JPH05189341A - Residence monitoring system for data transmission request queue - Google Patents

Abstract

PURPOSE:To attain the effective utilization of the memory of a main storage part by preventing data which can not be transferred for a communication buffer is full, from being placed on the main storage part. CONSTITUTION:A communication interface part 105 performs an access to data transmission request queue management tables 115-a, 115-b, and 115-c, so that the number of effective data transmission request queues can be calculated. Then, the communication interface part 105 monitors the residential state of the data transmission request queue from the calculated value and the information of a data transmission request queue residence monitoring table 108, and communicates the residential state to a CPU 101 according to the state of the queue residence. At the time of receiving the data transmission request queue residence information/residence recovery information from the communication interface part 105, the CPU 101 performs the transmission data registration suppressing/resuming processing to a main storage part 102 for the pertinent line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer system including a host computer having a CPU, a main memory unit and a communication interface unit, and a multi-line controller and a plurality of terminals. The present invention relates to control of a data transmission request to a multi-line control device.

[0002]

2. Description of the Related Art Conventionally, when a channel device in a host computer receives an instruction from a CPU and transfers transmission data from a main storage device in the host computer to a buffer in an input / output device, for example, Japanese Patent Application Laid-Open No. 1-58242 is used. As described in JP-A-291350, the channel device counts the number of times the transmission data in the main storage device is transferred to the input / output device.
Further, the channel device counts the number of times of reporting the end of processing for the transmission data from the input / output device. The channel device compares the transmission data transfer count to the input / output device with the end report count from the input / output device, and compares this comparison result with the buffer count of the input / output device. According to the comparison, the channel device detects the availability of the data buffer of the input / output device, and when the data buffer of the input / output device becomes full, the transfer of the transmission data in the main memory to the input / output device is stopped. ..

[0003]

The above prior art does not consider means for reporting to the CPU that registers transmission data in the main storage device that the data buffer of the input / output device is full. The CPU also registers, in the main storage device, transmission data for an input / output device whose data buffer is full. Therefore, if the processing for registering the transfer data for the input / output device with the full data buffer in the main storage device occurs intensively, the channel device does not transfer the transmission data to the corresponding input / output device. There is a problem that it accumulates in the storage device and requires more memory than necessary depending on the system. Further, when the transmission data waiting to be transferred is prevented from accumulating in the main storage device, C
There is also a problem in that the PU cannot be notified to wait for the transfer data for the input / output device that is full of the data buffer to be registered in the main storage device.

It is an object of the present invention to CP transmit data to an input / output device whose data buffer is full or nearly full.
To prevent U from registering in main memory, the channel device
This is to notify the PU so that transmission data waiting to be transferred is not accumulated in the main storage device.

[0005]

To achieve the above object, the following means are provided.

In a host computer provided with a communication interface unit which is connected to a multi-line control device having a CPU, a main storage unit and a plurality of line control modules, and which requests the line control module for data transmission,
The line control module is provided with the following.

(1) A table for storing a data transmission request queue received from the communication interface unit is provided.

(2) A means for storing the number of the data transmission request queues is provided.

(3) A means for counting the number of queues for which the processing for the data transmission request received from the communication interface unit is completed, and a means for storing the counted value are provided.

Further, the communication interface unit is provided with the following.

(A) A means is provided for counting the number of data transmission request queue registrations in the line control module when the data transmission request queue is registered in the table of (1) above.

(B) A means for detecting the number of valid data transmission request queues stored in the line control module is provided.

(C) A comparison constant is provided for determining that the data transmission request queue is stored in the line control module.

(D) Means for detecting that the data transmission request queue is accumulated in the line control module is provided from the number of the valid data transmission request queues and the comparison constant.

(E) A comparison constant is provided to determine that the data transmission request queue retained in the line control module has been swept.

(F) Means is provided for detecting that the data transmission request queue retained in the line control module has been swept based on the number of valid data transmission request queues and the comparison constant.

(G) A means for storing the staying status of the data transmission request queue in the line control module is provided.

(H) When the stored retention status is the non-retention status, when a retention of the data transmission request queue in the line control module is detected, a means for notifying the CPU is provided.

(I) When the stored retention status is the retention status and a retention recovery of the data transmission request queue in the line control module is detected, a means for notifying the CPU is provided.

Further, the CPU is provided with means for suppressing registration of transmission data for the corresponding line control module in the main memory when the data transmission request queue retention report is received from the communication interface. Then, the CPU is provided with means for canceling the registration inhibition of the transmission data for the relevant line control module in the main storage unit when receiving the data transmission request queue retention recovery report from the communication interface unit.

