input / output device serving as a man-machine interface, Any configuration including a data line terminator such as a modem may be used.

  Therefore, if an information transfer program for realizing the information transfer method according to the present embodiment is created and the information transfer program is recorded on a computer-readable recording medium, the recording medium is stored in the auxiliary storage of the computer. When the information transfer program according to the present embodiment is loaded into the main storage device of the computer and a predetermined operation timing (= event) occurs when the information transfer program according to the present embodiment is loaded, the CPU of the computer performs a predetermined function of each unit. Is executed.

A computer that realizes the information transfer device according to each embodiment described below has the same configuration as the computer that realizes the information transfer device according to this embodiment.
(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, when there is a request for information transfer from the client computer to the server computer, the system load of the computer that performs transmission / reception is calculated using the load information stored in advance, and transfer is possible according to the load. Transfer information is newly created and transferred within a short time (time desired by the client).

  For example, when the system load is large, if it is still image information, the number of pixels representing the information, the number of color expression colors, etc. are reduced, if it is moving image information, the time component is reduced or if it is audio information, the high frequency component is reduced. Transfer information in which the amount of information is reduced by reduction or the like is newly created and transferred within a desired time. In addition, when the system load is small, addition of the number of pixels representing the information, the number of color expression colors, etc. for still image information, addition of a time component for moving image information, or high frequency component for audio information Transfer information with an increased amount of information by addition or the like is newly created, and information with improved quality is transferred.

  FIG. 9 is a system configuration diagram of an information transfer apparatus according to the second embodiment of the present invention. As shown in FIG. 9, a computer network such as a LAN as a communication medium includes an information search client 11 that is a client computer that makes a search request for information and an information storage server 12 that is a server computer that stores information and provides the information. 13 is connected.

  This information transfer apparatus is connected to the information retrieval client 11 and the information storage server 12, and always measures the system load of both computers 11 and 12, and stores the measurement result as system load information in the system load database 26. 25, when the information search client 11 requests a search request from the information storage server 12, the past system load information closest to that point in time is extracted from the system load database 26 and can be transferred according to the system load information. When the system load calculation means 27 for calculating the information amount and the transfer schedule information extracted from the transfer schedule database 12a are larger than the transferable information amount, the information amount is reduced according to the system load from the transfer schedule information. Transfer information is created and stored in the transfer information database 12c. If the transfer schedule information is smaller than the amount of information that can be transferred, transfer information is created by adding the information amount to the transfer schedule information according to the system load, and then creating transfer information to be stored in the transfer information database 12c. Means 12 b and information transfer means 24 for extracting the transfer information from the transfer information database 12 c of the information storage server 12 and transferring the transfer information to the information search client 11.

  Hereinafter, an information transfer method of the information transfer apparatus configured as described above will be described with reference to the drawings.

  First, as shown in the flow of the system load measurement process in FIG. 10, the system load measurement means 25 shown in FIG. 9 includes the information storage server 12 and the information search client 11 for a certain period (for example, 1 second) every minute, for example. The system load is measured, and the CPU usage rate, the number of Disk I / Os, and the page-in / out of the corresponding items of the server load information table 26a shown in FIG. 11 and the client load information table 26b shown in FIG. The number of times is registered together with the measurement time. Also, a load coefficient (for example, = CPU usage rate + Disk I / O count + page in / out count) is calculated from the CPU usage rate, Disk I / O count and page in / out count measured at the same time, and server load information is obtained. The calculated load coefficient is registered in the term representing the load coefficient at the corresponding time in the table 26a and the client load information table 26b.

  The CPU usage rate, Disk I / O count, or page-in / out count may be measured using an existing system monitoring tool or the like, and the measurement method is not particularly limited. The measurement interval and measurement period of the CPU usage rate, Disk I / O count, or page-in / out count are not particularly limited. Further, when calculating the load coefficient, weighting may be performed for each item and then added. For example, a method of weighting any one of the CPU usage rate, the Disk I / O count, and the page-in / out count according to the communication state, or reducing the weight of the same item as going back in the past can be considered.

  Alternatively, the number of swap-in / out, the number of processes, the hit rate of the CPU cache, the hit rate of the Disk cache, or the data transfer amount of the system bus may be measured and used when calculating the load coefficient.

  Next, as shown in the system load calculation process flow of FIG. 13, the system load calculation means 27 shown in FIG. 9 performs the information search request to the information storage server 12 by the information search client 11. Calculation of each system load of the information storage server 12 and the information retrieval client 11 is started.

