JP3237592B2 - Communication load control method, its device, and its program recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication load control method, a device therefor, and a program recording medium therefor.
In particular, the present invention relates to a communication load control method for restricting communication processing from occupying computer resources, an apparatus thereof, and a program recording medium thereof.

[0002]

2. Description of the Related Art Conventionally, this type of communication load control device is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-313988.
In file transfer between a plurality of systems connected via a network, Cen for data compression / decompression processing
tral Processing Unit (hereinafter C
It is called PU. ) Used to prevent performance degradation of the entire system due to load.

FIG. 6 is a block diagram showing an example of the above-mentioned communication load control device. In the figure, the system is composed of a plurality of computer systems 66 and a computer system (host) 61 connected via a network 65. Computer system (host) 61
Is composed of an application program 62 for controlling file transfer, a file transfer service program 63, and a file 64. Further, the file transfer service program 63
a, a line input / output control unit 63b, and a data compression processing unit 6
3c, a data decompression processing unit 63d, and a file input / output control unit 63e.

[0004] Upon receiving a data-compressed file from the partner system, the file transfer control unit 63a passes the data-compressed file data directly to the file input / output control unit 63e without passing through the data decompression processing unit 63d. It is stored in the file 64 in a compressed state. Then, when transmitting this file to the partner system, the file data read out by the file input / output control unit 63e is directly passed to the line input / output control unit 63d without passing through the data compression processing unit 63c, and is directly transmitted (data compression at the time of reception). Transmitted).

Another example is disclosed in Japanese Patent Application Laid-Open No.
According to Japanese Unexamined Patent Publication No. 3 (KOKAI) No. 3, Integrated Service
ces Digital Network (hereinafter referred to as IS
It is called DN. 2. Description of the Related Art A transfer device for transferring file data to a data processing device at a remote location via a) is used to efficiently transfer a large amount of file data with a minimum CPU load.

FIG. 7 is a block diagram showing an example of the above system. In the figure, the system includes file data transfer devices (FDTE) 71 and 76, a central processing unit (CPU) 72, a file device (DISK) 73,
It comprises a common bus 74 and an ISDN network 75. The FDTE 71 includes a bus adapter unit 711 and an IDS
Interface unit with ISDN (ISDN IF) 712
And two block buffer units BFA714 and BF
B713, a control buffer unit (CONT) 715, and a header block buffer unit (HBB) 716.

FDTE 71, CPU 72 and DISK 73
Are connected to the common bus 74 and the bus adapter unit 7
Reference numeral 11 looks like a general IO adapter from the CPU 72 side, and communication between the CPU 72 and the FDTE 71 is achieved by performing a read / write operation on a specific address on the bus.

[0008] When transferring the file, the CPU 72
The header block storing the data file to be transferred and various control information to be passed to the FDTE 71 is
3 and then activates the FDTE 71. FDT
E71 reads the contents of the header block to the HBB 716, puts the address of the other device (FDTE 76) on the ISDN network 75, and continuously transfers file data while autonomously accessing the DISK 73.

[0009]

The conventional communication load control device as described above has the following problems.

The first problem is that the degree of CPU load cannot be adjusted to any quantitative value. The reason is,
This is because there is no structure that can adjust the degree of CPU load.

The second problem is that it cannot be applied to any communication application other than file transfer.
The reason is that the field of use is intended only for file transfer, and no consideration is given to non-continuous transfer of data such as online transaction processing.

A third problem is that the own system and the partner system need to have the same communication load control device. The reason is that it is assumed that both communicating systems have the same communication load control device.

A fourth problem is that the effect of suppressing the CPU load is exhibited only when the file is compressed, and the effect cannot be exhibited in other cases. The reason is,
This is because it is assumed that the file is compressed.

The fifth problem is that the method cannot be applied to networks other than the ISDN network. The reason is that it is assumed that connection to the ISDN network is made.

Accordingly, it is an object of the present invention to provide a communication load control device capable of suppressing the amount of CPU usage time used by a communication system to a quantitatively arbitrary value.

Another object of the present invention is to provide a communication load control device applicable to any communication application other than file transfer.

Another object of the present invention is to provide a communication load control device in which a partner system does not need to have the same communication load control device as its own system.

Another object of the present invention is to provide a communication load control device which exerts an effect of suppressing a CPU load even when a file is not compressed.

Another object of the present invention is to provide a communication load control device applicable to any network.

[0020]

According to a communication load control method of the present invention, in a computer system for transferring a file via a communication network, a computer load required for the file transfer is constantly monitored, and the computer load is controlled within a preset threshold value. This is realized by allocating resources to file transfer.

In the communication load control method according to the present invention, the computer usage time spent by the communication driver on controlling the communication procedure is constantly measured, and the computer usage time threshold value set in advance is compared with the computer usage time. Is smaller than the latter, it is realized by suppressing the communication throughput of the communication driver.