[0021]

In a host computer having a communication interface unit that is connected to a CPU, a main storage unit, and a multi-line control device having a plurality of line control modules, and makes a request for data transmission to the line control module, If the table for storing the data transmission request queue in the line control module has a free space, the communication interface unit registers the data transmission request queue in the table and adds the data transmission request queue registration number. When the table has a data transmission request queue, the line control module transfers the transmission data corresponding to the request from the main storage unit and transmits the data to the corresponding line. Then, when the processing for the request is completed, the number of processing completion queues is added.

The communication interface section periodically reads the number of data transmission request queue registrations and the number of processing completion queues from the storage table, and calculates the number of valid data transmission request queues stored in the line control module.

In the state where the data transmission request queue retention recovery has been reported, and the calculated number of valid data transmission request queues is from the comparison constant for determining that the data transmission request queues are accumulated in the line control module. If it is larger, the communication interface unit reports the retention of the data transmission request queue to the CPU. Then, the CPU, which has received the report indicating that the data transmission request queue stays, inhibits the transmission data for the relevant line control module from being registered in the main storage unit. In addition, a comparison constant for determining that the data transmission request queue that has been accumulated in the line control module when the data transmission request queue retention report has already been made and the calculated number of valid data transmission request queues has been swept If it is smaller, the communication interface unit reports the data transmission request queue retention recovery to the CPU. Then, the CPU that has received the report indicating that the retention of the data transmission request queue is restored restarts the registration of the transmission data for the relevant line control module in the main storage unit.

In this way, the communication interface section notifies the CPU so that the CPU does not register the transmission data for the line control module, which is full or nearly full, in the data transmission request queue and transfers it to the main storage section. It is possible to prevent the waiting transmission data from accumulating.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a computer system according to the first embodiment of the present invention. The computer system is roughly classified into a host computer 100 that provides services to users and a user terminal 1
17-a, 117-b, 117-c, 117-d, each of the terminals 117-a, 117-b, 117-
Public communication network (or dedicated communication network) 116 to which c, 117-d are connected, and the host computer 100 and each terminal 11
7-a, 117-b, 117-c, 117-d. The multi-line communication control device 110 controls communication with the multi-line communication control device 110. Also, the host
The computer 100 includes the following components. CPU101
Performs communication processing to each terminal 117-a, 117-b, 117-c, 117-d. The main storage unit 102 has a communication buffer 103 for storing transmission data, and the CPU 101 and computer
Connected by bus 104. The communication interface unit 105 includes an MPU 106 and a communication buffer 107 inside and is connected to the computer bus 104. Here, the MPU 106
Performs processing for a data communication instruction command from the CPU 101, data transfer from the communication buffer 103 of the main storage unit 102 to the communication buffer 107 of the communication interface 105, and the like. Further, the communication interface unit 105 has a data transmission request queue retention monitoring table 108. The data transmission request queue retention monitoring table 108 is for monitoring whether the data transmission request queue is retained in the line control module. The multi-line communication control device 109 is composed of the following components. The computer interface module 110 includes a communication interface unit 1
Connected to 05. Line control module 112-a, 112-b, 112-
c is an MPU 113-a, a communication buffer 114-a, a data transmission request queue management table 115-a, and an MPU 113-b.
And a communication buffer 114-b and a data transmission request queue management table 115-b, an MPU 113-c, a communication buffer 114-c and a data transmission request queue management table 115-c, and the computer interface module 110 via an internal bus 111. Connected with. Here, the MPUs 113-a and 113-
b and 113-c perform processing for the data transmission request queue from the communication interface unit 105, data transfer from the communication buffer 107 in the communication interface unit 105, data transmission to the terminal, and the like. And each line control module
112-a, 112-b, 112-c perform line control with each terminal 117-a, 117-b, 117-c, 117-d connected to the public communication network (or dedicated communication network) 116. ..

FIG. 2 shows that when the data transmission request queue stays in the line control module in the computer system, the communication interface unit 105 controls the transmission data registration in the main storage unit 102 or resumes the registration by the CPU 101.
It shows the general procedure for making a request. The communication interface unit 105 in the host computer 100 periodically sends the data transmission request queue management tables 115-a, 115-b, 115-c in the line control modules 112-a, 112-b, 112-c. Access and access the data transmission request queue management table 11
Calculate the number of valid data transmission request queues for each 5-a, 115-b, 115-c. Then, the communication interface unit 105 compares the calculated value with the information of the data transmission request queue retention monitoring table 108, and as a result, the data transmission request queue is retained in the data transmission request queue management table of a certain line. If it is determined that it is, the CPU 101 is notified of that fact. Further, as a result of the comparison, if it is determined that the data transmission request queue that has been retained in the data transmission request queue management table of a certain line has been swept and retained, the CPU
Notify 101 to that effect.

In the CPU 101, the communication interface section 105
When the data transmission request queue retention report / retention recovery report is received from, the transmission data registration inhibition / restart processing for the corresponding line to the main storage unit 102 is performed according to the report content.

