JPS63269239A - Processor load measuring system - Google Patents

Abstract

PURPOSE:To reduce the load on a CPU and to improve the measurement precision by providing a counter which measures the time, when the CPU is used, of a fixed time and a counter which measures the time when the CPU is used by a specific task. CONSTITUTION:A system program writes the task number of a task to a task number storage register 6 at the time of starting this task, and a comparator 8 compares the contents of a task number setter 7 and the task number storage register 6 with each other, and a counter 9 is started to measure the execution time of this task if they coincide with each other. A comparator 10 compares the contents of the task number storage register 6 with 0, and a counter 11 is started if it is not 0. After the measuring time elapses, a CPU (central processing unit) 1 reads out counted values of counters 9 and 11 by the interruption of a timer 2 to calculate the used rate of the CPU 1 in the fixed time and the used rate of the CPU 1 for the measured task which is the time when the CPU 1 is used by the specific task.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides C
This relates to measuring the usage time of the PU and measuring the load on the CPU.

[Conventional technology]

FIG. 4 is a block diagram showing the configuration of a conventional processor load measurement method. In the figure, 1 is the CP (Central Processing Unit), 2 is the timer (TIMIiFL) that generates an interrupt at regular intervals, and 3 is the EL that stores the program.
OM (read-only memory), 4 is a for storing data etc.
It is AM (Random Access Memory).

FIG. 5 is a flowchart for explaining the operation of the processor load measuring method shown in FIG.

Next, the operation of the conventional processor load measurement method shown in FIG. 4 will be described. Timer 2 generates an interrupt for CPolj at fixed time intervals. Then, C.P.
U1 moves the processing to the beginning of the interrupt processing program in ROM3. In the processing operation according to the flowchart shown in FIG. 5, when the timer 2 generates an interrupt to the CPUI at regular intervals, 1 is first added to the time count variable i. Next, if the task is currently running, add 1 to the execution time count variable j of all tasks, and if the task is not currently running, proceed to the 5th processing step. If i exceeds the set value, the process proceeds to the next processing step, and if the time count variable i does not exceed the set value, this routine is exited and control is transferred to the system program.

The above operations are repeated at regular intervals. Then, we know that a certain amount of time has passed since the one-hour count variable i exceeds the set value, and after the certain period of time has elapsed, we use the time count variable i to calculate the number of task operations, which is the execution time count variable j for all tasks. By dividing by some elapsed time count number.

Calculate the load factor of CPtJl within that time, and then
Initialization is performed by setting both the time count variable i and the execution time count variable j of all tasks to 0.

[Problems that pronunciation attempts to solve]

Since the conventional processor load measurement method described above is configured as described above, there is a problem in that it is difficult to accurately measure the load because the number of task operations is measured by sampling over a fixed period of time. In addition, in order to improve measurement accuracy, it is necessary to make the sampling period faster, and if the sampling period is made faster in this way, the CPU
There was a problem that the load on 1 increased.

The present invention was made to solve these problems, and it provides a processor that improves measurement accuracy, reduces the load on a process for measuring load, and makes it possible to measure the usage rate of each task. The purpose is to obtain a load measurement method for

[Means for solving problems]

A processor load measurement method according to the present invention is as follows.

A task number storage register for storing the number of the task being executed, and a device for determining the task number and starting a first counter and a second counter are provided, and the first counter measures the usage time of the CPLI for a certain period of time. The counter to be measured is a counter that is activated when the task number is other than O, and the second counter is a counter that is activated when the task number is other than O.
The counter for measuring the usage time of U is configured to be activated when the system program writes a number that matches the set task number.

[Effect]

In the processor load measurement method of the present invention, two counters are provided, the first of which is used as a counter to measure the CPU usage time for a certain period of time, and the second counter is used to measure the CPU usage time by a specific task. Use as a counter to measure usage time. When the system program starts the YoQ task, it outputs the information of the starting task, determines the task number, and starts the counter. When the task is completed, the system program outputs the task number 0 to measure the hardware load.

〔Example〕

FIG. 1 is a block diagram showing the configuration of a processor load measuring method according to an embodiment of the present invention.