  That is, the request time is extracted from the information search request format 50 which is a message received from the information storage server 12 shown in FIG. 5, and each of the server load information table 26a shown in FIG. 11 and the client load information table 26b shown in FIG. A record having a past time closest to the time at which the information retrieval client 11 requested the retrieval from the measurement time is retrieved to extract the load coefficient. Thereafter, the transferable information amount per second from the load coefficient extracted using the transferable information amount calculation curve 51 as an index for calculating the transferable information amount per second according to the load coefficient shown in FIG. Ask for.

  The transferable information amount calculation curve 51 is preferably adapted to the system environment, and may be created by measuring the transferable information amount while changing the load in the actual environment. The production method is not particularly limited.

  Further, when each load coefficient is extracted from the server load information table 26a shown in FIG. 11 and the client load information table 26b shown in FIG. 12, each item in each table 26a, 26b in a past fixed period (for example, 10 minutes). The average value of the load coefficient may be calculated after weighting. Furthermore, when calculating the average value of each load coefficient of the information storage server 12 and the information search client 11, the average value may be calculated after weighting each load coefficient.

  The transfer information creation unit 12b and the information transfer unit 24 illustrated in FIG. 9 perform the same operations as the corresponding units in the first embodiment, and thus description thereof is omitted.

  As described above, according to the present embodiment, in accordance with each system load of the information storage server 12 and the information search client 11 at the time of a search request, when the system load is large, the amount of information is reduced within a desired time. Necessary information can be searched, and when the system load is small, higher quality information can be provided to the information search client 11 by adding an information amount.

The installation locations of the system load measurement unit 25, the system load database 26, the system load calculation unit 27, the transfer information creation unit 12b, the transfer information database 12c, and the information transfer unit 24 are all limited to this embodiment. Instead, it may be provided on a computer accessible via a network.
(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described based on the drawings.

  In this embodiment, the load information that is constantly measured and accumulated is used to calculate the system load of the computer that performs transmission and reception and the communication load of the computer network that is the transfer path, and the requested information is transferred only when the load is small. The information is transferred when the load actually decreases.

  In other words, the information is transferred when the system load or the communication load is reduced and the transfer becomes possible within a desired time.

  FIG. 14 is a system configuration diagram of an information transfer apparatus according to the third embodiment of the present invention. As shown in FIG. 14, a computer network such as a LAN as a communication medium includes an information search client 11 that is a client computer that makes a search request for information and an information storage server 12 that is a server computer that stores information and provides the information. 13 is connected.

  The information transfer apparatus is connected to the computer network 13, the information retrieval client 11, and the information storage server 12, and always measures the communication load of the computer network 13 and the system load of both computers 11 and 12, and measures them in the load database 29. Load measurement means 28 for accumulating results as load information, and when the information retrieval client 11 requests a retrieval request from the information accumulation server 12, the past load information closest to that point is extracted from the load database 29, and the load information The amount of information that can be transferred is calculated according to the information, and if the transfer reservation information extracted from the transfer reservation database 12d is larger than the amount of information that can be transferred, the information transfer is suspended, and the transfer reservation information Is smaller than the amount of information that can be transferred, the information transfer means 24 The load calculation means 31 for instructing the start of transmission, the transfer information received from the transfer information database 12c of the information storage server 12 in response to the start instruction from the load calculation means 31 is extracted, and the transfer information is sent to the information search client 11 And an information transfer means 24 for transferring.

  Hereinafter, an information transfer method of the information transfer apparatus configured as described above will be described with reference to the drawings.

  First, as shown in the flow of the load measuring step in FIG. 15, the load measuring means 28 shown in FIG. 14 has, for example, the number of packets flowing over the computer network 13 every one minute (for example, 1 second) and the size thereof. The packet amount (packet amount = number of packets × size) is calculated, and registered in the term representing the packet amount in the communication load information table 29a shown in FIG. Also, for example, the number of collisions occurring on the computer network 13 every minute is measured for a certain period (for example, 1 minute), and registered in the term representing the number of collisions in the communication load information table 29a together with the measurement time. Further, a load coefficient (for example, load coefficient = packet amount + number of collisions) is calculated from the packet amount and the number of collisions measured at the same time, and is registered in a section representing the load coefficient at the corresponding time in the communication load information table 29a. To do.

  The number of packets, the size thereof, and the number of collisions may be measured using an existing network monitoring tool or the like, and is not particularly limited. There are no particular limitations on the measurement interval and measurement period of the packet amount and the number of collisions.

