JPH10289188A - Server-client communication priority controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the load of a server and a network at each fixed level and to secure the effective communication by adding the priority to every information to be communicated and performing the communication control to notify a client of the communication start time via the server. SOLUTION: A server S stores a current client C and the number of processes under communication in a communication process number storage part M2 and also decides the upper limit of the communication process number. If the number of processes under communication exceeds its upper limit value on the inquiry about the propriety of communication of the client C, a priority class and the priority class-based sequence are stored in a communication wait list storage part M1 based on the priority class attendant on the communication request information on the client C. When the number of processes under communication becomes less than its upper limit value, the communication is allowed to the request of the highest priority based on the priority class and the priority class-based sequence stored in the part M1. Then a communication enable state is notified to the client C and the communication is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information communication apparatus between a server and a client, and more particularly to an apparatus for controlling the priority of communication between a server and a client.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing a conventional communication method between a client and a server. In the figure, communication is performed between a server S that accepts communication and a client C that requests communication. The server S secures a storage area M required for communication each time it accepts communication, and the communication ends. This is a method of releasing a storage area secured for communication. This communication method is described in detail in "UNIX Network Programming, Ohmsha, 1993".

[0003]

The conventional communication control apparatus performs processing in the order in which the communication is received, and performs communication processing of the received information in parallel. If the load on the server S increases due to an increase in the usage of the server, communication may be extremely slow, and the processing load on the server S may increase the load on the network and cause a failure. There was a point.

[0004]

According to a first aspect of the present invention, there is provided a server / client communication priority control apparatus in which a client makes an inquiry to a server to inquire whether communication is possible, and the server determines whether each client can communicate. A communication control means for giving an identifier including, and performing communication control according to the identifier in the communication between the server and the client,
The communication control means includes: a receiving means for receiving communication with each of the clients in the server; and various types of information having a predetermined priority with respect to each information. The server receives an inquiry from the client to the storage device. Time, the name of the client who contacted us,
Holding means for holding in the storage device the priority of the information for which the client has made a transmission request; determining means for determining whether or not communication is possible for each of the client's communication priorities; and providing the result of the determination to each client. Notification means for notifying.

The server-client communication priority control apparatus according to the second aspect of the present invention sets an upper limit on the elapsed time after receiving an inquiry for each priority in advance, so that when the upper limit of the elapsed time is exceeded, the client will Determining means for determining that communication can be started, and changing means for setting an upper limit on the number of communication program activations that can simultaneously execute communication in advance and dynamically changing the number of communication program activations that can execute communication from the communication reception status for each priority Is provided.

In the server-client communication priority control apparatus according to the third invention, when various types of information are equal to or larger than a certain size, when the client inquires of the server whether or not communication is possible, the information is fixed. Divide into sizes,
Inquiring means for making an inquiry for each of the divided information, a priority changing function for reducing the communication delay by changing the priority of the divided information, and a function of combining the information divided and sent by the server Is provided.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a diagram showing a communication sequence according to an embodiment of the present invention. In response to a communication request from a client C, the name of the client C, the request reception time, and the priority class of various information as priority and the current The priority order by priority class is stored in the communication waiting list storage unit M1 as the reception order in the same priority class.

In the client C, when making a communication request to the server S, if the information to be communicated exceeds the upper limit of the communication data amount predetermined on the client C side, the communication is divided into the predetermined data amount and the divided data amount is divided. A communication request is made to the server S for each piece of information. At this time, if the communication delay becomes larger than a predetermined value due to the communication status with the server S, the communication request is made with the priority of the information for which the transmission request is made later increased by one class.

Next, the server S stores the upper limit value of the current number of communication processes and the number of communication processes currently performing communication in the number-of-communications-processes storage unit M2. The number-of-communications-processes storage unit M2 is checked to see if it exceeds a predetermined upper limit, and if it does not exceed the upper limit, the client C is permitted to communicate.

[0010] The client C permitted to communicate starts communication with the server S. At this time, the server S increases the number of the communication process number storage unit M2 by one.

In the server S, when information is divided and transmitted by the client C during communication, the information is combined.

After the communication is completed, the client C notifies the server S of the communication completion. At this time, the server S decreases the number of the communication process number storage unit M2 by one.

Embodiment 2 FIG. FIG. 1 shows, in response to a communication request from a client C, the name of the client C, the reception time of the request, and the priority class of the various information as the priority and the priority class as the reception priority in the current same priority class. Another order is stored in the communication waiting list storage unit M1.