Further, the communication load control device of the present invention comprises: a CPU usage time measuring means for constantly measuring the computer usage time spent by the communication driver for controlling the communication procedure and sending it out as a computer usage time value; CPU usage time threshold value setting means for holding a threshold value, and CPU usage for taking in the computer usage time threshold value and the computer usage time value, comparing the two, and sending a throughput suppression instruction signal when the former is smaller than the latter. It comprises time threshold value determining means and throughput suppressing means for suppressing the communication throughput of the communication driver according to the throughput suppressing instruction signal.

Further, in the communication load control device according to the present invention, the throughput suppressing means is configured to reduce the communication window size of the communication driver to suppress the communication throughput.

Further, the program recording medium of the communication load control device according to the present invention includes a step of holding a computer usage time threshold value set in advance, and a method of constantly measuring the computer usage time spent by the communication driver for controlling the communication procedure. Sending as a time value; taking the computer use time threshold value and the computer use time value; comparing the two; and sending a throughput suppression instruction signal when the former is smaller than the latter; Suppressing the communication throughput of the communication driver according to the above.

Further, the program recording medium of the communication load control device according to the present invention includes a step of holding a computer use time threshold value set in advance, and a method of constantly measuring a computer use time spent by the communication driver on control of the communication procedure to use the computer. Sending as a time value; taking the computer use time threshold value and the computer use time value; comparing the two; and sending a throughput suppression instruction signal when the former is smaller than the latter; And reducing the communication throughput by reducing the communication window size of the communication driver.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention. In FIG. 1, the communication load control device according to the present invention is configured to be included in a computer system 5, a network 7, and a partner system 6.

The computer system 5 includes: a communication system 1; a communication application 2 that uses the communication system 1 to communicate with a partner system 6 via a network 7;
And an application 3 that performs normal tasks. The communication system 1 includes a communication driver 10, a CPU usage time measurement unit 11, a CPU usage time threshold value determination unit 12
And a throughput suppressing means 13 for suppressing the throughput of the communication driver 10 and a CPU usage time threshold value setting means 1
4 is provided.

The communication application 2 performs communication tasks such as data transfer and transaction processing with the partner system 6 via the network 7 using the communication system 1. The application 3 performs a task that does not use the communication system 1.

The communication driver 10 controls a communication procedure for communicating with the partner system 6 via the network 7.

The CPU usage time measuring means 11 constantly measures the CPU usage time spent by the communication driver 10 on the communication procedure control, generates a CPU usage time value 100 from the measured CPU usage time, and determines the CPU usage time threshold value. To the means 12.

The CPU usage time threshold value determination means 12
The CPU usage time value 100 received from the U usage time measurement means 11 is compared with the CPU usage time threshold value 101 to determine which value is larger. As a result, when the CPU usage time threshold value 101 is large, the CPU usage time threshold value determination means 12 does nothing. On the other hand, the CPU usage time value 10
When 0 is large, a throughput suppression instruction 102 is sent to the throughput suppression means 13.

The throughput suppression means 13 receives a throughput suppression instruction 102 from the CPU usage time threshold value determination means 12.
Is received, the communication throughput is suppressed by using a method such as reducing the communication window size of the communication driver 10.

The CPU usage time threshold value setting means 14 sends a preset CPU usage time threshold value 101 to the CPU usage time threshold value determination means 12.

FIG. 2 is a flowchart showing the operation of the above-mentioned communication load control device. In the figure, first, the CPU usage time threshold value setting means 14
Is set to the CPU usage time threshold value 101 (step A
1). On the other hand, the communication application 2 activates the communication system 1 and performs communication tasks such as data transfer and transaction processing. In addition, the communication system 1 uses the communication driver 10 to
And a communication means for communicating with the server.

The CPU usage time measuring means 11 constantly measures the CPU usage time spent by the communication driver 10 on communication procedure control, generates a CPU usage time value 100 from the measured CPU usage time, and determines the CPU usage time threshold value. It is sent to the means 12 (step A2).

The CPU usage time threshold value judging means 12
The CPU usage time value 100 received from the U usage time measurement means 11 is compared with the CPU usage time threshold value 101 to determine which value is larger (step A3). CP
When the U usage time threshold value 101 is large, the CPU usage time threshold value determination means 12 does nothing. On the other hand, when the CPU usage time value 100 is large, the CPU usage time threshold value determination unit 12 sends a throughput suppression instruction 102 to the throughput suppression unit 13.

The throughput suppression means 13 receives a throughput suppression instruction 102 from the CPU use time threshold value determination means 12.
Is received, the communication throughput is suppressed using a method such as reducing the communication window size of the communication driver 10 (step A4). In the communication driver 10, the communication throughput is suppressed by the method of reducing the communication window size by the throughput suppression unit 13 and the like, so that the communication amount is reduced and the CPU usage time is reduced.