  In addition, when calculating the load coefficient, each item may be weighted and then added. For example, a method of weighting either the packet amount or the number of collisions according to the state of communication or reducing the weight as going back in the past can be considered. Further, the line usage rate may be measured and used when calculating the load coefficient.

  Further, the load measuring unit 28 measures the system load of the information storage server 12 and the information retrieval client 11 for a certain period (for example, 1 second) every minute, and the server load information table shown in FIG. 29b and the corresponding items of the client load information table 29c shown in FIG. Further, a load factor (for example, load factor = CPU usage rate + Disk I / O count + page in / out count) is calculated from the CPU usage rate, Disk I / O count and page in / out count measured at the same time, and the server The calculated load coefficients are respectively registered in the terms representing the load coefficients at the corresponding times in the load information table 29b and the client load information table 29c.

  The CPU usage rate, Disk I / O count, or page-in / out count may be measured using an existing system monitoring tool or the like, and the measurement method is not particularly limited. The measurement interval and measurement period of the CPU usage rate, Disk I / O count, or page-in / out count are not particularly limited. In addition, when calculating the load coefficient, each item may be weighted and then added. For example, a method of weighting any one of the CPU usage rate, the Disk I / O count, and the page-in / out count according to the communication state, or reducing the weight of the same item as going back in the past can be considered.

  Alternatively, the number of swap-in / out, the number of processes, the hit rate of the CPU cache, the hit rate of the Disk cache, or the data transfer amount of the system bus may be measured and used when calculating the load coefficient.

  Next, as shown in the flow of the information transfer reservation process in FIG. 16, the information transfer reservation means 30 shown in FIG. 14 transfers the information search client 11 to the information storage server 12 at the same time as the information search request. In the information transfer reservation table 120d shown in FIG. 17 in the reservation database 12d, a request source address that is an address of the information search client 11, an information ID for identifying information, and a time limit indicating an allowable range of required transfer time are registered. . Further, the information amount of the information is detected from the information ID and registered in the corresponding information amount item of the information transfer reservation table 120d.

  Next, as shown in the flow of the load calculation step in FIG. 18, the load calculation means 31 shown in FIG. 14 is, for example, 1 when the information search client 11 makes an information search request to the information storage server 12. The communication load of the computer network 13 and the system loads of the information storage server 12 and the information search client 11 are calculated every minute.

  That is, the number of records in the information transfer reservation table 120d shown in FIG. 17 in the transfer reservation database 12d is searched every minute, and if there are any registered records, the amount of reserved information is extracted. In addition, records having past times closest to the current time from the respective measurement times in the communication load information table 29a shown in FIG. 3, the server load information table 29b shown in FIG. 11, and the client load information table 29c shown in FIG. A load coefficient is extracted by searching, and a total load coefficient is calculated by, for example, obtaining an average value. Next, after obtaining the transferable information amount per second from the new load coefficient calculated using the transferable information amount calculation curve 51 shown in FIG. 6, the information transfer reservation table 120d shown in FIG. Then, the time limit of the corresponding information is extracted, and the transferable information amount is calculated by multiplying the transferable information amount per second by the time limit. Next, if the information amount of the reserved information is smaller than the transferable information amount (transfer reservation information amount <transferable information amount), the information transfer unit 24 is instructed to start transferring the reserved information. , The corresponding reservation information record is deleted from the information transfer reservation table 120d.

  It should be noted that the transferable information amount calculation curve 51 is preferably adapted to the network and system environment, and may be created by measuring the transferable information amount while changing the load in the actual environment, but the creation method is not particularly limited. .

  In addition, when each load coefficient is extracted from the communication load information table 29a, the server load information table 29b, and the client load information table 29c, weighting is performed for each item in each table for a certain past period (for example, 10 minutes). The average value of the load coefficient may be calculated from Further, when the average value is calculated from the three load coefficients of the communication load, the server load, and the client load, the average value may be calculated after weighting the load coefficient for each table.

  Next, as shown in the flow of the information transfer process in FIG. 19, when the information transfer means 24 shown in FIG. 14 receives an instruction to start transfer from the load calculation means 31, the information transfer means 24 from the transfer information database 12 c of the information storage server 12. The corresponding transfer information is extracted, and the transfer information is transferred to the information retrieval client 11 through the computer network 13.

  The transfer method is not particularly limited as long as file transfer or the like provided normally is used.