In the client C, when making a communication request to the server S, if the information to be communicated exceeds the upper limit of the communication data amount predetermined on the client C side, the communication is divided into the predetermined data amount and the divided data amount is divided. A communication request is made to the server S for each piece of information.

Next, the server S stores the upper limit value of the current number of communication processes and the number of communication processes currently performing communication in the number-of-communications-processes storage unit M2. The communication process number storage unit M2 is checked to see if it exceeds the predetermined upper limit, and if it exceeds the upper limit, the client C is notified of standby.

If the other communication is completed and the number of running communication processes is reduced, the waiting time is calculated by subtracting the current time from the reception time for each request stored in the communication waiting list storage unit of the server S, Set the priority class and the priority order by priority class. At this time, a threshold value of the waiting time is determined in advance for each priority class, and a request exceeding the threshold value increases the priority class by one class. Is assigned as the priority order by priority class.

An upper limit is set in advance for the number that can be held in the communication waiting list of the highest priority class. If the upper limit is exceeded, the upper limit of the number of communication processes of the server S is increased by one, and communication to the client C is performed. Notify that you can do it. When this process is performed, the upper limit value of the number of communication processes after the end of the communication is reduced by one.

[0018] The client C permitted to communicate starts communication with the server S. At this time, the server S increases the number of communication process number storage units M2 by D1.

In the server S, when information is divided and transmitted by the client C during communication, the information is combined.

After the communication is completed, the client C notifies the server S of the communication completion. At this time, the server S decreases the number of the communication process number storage unit M2 by one.

Embodiment 3 FIG. 3 is a diagram showing a communication sequence according to an embodiment of the present invention. In FIG. 3, a request 1 for communication is received from a client. If there is a request, it is determined whether or not transmission is possible after 3.

When a request from the client is received in the above 1, in 3, the request reception time and the priority class are stored in the communication wait list storage according to the priority class of the information requested to be transmitted in the communication wait list storage. And the priority order by priority class is stored as the order in the current same priority class.

At 4 it is determined whether there is a waiting request. If there is no waiting request, at 6 the client is permitted to communicate with the accepted request. If there is a request with a long waiting time in step 4, the contents of the communication process number storage unit are checked in step 5. At 7, it is determined whether or not the number of communication processes exceeds a predetermined upper limit of the number of communication processes. If the number does not exceed, the client is permitted to communicate with the request accepted at 9. If the number of communication processes exceeds the upper limit, the process of step 8 is performed.

[0024] In the case of 8, if the number exceeds the maximum number that can be held in the communication waiting list of the highest priority class in advance,
At 10, the upper limit of the number of communication processes of the server S is increased by 1, and at 9 it is notified that the client can communicate.
If the number does not exceed the upper limit of the number that can be held in the communication waiting list of the highest priority class, the client is notified in step 11 of communication waiting.

Embodiment 4 FIG. 4 is a diagram showing a communication sequence according to the embodiment of the present invention.
The communication permission is notified to the client, the data related to the request is deleted from the communication waiting list storage unit, the number in the communication process number storage unit is increased by 1, and communication with the client is started.

At 13 and 15, the continuation of the communication is monitored, and when the communication is completed, at 14 the number in the communication process number storage section is decremented by one. Also, in 14, when the communication is performed at 10 exceeding the upper limit of the communication process, the number of the upper limit of the communication process is reduced by one. In step 16, the information is combined when the information is divided and transmitted on the client side.

At 17, the communication waiting list storage section is inspected,
If there is a request to wait for communication, the process of 4 in FIG. 3 is performed. If there is no request waiting, the process ends, and the process returns to a state of waiting for a request from a client.

Embodiment 5 FIG. 5 is a flowchart showing an embodiment of the present invention. In step 18, the client confirms whether or not the size of the information to be transmitted is within a specified range. If it is within the specified range, the process proceeds to step 19. 20 if it is larger than the specified size range
Divides the information into prescribed sizes and raises the priority class of the information by one.

In step 19, the server S is requested to permit communication. If the communication is permitted, the communication 22 is started. If the communication is not permitted and the standby is instructed, 21
The communication waits until the communication is permitted.

The client monitors the continuation of the communication at 23 and 24, and when the communication is completed, the server S informs that the communication has been completed.
And terminates the communication.

The features of the first to third aspects of the present invention are described below.