Thereafter, until the CPU usage time value 100 becomes smaller than the CPU usage time threshold value 101, steps A2 and
A3 and A4 are repeated.

When the communication application 2 is started by the above means, the CPU usage time consumed by the communication system 1 is set to a predetermined CPU usage time threshold value of 10
Since it is smaller than 1, the performance degradation of the application 3 other than the communication can be minimized.

Next, effects of the first embodiment will be described.

The above-described communication load control device suppresses the CPU usage time when the communication application 2 operates to be equal to or less than a predetermined threshold value. Therefore, performance degradation of the application 3 other than the communication can be suppressed to a minimum.

Also, by setting the CPU usage time threshold value 101 to an arbitrary value, the degree of CPU load can be adjusted to an arbitrary quantitative value.

Further, since the communication application 2 can be constructed independently of the communication system 1, the communication application 2 does not necessarily have to be a file transfer application. Applicable to communication applications.

Further, the computer system 5 can be configured independently without depending on the communication load control of the partner system 6. Therefore, the partner system 6 does not necessarily need to have the same communication load control device as the own system.

The communication load control device described above does not depend on the data format used by the communication application 2. Therefore, the effect of suppressing the CPU load can be exhibited even when the file is not compressed.

In the above-mentioned communication load control device, the network 7 does not necessarily need to be an ISDN network as a precondition for implementation. Therefore, the communication load control device described above can be applied to any network.

FIG. 3 is a block diagram showing a second embodiment of the present invention. In the figure, a computer system 5a includes a communication system 1a, and the communication system 1a serves as a communication driver for High level data l.
An HDLC driver 10a for controlling an ink control (hereinafter, referred to as HDLC) procedure is provided. Other configurations are the same as those in FIG. FIG. 4 is a sequence diagram showing an operation example of the communication load control device.

First, referring to FIG. 3, the CPU usage time threshold value setting means 14 is used to set the CPU usage time threshold value 101 in the CPU usage time threshold value determination means 12. The threshold value indicates that all available CPU time is set to the HDLC driver 10
When the area occupied by a is converted to 100%, the value is specified between 0% and 100%. However, if the threshold value is very close to 0%, the HDLC driver 10a
There is no point in specifying the PU because almost no PU can be used. Similarly, if the threshold value is very close to 100%, almost all available CPU time is occupied by the HDLC driver 10a, so this is meaningless. Therefore, it is usually desirable to specify a threshold value between 10% and 90%.

When the communication application 2 starts data transmission, the HDLC driver 10a converts the transmission data received from the communication application into an information frame (hereinafter, referred to as an information frame).
It is called an I frame. ) Is generated, and continuous transmission is performed for the number N1 of transmitting outstanding figures (FIG. 4A).
reference). The number of transmitting outstandings is a parameter defined in the HDLC procedure, and is the number of I-frames that can be continuously transmitted without waiting for an I-frame acknowledgment frame (hereinafter referred to as an RR frame). Take a value. As the number of transmission outstandings increases, the number of I-frames that are continuously transmitted increases, and the communication throughput improves. On the other hand, the operation frequency of the HDLC driver 10a that operates per unit time also increases.
CPU time consumed per unit time also increases.

The CPU usage time measuring means 11 is an HDLC
The driver 10a constantly measures the CPU usage time spent for controlling the communication procedure. The CPU usage time can be measured by calculating the difference between the time when the HDLC driver 10a starts operating and the time when the operation ends, and integrating the difference. CPU usage time value 10 based on measured CPU usage time
0 is generated and sent to the CPU usage time threshold value determination means 12.

The CPU usage time threshold value judging means 12
The CPU usage time value 100 received from the U usage time measuring means 11 is compared with the CPU usage time threshold value 101. The comparison is performed at regular time intervals (for example, 1 millisecond) by the CPU.
Calculate the percentage of usage time value 100 within the regular time,
A comparison can be made by determining the magnitude relationship between the ratio and the CPU usage time threshold value 101. As a result of the comparison, when it is determined that the CPU usage time value 100 is larger, a throughput suppression instruction 102 is sent to the throughput suppression means 13.

The throughput suppression means 13 receives a throughput suppression instruction 102 from the CPU usage time threshold value determination means 12.
Upon receiving this, the number of transmitting outstandings of the HDLC driver 10a is reduced by 1 (see FIG. 4B). HDL
When the number of transmitting outstandings of the C driver 10a decreases, the operation frequency of the HDLC driver 10a also decreases, and the CPU time consumed per unit time also decreases.

Thereafter, steps A2, A3 and A4 of FIG. 2 are repeatedly executed until the CPU usage time value 100 becomes smaller than the CPU usage time threshold value 101, and the number of transmitting outstandings of the HDLC driver 10a is continuously reduced.