  As described above, according to the present embodiment, since the load states of the computer network 13, the server, and the client computers 12 and 11 are constantly measured, information desired from the information storage server when the total load is reduced. Can be obtained.

  In the present embodiment, all loads on the computer network 13, the server, and the client computers 12 and 11 are measured, but any one or two of them may be measured.

Further, the installation locations of the load measuring unit 28, the load database 29, the information transfer reservation unit 30, the load calculation unit 31, the transfer reservation database 12d, and the information transfer unit 24 are not limited to the present embodiment. It may be provided on a computer that can be accessed through a network.
(Fourth embodiment)
The present embodiment is a computer system that performs transmission / reception by using load information that is always measured and stored with respect to transferred information that has been transferred with a reduced amount of information when the system load or communication load is high. Calculate the communication load of the computer network that is the load or the transfer path, and transfer the difference information of the created information that has been created and add it to the previous information when the load decreases. Increase quality.

  For example, when the load becomes smaller than the average value for the past month, if it is still image information, the number of pixels and the number of color expression colors that express information are added, and if it is moving image information, a time component is added If it is audio information, the difference information prepared for adding high-frequency components is transferred and added to the transferred information.

  FIG. 20 is a system configuration diagram of an information transfer apparatus according to the fourth embodiment of the present invention. As shown in FIG. 20, an information search client 11 that is a client computer that makes an information search request and an information storage server 12 that is a server computer that stores information and provides the information are a computer network such as a LAN as a communication medium. 13 is connected.

  The information transfer apparatus is connected to the computer network 13, the information retrieval client 11, and the information storage server 12, and always measures the communication load of the computer network 13 and the system load of both computers 11 and 12, and measures them in the load database 29. The load measuring means 28 for accumulating the result as load information, and the difference information for adding the information amount to the information already transferred from the information accumulation server 12 to the information search client 11 are created and accumulated in the server side difference information database 12f. The difference information creating means 12e and the server side difference information database 12f are searched at a constant cycle, and if there is a record of difference information, the past load information closest to that point in time is extracted from the load database 29, and the load information is extracted. The amount of information that can be transferred is calculated according to the If the difference information extracted from the side difference information database 12f is larger than the amount of information that can be transferred, the difference information is suspended, and if the difference information is smaller than the amount of information that can be transferred, the difference A load calculating unit 31 for instructing the information transfer unit 32 to start transferring information, and receiving the start instruction from the load calculating unit 31 to extract the corresponding difference information from the server side difference information database 12f of the information storage server 12; Difference information transfer means 32 for transferring difference information to the search client 11 is provided. Further, the information search client 11 extracts the transferred difference information from the client-side difference information database 11c, extracts the transfer information previously transferred from the database 11a, and adds the difference information to the transfer information. Difference information adding means 11b is provided.

  Hereinafter, an information transfer method of the information transfer apparatus configured as described above will be described with reference to the drawings.

  First, the load measuring means 28 shown in FIG. 20 always measures the communication load of the computer network 13 and the system loads of the information storage server 12 and the information search client 11. Since the details of the operation are the same as those of the load measuring means 28 of the third embodiment, description thereof will be omitted.

  Next, as shown in the flow of the difference information creation process in FIG. 21, the difference information creation unit 12 e shown in FIG. 20 stores the difference information for loading the information amount of the transfer information transferred to the information search client 11 previously. create.

  That is, when the information storage server 12 transfers information with a reduced amount of information because the communication load of the computer network 13 and the system load of the information storage server 12 or the information search client 11 are large, the transfer information is transferred to the information search client 11. Information for increasing the amount of information stored in the server side difference information database 12f of the information storage server 12 and requesting information in each item of the difference information management table 120f shown in FIG. A request source address that is an address of the client 11, an information ID for identifying information, and a difference information ID for identifying difference information are registered.

  The difference information may be created so as to increase the number of pixels, increase the high frequency component, increase the color display color, increase the gray scale display color, increase the time axis component, and the like, and is not particularly limited. Also, the difference information is created at the same time as the information transfer, but there is no particular limitation, and the difference information may be created at any time.

