JPS6010343A - Time slice value control system - Google Patents

Abstract

PURPOSE:To reduce the number of times of running of a resource managing routine when the load of a system is low as batch processing and the guarantee of response is not required by changing a time slice value of the resource managing routine based on a task attribute. CONSTITUTION:A resource managing section 1 reads an attribute area S and a resource using state area R of task tables 3A-3M of a task managing section 3. When a task requiring the guarantee of the response of a CPU such as on- line exits, a TSV decision circuit 1-2 decides a TSV to a minimum value Tmin and transmits it to a time division control section 5. Further, a priority decision circuit 1-1 decides the priority of tasks A, B-M by the task attribute and resource use data, describes the priority to a priority area P of at ask table, and data are executed by an execution section 4. After the Tmin is elapsed, the resource managing section 1 outputs a timer interruption signal IT, the task requiring the guarantee of the response is reviewed and when it is not required, an increment alpha is fed to the TSV.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a time slice value control method for controlling a time slice value in a resource management routine so as to be variable based on the attributes of a task being executed at that time.

[Conventional technology and problems]

In a data processing device, a plurality of tasks are sequentially performed in a time-sharing manner, and data processing is executed as if a plurality of tasks were being performed at once.

The O8 monitors and controls the operating status of each of these tasks. Priorities are set to determine the order of the tasks, and system resources are allocated to tasks with higher priorities. . When determining this allocation, a program called a resource management routine checks the resource usage status of each task at regular intervals, and also refers to this to determine the priority of the task. Note that the resources here include, for example, a CPU, a main storage device, an external storage device such as a DASD (hereinafter referred to as I10), and the like. Tasks that use a large amount of CPU are given low priority because they have a large impact on other tasks, and tasks that use a large amount of Ilo are given low priority because they have little impact on other tasks. Management is performed by giving higher priority to items that are used more frequently.

Conventionally, this resource management routine generates an interrupt IT at regular time intervals to and checks the resource usage table D of each task W1 to wn, as shown in FIG.
While referring to the usage status of each resource collected by this,
For example, the priority of the task is W+, % -Wrn -W
From rL, W2. In this case, the time slice value for checking the resource usage table D is fixed at a constant time of 1o, and remains constant even when the system load fluctuates greatly.

In other words, even when an operation mode is adopted in which control is performed using an online system, TSS system, etc. during the day, and only a patch processing system is used during the night, the slice f speed remains constant.

Therefore, in cases where guaranteed responsiveness is not required, such as in batch processing, the slice value of the resource management routine is set to a large value, and in cases where guaranteed responsiveness is required, such as in online processing, the slice value is set to a large value. If the value can be set to a small value as before, when the guarantee of responsiveness is not so necessary, K is required to increase the slice value of the resource management routine to reduce the running overhead as much as possible.

[Purpose of the invention]

An object of the present invention is to provide a time slice value control method in which the size of such a time slice value is made variable depending on the attributes of the task being executed at the time.

[Structure of the invention]

In order to achieve this objective, the time slice value control method of the present invention is provided with a material usage state holding means for recording the state in which the material is used by a task, and a priority determining means for determining the priority order of a plurality of tasks. In the data processing device, a time slice value determining means is provided to determine a time slice value by detecting the attributes of a task and determining whether or not a task that requires guaranteed responsiveness is being executed. The present invention is characterized in that the time slice value when executing a task is increased when executing a task that does not require guarantee of responsiveness.

[Embodiments of the invention]

An embodiment of the present invention will be described based on FIGS. 2 to 4.

Fig. 2 is a configuration diagram of an embodiment of the present invention, Fig. 3 is an explanatory diagram of the variable state of the time slice value, and Fig. 4 is a flowchart explaining the operating state of the present invention.In the figure, 1 is resource management 2 is a judgment condition 90 section, 3 is a task management section, 4 is a task execution section, and 5 is a time division control section.

The resource management unit 1 changes the V time slice value that determines the priority of each task by looking at the attributes and resource usage status of each task A, B...M, and the priority determination circuit 1-1.
and a time slice (TSV) determination circuit 1-2.

The judgment condition section 2 holds data for determining the priority order and TSV value of each task in the resource management section 1, such as the algorithm for determining the priority order, the attribute for responsiveness, the maximum value of TSV, The minimum value, TSV increase value α, etc. are held.