In the figure, each reference numeral 1 to 4 is the same as the conventional system shown in FIG. Further, 5 is a counter reset circuit, which performs a function of sending a reset signal to a counter 9 and a counter 11, which will be described later, in response to a command from the CPU 1 before starting measurement. A task number storage register 6 records the task number, and has the function of holding the currently activated task number output by the system program. 7 is a task number setting device that sets the task number to be measured using a lip switch (not shown); 8 is a comparator that compares the task number to be measured with the currently executing task and outputs an output if the two match; A counter 9 measures the execution time of the task being measured, which is activated by the output of the comparison 58 and counts the execution time only of the task being measured. IO is a comparator that determines the waiting state and execution of a task, and outputs a start signal when the task number output by the system program is other than O when the execution time of all tasks is counted t 6 f,-.

A counter 11 counts the execution time of all tasks, and is activated by the output of the comparator 10 to measure the execution time of all tasks. A clock generator 12 generates a reference clock to be supplied to each counter 9,11.

FIGS. 2 and 3 are flowcharts for explaining the operation of the processor load measurement method shown in FIG. 1, and diagrams showing the timing of the operations of each part.

The operation of the processor load measuring method shown in FIG. 1, which is an embodiment of the present invention, will be described below. Before starting measurement with the system program, the reset circuit 5 sends a reset signal to each counter 9.11 according to a command from the CPUI. Each counter 9.11 is initialized to 0 by a reset signal.

Next, a measurement time is set in timer 2 using the system program. Next, when the system program starts the task,
Write the activation task number to the task number storage register 6. A comparator 8 compares the contents of the task number setter 7 and the task number storage register 6 in order to compare the task number to be measured with the task currently in progress. If the two match, the comparator 8 outputs an output and sends an output to the counter 9. Start. A counter 9 measures the execution time of the task being measured. A comparison 610 compares the task number storage register 6 and O, and if it is greater than or equal to %θ, that is, when the task number output by the system program is other than 0, an activation signal is output and the counter 11 is activated. It is assumed that the system program writes a task number into the task number storage register 6 each time a task is switched, and also writes 0 to the task number storage register 6 when there is no activated task. After the measurement time has elapsed, CPU 1 reads the count numbers of each counter 9 and 11 by an interrupt from timer 2, and calculates the CPU count within a certain period of time.
Calculate the usage rate of U 1 and the usage rate of CP [Jl of the measurement task, which is the usage time of CP (Jl) by a specific task, respectively.

In the above embodiment, the task number setting device 7 is set externally, but the task number setting device 7 may not be set externally but may be input from the CPU 1.

〔Effect of the invention〕

As explained above, in the processor load measurement method, the present invention includes a task number storage register that stores the number of the task being executed, and a first register that determines the task number and measures the usage time of CP[J for a certain period of time. Since the configuration includes a device that starts a counter and a second counter that measures the CPU usage time for a specific task, it is not possible to measure the number of task operations by sampling over a fixed period of time, as in conventional examples of this type. Compared to what you are doing.

It has the excellent effect of reducing the load on the CPU because no interrupts occur at regular intervals, and improving measurement accuracy because the clock frequency can be made higher than the software sampling period. be.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a schematic diagram showing the configuration of a processor load measurement method according to an embodiment of the present invention, and FIGS. 2 and 3 show the processor load f11 determination shown in FIG. A flowchart for explaining the operation of the system and a diagram showing the timing of the operation of each part, Figure 4 is a block diagram showing the configuration of the conventional process load measurement system, and Figure 5 is a diagram showing the configuration of the conventional process load measurement system. It is a flowchart for explaining the operation of the load measurement method. In the figure, 1...CPLI (central processing unit), 2
..., timer (TIMER), 3...R, OM (read-only memory), 4. ,,RAM (random access memory)% 5... Reset circuit% 6... Task number storage register, 7... Task number setting 6. s, to
. . . Comparator, 9.11 . . . Counter, 12 . . . Clock generator. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A task number storage register that stores the number of the task being executed and a device that determines the task number and starts a counter are provided, and the system program writes the number of the task being executed to the task number storage register when the task is started. A processor load measuring method characterized by comprising a device for performing the function.