  Next, as shown in the flow of the load calculation step of FIG. 23, the load calculation means 31 shown in FIG. 20 is shown in the communication load information table 29a shown in FIG. 3, the server load information table 29b shown in FIG. From each measurement time of the client load information table 29c, for example, each record having a past time closest to the current time is searched for every minute, each load coefficient is extracted, and an average value of each load coefficient is obtained. A new load factor is calculated. Using the transferable information amount calculation curve 51 shown in FIG. 6, the transferable information amount per second is obtained from the new load coefficient. Next, if the obtained transferable information amount is larger than a specific value (for example, average value) in a past specific period (for example, one month), the difference information management table shown in FIG. 22 in the server-side difference information database 12f. The difference management information registered in 120f is extracted, and a transfer start instruction is sent to the difference information transfer means 32 so as to start the transfer of difference information to the information search client 11 indicated by the request source address.

  It should be noted that the transferable information amount calculation curve 51 preferably matches the network and system environment, and may be created by measuring the transferable information amount while changing the load in the actual environment. The method for creating the curve 51 is not particularly limited.

  Further, when each load coefficient is extracted from the communication load information table 29a shown in FIG. 3, the server load information table 29b shown in FIG. 11, and the client load information table 29c shown in FIG. 12, the past in each table 29a, 29b, 29c. The average value may be calculated after weighting each load coefficient for a certain period (for example, 10 minutes). Further, when calculating the average value from the three load coefficients, the average value may be calculated after weighting the load coefficient for each table 29a, 29b, 29c.

  Next, as shown in the flow of the difference information transfer step in FIG. 24, the difference information transfer unit 32 shown in FIG. 20 receives the transfer start instruction from the load calculation unit 31 and receives the information search client 11 from the information storage server 12. Deliver the difference information.

  That is, when receiving a difference information transfer instruction from the load calculation means 31, the corresponding difference information is extracted from the server side difference information database 12 f of the information storage server 12 and transferred to the information search client 11 through the computer network 13. To do.

  The transfer method is not particularly limited as long as file transfer or the like provided normally is used.

  Next, as shown in the flow of the difference information adding step in FIG. 25, the difference information adding means 11 b shown in FIG. 20 includes the previous transfer information and client side difference information stored in the transfer information database 11 a of the information search client 11. The difference information stored in the database 11c is extracted using the difference information ID, and the difference information is added to the previous transfer information, thereby creating higher quality information.

  As described above, according to the present embodiment, the difference information is extracted from the information storage server 12 when the load on any one of the computer network 13, the information storage server 12, and the information search client 11 is small. Since the difference information is added, the quality of information can be improved.

  In the present embodiment, all loads on the computer network 13, the server, and the client computers 12 and 11 are measured, but any one or two of them may be measured.

Also, the installation locations of the client side difference information database 11c, the difference information creation means 12e, the server side difference information database 12f, the load measurement means 28, the load database 29, the load calculation means 31, and the difference information transfer means 32 are all implemented in this embodiment. It is not limited to the form, and may be provided on a computer accessible through a network.
(Fifth embodiment)
In this embodiment, the same information is stored in advance in a plurality of server computers, and when there is a request for transferring information from the client computer to the server computer, the load information that is always measured and stored is used. The system load of a plurality of server computers that can perform transmission or the communication load of a computer network that is a transfer path is calculated, and desired information is transferred from the server computer having the smallest load to the client computer.

  FIG. 26 is a system configuration diagram of an information transfer apparatus according to the fifth embodiment of the present invention. As shown in FIG. 26, a computer network such as a LAN as a communication medium includes an information search client 11 that is a client computer that makes a search request for information and an information storage server 12 that is a server computer that stores information and provides the information. 13 is connected.

  This information transfer apparatus includes an information storage means 33 for storing the same transfer information in the first information storage server 2A and the second information storage server 2B, the computer network 13, the first information storage server 2A and the second information storage server 2B. A load measuring unit 34 connected to the information storage server 2B, constantly measuring the communication load of the computer network 13 and the system load of both server computers 2A and 2B, and storing the measurement results in the load database 35 as load information; The load database 35 is polled at a period of time, the past load information closest to the time when the request for information is received is extracted from the load database 35, the amount of information that can be transferred is calculated according to the load information, and Information transfer means 3 so as to transfer information stored in a server having a small load and a large amount of information that can be transferred. And corresponding load information is extracted from the database of either the first information storage server 2A or the second information storage server 2B that has received the transfer start instruction. And an information transfer means 37 for transferring the transfer information to the information search client 11.

  Hereinafter, an information transfer method of the information transfer apparatus configured as described above will be described with reference to the drawings.

  First, as shown in the flow of the information storage process of FIG. 27, the information storage means 33 shown in FIG. 26 stores the same transfer information in the first information storage server 2A and the second information storage server 2B. Note that transfer information accumulation is not limited to two servers, and may be performed on three or more servers.