FIG. 3 shows the structure of the data transmission request queue retention monitoring table 108 that is referred to in the communication interface unit 105 when determining the retention status of the data transmission request queue in the data transmission request queue management table. Is. The data transmission request queue retention monitoring table 108 has the following components. The data transmission request queue retention determination constant 300 is a comparison constant for determining that the data transmission request queue is stored in the data transmission request queue management table. When the number of valid data transmission request queues in the data transmission request queue management table is larger than the data transmission request queue retention determination constant 300, the data transmission request queue is retained. The data transmission request queue retention recovery determination constant 301 is a comparison constant for determining that the data transmission request queue retained in the data transmission request queue management table has been swept. The number of valid data transmission request queues in the data transmission request queue management table is the data transmission request queue retention recovery determination constant 30
If it is less than 1, the data transmission request queue has not accumulated. Further, the data transmission request queue retention report / retention recovery report completion registration area 302 is stored in the data transmission request queue by the CPU 101 in the determination processing up to the previous time when the communication interface unit 105 determines the retention status of the data transmission request queue. This is an area for registering whether a report / retention recovery report is being made. Report on retention of data transmission request queue /
There are as many retention recovery reported registration areas 302 as there are lines connected to each line control module.

The communication interface unit 105 stores the data transmission request queue retention report / retention recovery report completion registration area.
When the content of 302 has already been reported as a queue retention report and it is determined that the data transmission request queue retention is present, the data transmission request queue retention is not reported to the CPU 101. If the contents of the data transmission request queue retention report / retention recovery report completion registration area 302 has already been reported as queue retention recovery and it is determined that the data transmission request queue retention is recovered, the CPU 101 does not report the data transmission request queue retention recovery. ..

FIG. 4 shows a data transmission request queue management table 115- for storing information on the data transmission request queue registered in the line control modules 112-a, 112-b, 112-c by the communication interface unit 105. It shows the format of a, 115-b, 115-c. The data transmission request queue management tables 115-a, 115-b, 115-c have the following components. The data transmission request queue registration number 400 represents the number of data transmission request queues registered in the data transmission request queue management table by the communication interface unit 105. The data transmission request queue registration number 400 is the communication interface unit 1
05 is added when registering the data transmission request queue in the line control module. The number of processing completion queues 401 represents the number of completed processings of the data transmission request queue received from the communication interface unit 105 by the line control module. The processing completion queue number 401 is added by the line control module when the processing for the queue is completed. The data transmission request queue registration area 402 is an area for storing a data transmission request queue registered by the communication interface unit 105 in the line control module.

Each data transmission request queue management table 115-
a, 115-b, 115-c are the line control modules 112-a, 112-b, 1
There are as many lines as connected to 12-c.

Hereinafter, with reference to FIGS. 5 and 6, the flow of the processing procedure for monitoring the retention status of the data transmission request queue and requesting the CPU to suppress / restart the transmission data registration in the main memory in the embodiment of the present invention. Will be explained.

In FIG. 5, in the communication interface unit 105, the retention status of the data transmission request queue in the data transmission request queue management table is discriminated, and the CPU 10 is determined according to the status.
Figure 1 shows the processing flow up to the queue retention report / retention recovery report.

The communication interface unit 105 in the host computer 100 periodically sends each line control module 112-
Data transmission request queue management table 1 in a, 112-b, 112-c
From 15-a, 115-b, 115-c, 40 data transmission request queue registrations
0 and the processing completion queue number 401 are read (500, 501), and the valid data transmission request queue number of the corresponding line is calculated from these values (502). Next, the data transmission request queue retention determination constant 300 of the data transmission request queue retention monitoring table 108 is read (503), and the calculated number of valid queues is compared with the data transmission request queue retention determination constant 300 (504). .. As a result of the comparison, when the number of effective queues is larger, the communication interface unit 105 reads the contents of the corresponding data transmission request queue retention report / retention recovery report completed registration area 302.
(505), it is determined whether or not the read content has been reported as a queue retention report (506). As a result of the determination, if the content has not been reported to be in the queue, the communication interface unit 105 determines that the CP
The retention report of the data transmission request queue to the corresponding line is reported to U101 (507), and if the read content is the queue retention report, the process is terminated.

As a result of the comparison, if the number of valid queues is smaller, the communication interface unit 105 reads the data transmission request queue retention recovery determination constant 301 (508), and the calculated number of valid queues and the data transmission request queue. The retention recovery discrimination constant 301 is compared (509). As a result of comparison with the data transmission request queue retention recovery determination constant 301, if the number of effective queues is smaller, the communication interface unit 105 reads the contents of the corresponding data transmission request queue retention report / retention recovery report completed registration area 302. (510), it is determined whether or not the read content has been reported as a queue retention recovery report (511). As a result of the determination, if the content is not already reported as the queue retention recovery, the communication interface unit 105 reports the data transmission request queue retention recovery of the corresponding line to the CPU 101 (512), and the read content is the queue retention recovery reported. If so, the process ends.