The task management unit 3 not only holds tasks A, B...M, but also creates task tables 3-A, 3-B...3-M for each task A, B...M, respectively. establish.

Each task table includes an attribute area S where the attributes of the task are written, a resource usage status area R where the usage status of each resource such as the CPU, memo IJ, DASD, etc. is written, a priority area P that shows the priority of the task, etc. is provided.

The task execution unit 4 executes the task passed from the task management unit 3.

The time division control section 5 outputs an activation timing signal for the resource management section 1.

Next, the operation of the present invention will be explained.

(1) The resource management unit 1 reads the attribute area S and the resource usage status area R of the task tables 3-A to 3-M of the task management unit 3. At this time, the task that operates in the online method is
, the attribute area S of the CPU is checked to see if there is a task that requires guaranteed responsiveness within a certain period of time, and if there is such a task, the TSV determination step Ml-2
V is determined to be the minimum value T (4), and the determined TSV is sent to the time division control unit 5. In addition, the priority order determination circuit 1-1 determines whether the tasks A, B,
. . . Determine the priority order of M, and enter this priority order in the priority region P of each task table. Task management section 3
is assigned to each task A based on this priority order.

B...M are sequentially passed to the task execution unit 4, and thus masks A, B...M are sequentially executed in a time-sharing manner.

(2) And the TSV determined in the TSV determination round Ml-2
When the minimum value Tm1rL has elapsed, the time division control unit 5 outputs a start timing signal, and the resource management unit 1 outputs a timer interrupt signal IT, and updates the attribute area S and resource usage status area R of each task table. If there is a task that requires readout and guaranteed responsiveness, the TSV is held at the minimum value Tm1n, and a new priority order is determined by looking at the resource usage status area R. Then, the new priority order is written in the priority order area P, and the task management section 3 sends the task to the task execution section 4 and the task is executed.

(3) By the way, when the task is changed to, for example, patch processing at time T1 in FIG.
It is determined by the SV determining circuit 1-2. Due to this, the SV determining circuit 1-2 reads the TSV increase value α from the judgment condition unit 2 and changes the TSV value from 'fmirL to 'frnil+α.
○ This time, after TmLrL 10α has elapsed, the time division control unit 5 outputs an activation timing signal, and the resource management department outputs an interrupt signal ITt: and the attribute area S of the task table
, read out the resource usage status area R, etc.

(4) At this time, if it is still only a task that does not require guarantee of responsiveness, the TSv determination circuit 1-2 further increases the value of TSV by +α to TmtTL-1-2α.

'pmLtL-1-3α and +α every time the attribute area S is read. Then, the time T at which this value reaches the maximum value Tmax of TSV sent from the judgment condition section 2 is this Tm
Output ax as a TSV value.

(5) If there is a task that requires responsiveness guarantee again at time T4, it will be read at time T6, so the TSV
The decision circuit 1-2 will change TSV to its minimum value Tm1n.

In this way, the time slice value can be variably controlled according to the attributes of the task, so the running state of the resource management routine can be adjusted and the load on the CPU can be reduced.

〔Effect of the invention〕

According to the present invention, the time slice value of the resource management routine can be changed based on the attributes of the task. Therefore, when the system load fluctuates greatly, such as during patch processing or online processing, by using the same time slice value when the load is low as when the load is high, the running of resource management routines can be caused by an increase in the CPU load. The disadvantage of this is that it is possible to reduce the number of runs of this resource management routine when guaranteeing responsiveness is not required.
The load on the PU can be reduced.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the running state of a conventional resource management routine;
The figure is a configuration diagram of an embodiment of the present invention, Figure 3 is an explanatory diagram of the variable state of the time slice value, and Figure 4 is a flowchart explaining the operating state of the present invention.Patent applicant Fujitsu Ltd. Patent attorney Yama Akira Tani

Claims (1)

[Claims] In a data processing device equipped with a material usage state holding means for recording the state in which materials are used by a task, and a priority determination means for determining the priority order of multiple tasks, it is possible to detect task attributes and guarantee responsiveness. A time slice value determining means is provided to determine the time slice value by checking whether the required tasks are being executed, and the time slice value determines the need for ensuring responsiveness, rather than determining the time slice value when executing a task that requires guaranteed responsiveness. A time slice value control method characterized by increasing a time slice value when executing a task that does not have a time slice value.