  Next, as shown in the flow of the load measurement step in FIG. 28, the load measurement means 34 shown in FIG. 26 includes the communication load of the computer network 13, each of the first information storage server 2A and the second information storage server 2B. Measure and accumulate each system load.

  That is, for example, the number of packets and the size of a certain period (for example, 1 second) flowing through the computer network 13 between the first information storage server 2A and the information search client 11 are measured every minute, and the packet amount (packet amount = packet amount = The number of packets × size) is calculated, and the calculated packet amount is registered together with the target server and the measurement time in the term representing the packet amount in the communication load information table 35a shown in FIG. Also, for example, the number of collisions occurring in the network every minute for a certain period (for example, 1 minute) is measured, and the number of collisions is registered in the term representing the number of collisions in the communication load information table 35a together with the target server and measurement time. To do. Further, a load factor (for example, load factor = packet amount + number of collisions) is calculated from the packet amount and the number of collisions measured at the same time, and is registered in the term representing the load factor at the corresponding time in the communication load information table 35a. To do.

  Similarly, the number of packets flowing through the computer network 13 between the second information storage server 2B and the information search client 11, the size and the number of collisions are measured, the load coefficient is calculated, and the communication load information shown in FIG. Register in the table 35a.

  Note that the number of packets, the size thereof, and the number of collisions may be measured using an existing network monitoring tool or the like, and the measurement method is not particularly limited. The measurement interval and measurement period of the packet amount and the number of collisions are not particularly limited.

  Also, when calculating the load coefficient, it may be added after weighting each item, or the line usage rate may be measured and used when calculating the load coefficient.

  Further, for example, the system load of the first information storage server 2A and the second information storage server 2B for a certain period (for example, 1 second) is measured every minute, and the server load information shown in FIG. Each CPU usage rate, each Disk I / O count, and each page-in / out count are registered together with the target server and measurement time in the corresponding item of the table 35b. After that, each load coefficient (for example, = CPU usage rate + Disk I / O count + page in / out count) is calculated from the CPU usage rate, Disk I / O count and page in / out count measured at the same time, and the server load is calculated. The information table 35b is registered in the item representing the load coefficient at the corresponding time.

  Note that the CPU usage rate, Disk I / O count, and page-in / out count may be measured using an existing system monitoring tool, and the measurement method is not particularly limited. The measurement interval and measurement period of the CPU usage rate, Disk I / O count, and page-in / out count are not particularly limited.

  Also, when calculating the load coefficient, it may be added after weighting each item, and the number of swap-in / out, the number of processes, CPU cache hit rate, disk cache hit rate, or system bus data transfer amount is measured. However, it may be used when calculating the load coefficient.

  Next, as shown in the flow of the load calculation process of FIG. 31, the load calculation means 36 shown in FIG. 26 is a computer at the time when the information search client 11 requests the information storage servers 2A and 2B to search for information. The communication load of the network 13 and each system load of the first information storage server 2A and the second information storage server 2B are calculated.

  That is, the request time is extracted from the information search request format 50, which is a message for requesting information search shown in FIG. 5, and each of the measurement times of the communication load information table 35a shown in FIG. 29 and the server load information table 35b shown in FIG. Among them, a record having a past time closest to the time at which the information search client 11 made a search request is searched to extract two load coefficients of a communication load and a server load, and a new value is obtained by obtaining an average value thereof. Calculate the load factor. The transferable information amount per second is obtained from the newly calculated load coefficient using the transferable information amount calculation curve 51 shown in FIG. This process is performed for each target server to determine the amount of information that can be transferred per second for each server, and the amount of information that can be transferred per second for each server is compared. From this, it is determined that information transfer is to be performed, and an instruction to start transfer is sent to the information transfer means 37.

  It should be noted that the transferable information amount calculation curve 51 preferably matches the network and system environment, and may be created by measuring the amount of information that can be transferred while changing the load in the actual environment. The method for creating the calculation curve 51 is not particularly limited.

  Further, when each load coefficient is extracted from the communication load information table 35a shown in FIG. 29 and the server load information table 35b shown in FIG. 30, the load coefficient in each table 35a, 35b for a past fixed period (for example, 10 minutes) is used. The average value may be calculated after weighting, and when calculating the average value from the two load coefficients, the average value is calculated after weighting the load coefficient for each table 35a, 35b. Also good.