FIG. 5 is a block diagram showing a third embodiment of the present invention. In the figure, a computer system 5b includes a recording medium 4 on which a communication load control program is recorded. The recording medium 4 may be a magnetic disk, a semiconductor memory, or another recording medium.

The communication load control program is read from the recording medium 4 into the communication system 1b, and controls the operation of the communication system 1b. The communication system 1b executes the same processing as the communication system 1 in FIG. 1 or the communication system 1a in FIG. 3 under the control of the communication load control program. That is, the communication application 2 activates the communication system 1b to start communication operations such as data transfer and transaction processing. At this time, the communication system 1b executes a communication procedure for communicating with the partner system b via the network 7. I do. When the communication procedure is executed, the CPU usage time spent on the communication procedure control is constantly measured, and if the measured CPU usage time is larger than a preset CPU usage time threshold value, the CPU usage time is measured. The communication throughput is suppressed until it becomes smaller than the threshold value.

[0057]

As described above, according to the present invention, the following effects can be obtained.

The first effect is that the degree of CPU usage time of the communication driver can be adjusted to a quantitatively arbitrary value. As a result, the C of the communication application and another application
The ratio of the degree of PU load can be adjusted. The reason is that by setting the CPU usage time threshold value to a desired value in advance, the upper limit of the CPU usage time of the communication driver can be freely selected.

The second effect is that the present invention can be applied to any communication application other than file transfer. Thus, the range of available communication applications expands,
For example, even when a communication application that performs transaction processing is used, the communication load can be controlled. The reason is that the present invention does not depend on the communication application either in terms of configuration or operation.

The third effect is that the partner system does not need to have the same communication load control as the own system. That is,
Communication load control can be realized only by changing the own system without changing the other system. The reason is that the present invention does not depend on the configuration and operation of the partner system.

The fourth effect is that the CPU load can be suppressed even when the file is not compressed. The reason is that the present invention does not depend on the contents of the communication data either in terms of configuration or operation.

The fifth effect is that it is possible to provide communication load control applicable to any network. The reason is that the present invention does not depend on the type of the network either in terms of configuration or operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the present invention.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a sequence diagram showing an operation example of the second embodiment of the present invention.

FIG. 5 is a block diagram showing a third embodiment of the present invention.

FIG. 6 is a block diagram showing a conventional example.

FIG. 7 is a block diagram showing another conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 communication system 2 communication application 3 application 4 recording medium 5 computer system 6 partner system 7 network 10 communication driver 11 CPU usage time measurement means 12 CPU usage time threshold value determination means 13 throughput suppression means 14 CPU usage time threshold value setting means 100 CPU Usage time value 101 CPU usage time value 102 Throughput suppression instruction

Claims (6)

(57) [Claims] 1. A computer system for performing file transfer via a communication network, wherein a computer load required for file transfer is constantly monitored, and computer resources are allocated to file transfer within a preset threshold. Load control method. 2. The communication driver constantly measures a computer usage time spent for controlling a communication procedure, compares a computer usage time threshold value set in advance with the computer usage time, and when the former is smaller than the latter, the communication driver A communication load control method characterized by suppressing communication throughput. 3. A CPU usage time measuring means for constantly measuring a computer usage time spent by the communication driver for controlling a communication procedure and transmitting the computer usage time value as a computer usage time value, and a CP for holding a preset computer usage time threshold value.
U usage time threshold value setting means, and CPU usage time threshold value determination means for receiving the computer usage time threshold value and the computer usage time value, comparing the two, and sending a throughput suppression instruction signal when the former is smaller than the latter. A communication load control device, comprising: a throughput suppression unit configured to suppress a communication throughput of the communication driver in accordance with the throughput suppression instruction signal. 4. The communication load control device according to claim 3, wherein said throughput suppression means suppresses communication throughput by reducing a communication window size of a communication driver. 5. A step of storing a computer usage time threshold value set in advance, a step of constantly measuring a computer usage time spent by the communication driver for controlling a communication procedure, and transmitting the computer usage time value as a computer usage time value. Capturing a value and the computer use time value, comparing the two, and transmitting a throughput suppression instruction signal when the former is smaller than the latter, and suppressing the communication throughput of the communication driver according to the throughput suppression instruction signal. A program recording medium for a communication load control device, characterized by comprising: 6. A step of holding a computer usage time threshold value set in advance, a step of constantly measuring a computer usage time spent by the communication driver on controlling a communication procedure and transmitting the same as a computer usage time value; A step of transmitting a throughput suppression instruction signal when the former is smaller than the latter by taking in the value and the computer use time value, and reducing the communication window size of the communication driver according to the throughput suppression instruction signal. And a step of suppressing communication throughput.