JPH01112460A - System for controlling input and output - Google Patents

Abstract

PURPOSE:To remove a defect that the input and output request of low priority is waited for a long time by obtaining correcting function to judge residence allowance to priority control. CONSTITUTION:A request reception means 3 extracts priority control information by the input and output request of a processing program 1. These information are delivered to a priority control means 4 and entered to a priority control table 7 according to the priority of the information. Namely, a request cue address, the priority and a residence time are registered and the resetting request of the residence time and the judgement of the residence allowance are requested to a residence allowance judging means 5. The means 5 re-computes the setting residence time of the entry of the control table 7 and resets it and whether the time in the allowing time of the entry or not is judged. When it is not in the allowing time, the position of the entry of the control table 7 is moved to a head side according to the residence time. This operation is repeated for all entries. When the input and output request is received from the means 4, a request issuing means 6 removes the top entry of the control table 7 and the input and output request is issued to an input and output device 8. Thus, the defect that the input and output request of the low priority is waited for a long time is removed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an input/output control method for a computer system.

[Conventional technology]

Conventional priority control input/output control is performed according to the priority of a processing program, the seek address of a magnetic disk device, or the like.

[Problem that the invention seeks to solve]

The above-described conventional priority control input/output control method has the disadvantage that when high-priority input/output requests occur frequently, low-priority input/output requests are forced to wait for a long time. An object of the present invention is to provide an input/output control method that eliminates the above-mentioned drawbacks by providing priority control with a correction function of determining whether or not to allow retention.

[Means for solving problems]

The input/output control method according to the present invention includes a request accepting means, a priority controlling means, a retention permission determining means, and a request issuing means, and is configured to manage the order of input/output requests using a priority control table. This is what I did. The request receiving means receives an input/output request from a processing program that performs various processes, extracts priority control information from the received input/output request, passes the priority control information and request contents, and issues an input/output request. The priority control means receives the priority control information and the request content from the request reception means, registers an entry in the priority control table according to the priority of the priority control information, and issues a residence time resetting request and residence permission. Requires judgment. The means of determining the permissibility of residence are as follows:
Receives a residence time reset request and a residence permission judgment request from the priority control means, recalculates and resets the residence time of the entry set in the priority control table, and sets the residence time in the priority control table. If it is not within the permissible time, the entry position in the priority control table is moved to the top according to the retention time, and if it is within the permissible time, the entry is moved to the top of the priority control table. The request issuing means repeats this operation for all entries in the priority control table, and in response to the input/output request from the priority control means, the request issuing means performs input/output from the first entry of the priority control table to the input/output device. Issue a request.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Referring to FIG. 1, one embodiment of the present invention includes a processing program 1, an input/output control device 2, a request receiving means 3, a priority control means 4, a retention permission determining means 5, and a request issuing means 6.
, a priority control table 7, and an input/output device 8.

Referring to FIG. 2, the priority control table 7 includes a request queue address, a priority, an allowable residence time, and a residence time.

Next, the operation of one embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1 and FIG. 3, the request receiving means 3:
It receives input/output requests from the processing program 1 that performs various processes, and extracts priority control information from the received input/output requests (step 21). The extracted priority control information and request contents are passed to the priority control means 4, and an input/output request is made. The priority control means 4 receives the priority control information and the request contents from the request reception means 3, and makes an entry in the priority control table 7 according to the priority of the priority control information, that is,
The request queue address, priority, and allowable stay time are registered (step 22), and the stay allowable determining means 5 is requested to reset the stay time and determine whether to allow the stay.

The residence permission judgment means 5 receives the residence time resetting request and the residence permission determination request from the priority control means 4, and recalculates the residence time of the entry set in the priority control table 7 and resets it. Step 23), it is determined whether the retention time is within the allowable time of the entry set in the priority control table 7 (step 24), and if it is not within the allowable time, the retention time is determined according to the priority control table 7. The position of the entry in the priority control table 7 is moved to the head side (step 25), and if it is within the allowable time, it is left as is, and this operation is repeated for all entries in the priority control table 7 (step 26). Upon receiving the input/output request from the priority control means 4, the request issuing means 6 extracts the contents of the first entry of the priority control table 7 (step 27);
Issue an input/output request for that entry to the input/output device 8 (
Step 28).

[Effects of the Invention] As described above, the present invention has the advantage that even if high-priority input/output requests occur frequently, low-priority input/output requests are processed without being left behind.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the input/output control method of the present invention,
FIG. 2 is a diagram showing the structure of the priority control table means 7 of FIG. 1;
3 is a diagram showing the flow of operation of the input/output control device 2 of FIG. 1. In FIG. 1, 1...processing program, 11-1n...
・Processing program, 2...Input/output control device, 3
. . . Request receiving means, 4 . . . Priority control means, 5 .
・Request issuing means, 7...Priority control table, 8...
...Input/output device, 81-8n...Input/output device. Agent: Patent Attorney Shinkan Uchihara 1 time

Claims (1)

[Claims] An input/output control method having a priority control function in a computer system that centrally controls input/output requests from multiple processing programs, the method comprising: a request accepting means for extracting control information and passing the priority control information and request contents to make an input/output request; and receiving the priority control information and the request contents from the request accepting means, and transmitting the priority control information a priority control means for registering an entry in a priority control table according to the priority and requesting a residence time reset request and a residence permission determination; Upon receiving the judgment request, recalculate the residence time of the entry set in the priority control table, determine whether the residence time is within the permissible time of the entry set in the priority control table, and calculate the permissible time. If it is not within the allowable time, move the entry position in the priority control table to the top according to the residence time, and leave it as it is if it is within the allowable time;
retention permission determining means for repeating this operation for all entries in the priority control table; and input/output from the first entry of the priority control table to the input/output device in response to an input/output request from the priority control means. An input/output control method for priority control, comprising: request issuing means for issuing requests, and configured to manage the order of input/output requests using the priority control table.