  Next, as shown in the flow of the information transfer process in FIG. 32, as shown in FIG. 26, the information transfer means 37 receives a transfer start instruction from the load calculation means 36, and receives the first information storage server through the computer network 13. The transfer information is transferred from the designated server of 2A or the second information storage server 2B to the information search client 11, and the transfer information is stored in the database of the information search client 11.

  Note that the transfer method is not particularly limited as long as file transfer provided normally is used.

  As described above, according to the present embodiment, the information search client desires to have a plurality of information storage servers having the same information, and to receive information from the information storage server having a smaller computer network and server load. Information can be obtained in a time close to the time limit.

  Note that the installation locations of the information storage means 33, load measurement means 34, load database 35, load calculation means 36, and information transfer means 37 are not limited to the present embodiment, and are on a computer accessible via a network. If it is provided in.

1 is a system configuration diagram of an information transfer apparatus according to a first embodiment of the present invention. It is a flowchart figure which shows the communication load measurement process of the information transfer method which concerns on the 1st Embodiment of this invention. It is a format figure which shows the communication load information table of the information transfer method which concerns on 1st, 3rd, 4th embodiment of this invention. It is a flowchart figure which shows the communication load calculation process of the information transfer method which concerns on the 1st Embodiment of this invention. It is a format figure which shows the information search request format of the information transfer method which concerns on the 1st-5th embodiment of this invention. It is a graph which shows the transferable information amount calculation curve per second of the information transfer method according to each of the first to fifth embodiments of the present invention. It is a flowchart figure which shows the transfer information creation process of the information transfer method which concerns on the 1st Embodiment of this invention. It is a flowchart figure which shows the information transfer process of the information transfer method which concerns on the 1st Embodiment of this invention. It is a system configuration | structure figure of the information transfer apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart figure which shows the system load measurement process of the information transfer method which concerns on the 2nd Embodiment of this invention. It is a format figure which shows the server load information table of the information transfer method which concerns on the 2nd-4th embodiment of this invention. It is a format figure which shows the client load information table of the information transfer method which concerns on the 2nd-4th embodiment of this invention. It is a flowchart figure which shows the system load calculation process of the information transfer method which concerns on the 2nd Embodiment of this invention. It is a system configuration | structure figure of the information transfer apparatus which concerns on the 3rd Embodiment of this invention. It is a flowchart figure which shows the load measurement process of the information transfer method which concerns on the 3rd Embodiment of this invention. It is a flowchart figure which shows the information transfer reservation process of the information transfer method which concerns on the 3rd Embodiment of this invention. It is a format figure which shows the information transfer reservation table of the information transfer method which concerns on the 3rd Embodiment of this invention. It is a flowchart figure which shows the load calculation process of the information transfer method which concerns on the 3rd Embodiment of this invention. It is a flowchart figure which shows the information transfer process of the information transfer method which concerns on the 3rd Embodiment of this invention. It is a system configuration | structure figure of the information transfer apparatus which concerns on the 4th Embodiment of this invention. It is a flowchart figure which shows the difference information creation process of the information transfer method which concerns on the 4th Embodiment of this invention. It is a format figure which shows the difference information management table of the information transfer method which concerns on the 4th Embodiment of this invention. It is a flowchart figure which shows the load calculation process of the information transfer method which concerns on the 4th Embodiment of this invention. It is a flowchart figure which shows the difference information transfer process of the information transfer method which concerns on the 4th Embodiment of this invention. It is a flowchart figure which shows the difference information addition process of the information transfer method which concerns on the 4th Embodiment of this invention. It is a system configuration | structure figure of the information transfer apparatus which concerns on the 5th Embodiment of this invention. It is a flowchart figure which shows the information storage process of the information transfer method which concerns on the 5th Embodiment of this invention. It is a flowchart figure which shows the load measurement process of the information transfer method which concerns on the 5th Embodiment of this invention. It is a format figure which shows the communication load information table of the information transfer method which concerns on the 5th Embodiment of this invention. It is a format figure which shows the server load information table of the information transfer method which concerns on the 5th Embodiment of this invention. It is a flowchart figure which shows the load calculation process of the information transfer method which concerns on the 5th Embodiment of this invention. It is a flowchart figure which shows the information transfer process of the information transfer method which concerns on the 5th Embodiment of this invention. It is a system configuration | structure figure of the conventional information transfer apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Information search client 11a Transfer information database 11b Difference information load means 11c Server side difference information database 12 Information storage server 12a Transfer scheduled database 12b Transfer information creation means 12c Transfer information database 12d Transfer reservation database 120d Information transfer reservation table 12e Difference information creation means 12f server side difference information database 120f difference information management table 13 computer network 21 communication load measurement means 22 communication load database 22a communication load information table 23 communication load calculation means 24 information transfer means 25 system load measurement means 26 system load database 26a server load information Table 26b Client load information table 27 System load calculation means 28 Load measurement means 29 Load Database 29a Communication load information table 29b Server load information table 29c Client load information table 30 Information transfer reservation means 31 Load calculation means 32 Differential information transfer means 33 Information storage means 34 Load measurement means 35 Load database 35a Communication load information table 35b Server load information Table 36 Load calculation means 37 Information transfer means 50 Information search request format 51 Transferable information amount calculation curve per second