In the server / client communication priority control apparatus according to the first aspect of the present invention, the server first stores the number of activated communication programs (the number of communication processes) currently communicating with the client in the number of communication processes storage unit. In addition, the server determines an upper limit of the number of communication processes in advance. When the client needs to communicate with the server, the client inquires of the server whether communication is possible.If the number of currently communicating communication processes stored in the number of communication processes storage unit does not exceed the upper limit, the client asks the client. Allow communication. If the number of communication processes during communication exceeds the upper limit, the name of the client, the request reception time and the priority are stored in the communication waiting list storage unit according to the priority class attached to the information requested by the client. The priority class-specific order is stored as the priority order of the priority class of the various information and the current same priority class. When the number of communication processes during communication is reduced from the upper limit value, communication is permitted for the priority class stored in the communication waiting list storage unit and the request with the highest priority in the priority class order. , The client is notified that communication is possible, and communication is started.

A server-client communication priority control apparatus according to a second aspect of the present invention provides an upper limit of the number of communication processes that the server can simultaneously communicate with, and when the number of communication processes of the server decreases from the upper limit, the communication waiting list of the server. The waiting time is calculated by subtracting the current time from the reception time for each request stored in the storage unit, and the priority class and the priority class order are set. At this time, a threshold value of the waiting time is determined in advance for each priority class, and a request exceeding the threshold value increases the priority class by one class. Is assigned as the priority order by priority class. In addition, an upper limit of the number that can be held in the communication waiting list of the highest priority class is set in advance, and when the upper limit is exceeded, the upper limit of the number of communication processes of the server is increased by 1 so that the client can communicate with the client. The communication is started, the communication is started, and the upper limit value of the number of communication processes is reduced by 1 after the communication is completed.

The server-client communication priority control apparatus according to the third invention divides the communication data into a predetermined data amount when the communication data exceeds a communication data amount upper limit predetermined on the client side. A communication request is made to the server for each of the divided information. If the communication delay becomes larger than a predetermined value due to the communication status with the server, the priority of the information for which the transmission request is made later is set to 1
Make a communication request with the class higher. The server combines the information divided and transmitted by the client to complete the reception of the information.

[0035]

The server / client communication priority control apparatus of the present invention described above has the following effects.

According to the first aspect, the priority is assigned to each piece of information to be communicated, and the server S performs communication control for notifying the client of the start time of the communication, so that the load on the server S and the load on the network are constant. Communication can be performed efficiently.

According to the second aspect of the present invention, the server S determines whether or not the client can communicate, and controls the timing of communication with the client, thereby enabling efficient communication.

According to the third aspect of the present invention, efficient communication is performed by dividing data having a large data amount on the client side and transmitting the divided data, and inquiring whether or not the divided data can communicate with the server S. be able to.

[Brief description of the drawings]

FIG. 1 is a diagram showing a communication sequence 1 according to an embodiment of the present invention.

FIG. 2 is a diagram showing a communication sequence 2 according to the embodiment of the present invention.

FIG. 3 is a diagram showing a flowchart 1 of the embodiment of the present invention.

FIG. 4 is a diagram showing a flowchart 2 of the embodiment of the present invention.

FIG. 5 is a diagram showing a flowchart 3 of the embodiment of the present invention.

FIG. 6 is a diagram showing a conventional method.

[Description of Signs] S server, C client, M1 communication waiting list storage unit, M2 communication process number storage unit, M server storage area.

Claims (3)

[Claims] 1. A server-client communication control device for controlling communication between a plurality of clients transmitting various information and a server receiving the various information from the plurality of clients, wherein the client communicates with the server. The server performs an inquiry to inquire whether or not communication is possible, the server provides an identifier including communication availability to each client, and includes communication control means for performing communication control according to the identifier in communication between the server and the client, wherein the communication control means comprises: Receiving means for receiving communication with each of the clients in the server, various kinds of information have a predetermined priority for each information, the server, the time when the storage device has been inquired from the client,
Holding means for holding, in a storage device, the name of the client that has made the inquiry and the priority of the information for which the client has made a transmission request; determining means for determining whether communication is possible for each communication priority of each client; And a notifying means for notifying each client of the result of the determination. 2. An upper limit is set in advance for an elapsed time after receiving an inquiry for each priority,
If the elapsed time exceeds the upper limit, a determination unit that determines that the client can start communication, and an upper limit of the number of communication program activations that can simultaneously execute communication in advance are provided,
2. The server-client communication priority control device according to claim 1, further comprising a change unit that can dynamically change the number of communication program activations that can execute communication from the communication reception status for each priority. 3. When various types of information are larger than a certain size, when the client inquires of the server whether or not communication is possible, the information is divided into certain sizes, and an inquiry is made for each of the divided information. Requesting means for performing, a priority changing function for reducing a communication delay by changing a priority of the divided information, and a function of combining information transmitted separately by the server. Item 2. The server-client communication priority control device according to item 1.