In this way, the communication interface unit 105
Determines the stay status of the data send request queue in the data send request queue management table 115-a, 115-b, 115-c of each line control module 112-a, 112-b, 112-c. CPU 101 is notified accordingly.

In FIG. 6, in the CPU 101, the retention report of the data transmission request queue from the communication interface unit 105 /
It is a processing flow chart when a retention recovery report is received.

CPU 101 in host computer 100
Upon receiving the retention report / retention recovery report of the data transmission request queue from the communication interface unit 105, the user analyzes the report content (600) and determines the report content (601). As a result of the determination, if the report content is the queue retention report, the CPU 101
Suppresses registration of transmission data for the corresponding line in the main storage unit 102 (602). Further, as a result of the determination, when the report content is the queue retention recovery report, the CPU 101 restarts the registration of the transmission data for the corresponding line in the main storage unit 102.
(603).

As described above, the CPU 101 suppresses / resumes the registration of the transmission data for the corresponding line in the main storage unit 102 according to the contents of the retention report / retention recovery report of the data transmission request queue from the communication interface unit 105. I do.

According to this embodiment, the communication interface unit in the host computer monitors the staying status of the data sending request queue in each data sending request queue management table of each line control module, and depending on the staying status. Since the fact is reported to the CPU, it is possible for the CPU to make the line in which the data transmission request queue stays wait for the transmission data to be registered in the main storage unit. As a result, the amount of data waiting to be transferred on the main storage unit can be reduced.

Further, from the communication interface unit to the CPU
Data transmission request queue retention report / retention recovery report to
Since it is performed only when the staying status changes, even when the queue staying state or the queue staying recovery state continues, it is possible to prevent the processing load of the communication interface unit and the CPU from increasing.

[0043]

According to the present invention, since the transmission data for the line in which the communication buffer of the line control module in the multi-line communication control device is full is not registered in the main storage unit, the memory of the main storage unit can be effectively used. In addition, even if data transmission requests for a line in which the communication buffer of the line control module has a poor sweep condition are concentrated, transmission data is not placed in the main storage unit. It is possible to prevent the processing load of the interface unit from increasing.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a computer system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic procedure for a communication interface unit to request the CPU to suppress or restart registration of transmission data in a main storage unit.

FIG. 3 is a configuration diagram of a table in the data transmission request queue management table, which is referred to when determining the stay status of the data transmission request queue.

FIG. 4 is a configuration diagram of a table that stores information related to a data transmission request queue registered in each line control module.

FIG. 5 determines the staying status of the data transmission request queue in the data transmission request queue management table, and determines the CP according to the status.
FIG. 7 is a process flow chart up to the queue retention report / retention recovery report to U.

FIG. 6 is a process flow chart when a stay report / stagnation recovery report of the data transmission request queue is received from the communication interface unit.

[Description of Reference Signs] 100 ... Host computer 101 ... CPU 105 ... Communication interface unit 106 ... MPU 108 ... Data transmission request queue retention monitoring table 109 ... Multi-line communication control device 112-a, 112-b, 112-c ... Line control module 115-a, 115-b, 115-c ... Data transmission request queue management table

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuji Ohno 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa, Ltd. Microelectronics Device Development Laboratory, Hitachi, Ltd. (72) Inventor Shoji Yamaguchi 5-2 Omika-cho, Hitachi-shi, Ibaraki No. 1 stock company Hitachi Ltd. Omika factory (72) Inventor Yoshimi Fujimata 5-2-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Process Computer Engineering Co., Ltd.

Claims (1)

[Claims] 1. A host computer comprising a CPU, a main storage unit, and a multi-line control device having a plurality of line control modules, and a communication interface unit for making a data transmission request to the line control modules. ,
In the line control module, means for storing a data transmission request queue received from a communication interface unit, means for storing the number of the data transmission request queues, and a queue in which processing for the data transmission request received from the communication interface unit is completed. And a means for storing the number of valid data transmission request queues stored in the line control module in the communication interface section, and a circuit for determining the number of valid data transmission request queues stored in the line control module. A means for detecting that the data transmission request queue is accumulated in the control module, and a means for detecting that the data transmission request queue retained in the line control module has been swept based on the number of the valid data transmission request queues. And the retention status of the data transmission request queue in the line control module is stored. The data in the line control module when the data transmission request queue retention in the line control module is detected when the stored retention state is in the non-retention state and when the stored retention state is in the retention state A retention monitoring method for a data transmission request queue, which is provided with means for notifying the CPU of the recovery of the retention of the transmission request queue.