Claims (6)

An information transfer apparatus in a computer network, which is connected to each other using a communication medium and includes a server computer that stores and provides information and a client computer that requests the information,
Oite to the server computer, and the difference information generation means for generating difference information which pressurized attached to the transferred information to the client computer,
Load measuring means for measuring at least one of a communication load of the communication medium, a system load of the server computer, or a system load of the client computer;
Based on the measured load by the load measuring means, wherein the calculating the amount of information that can be transferred to the client computer from the server computer, the difference when the transportable information amount is larger than the information amount of the difference information Load calculating means for instructing the start of information transfer;
Difference information transfer means for transferring the difference information to the client computer in response to the transfer start instruction;
An information transfer apparatus comprising: difference information adding means for adding the difference information to the transferred information of the client computer. The load measuring means includes
Measuring the communication load using at least one of the number of packets flowing through the communication medium, the size of the packet, the number of collisions, and the line usage rate;
The system load includes the CPU usage rate of the computer, the number of disk I / Os, the number of page-in / out times, the number of swap-in / out times, the number of processes, the hit rate of the CPU cache, the hit rate of the disk cache, and the data transfer amount of the system bus The information transfer apparatus according to claim 1, wherein measurement is performed using at least one of the information. An information transfer method in a computer network, which is connected to each other using a communication medium and includes a server computer that stores and provides information and a client computer that requests the information,
Oite to the server computer, and the difference information generation step of generating difference information which pressurized attached to the transferred information to the client computer,
A load measuring step of measuring at least one of a communication load of the communication medium, a system load of the server computer, or a system load of the client computer;
Based on the measured at the load measuring step load, said calculating the amount of information that can be transferred to the client computer from the server computer, the difference when the transportable information amount is larger than the information amount of the difference information A load calculation step for instructing the start of information transfer;
A difference information transfer step of transferring the difference information to the client computer according to the transfer start instruction;
A difference information adding step of adding the difference information to the transferred information of the client computer. The load measuring step includes
Measuring the communication load using at least one of the number of packets flowing through the communication medium, the size of the packet, the number of collisions, and the line usage rate;
The system load includes the CPU usage rate of the computer, the number of disk I / Os, the number of page-in / out times, the number of swap-in / out times, the number of processes, the hit rate of the CPU cache, the hit rate of the disk cache, and the data transfer amount of the system bus The information transfer method according to claim 3, further comprising a step of measuring using at least one of the information. A computer-readable recording medium that records an information transfer program in a computer network that is connected to each other using a communication medium and includes a server computer that stores and provides information and a client computer that requests the information,
Computer
Oite to the server computer, the difference information generation means for generating difference information which pressurized attached to the transferred information to the client computer,
Load measuring means for measuring at least one of the communication load of the communication medium, the system load of the server computer, or the system load of the client computer;
Based on the measured load in the load measuring means, wherein the calculating the amount of information that can be transferred to the client computer from the server computer, the difference when the transportable information amount is larger than the information amount of the difference information Load calculation means for instructing the start of information transfer;
Difference information transfer means for transferring the difference information to the client computer according to the transfer start instruction;
And a computer-readable recording medium recording an information transfer program for causing the client computer to function as difference information adding means for adding the difference information to the transferred information. The load measuring means includes
Measuring the communication load using at least one of the number of packets flowing through the communication medium, the size of the packet, the number of collisions, and the line usage rate;
The system load includes the CPU usage rate of the computer, the number of disk I / Os, the number of page-in / out times, the number of swap-in / out times, the number of processes, the hit rate of the CPU cache, the hit rate of the disk cache, and the data transfer amount of the system bus The computer-readable recording medium on which the information transfer program according to claim 5 is recorded is measured using at least one of the above.

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