JPH1011333A - Measuring instrument for cpu use rate by task - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure execution times by tasks and accurately find the use rate of a CPU even when the operation clock of the CPU is changed. SOLUTION: This instrument has the CPU 1 which executes tasks identified with IDs, an execution-time-by-task storage part 6 having a storage area wherein the execution times by the tasks can be stored by the IDs, a clock generation part 4 which generates reference clock pulses for measurement when the execution times of the respective tasks are measured, and a totalizing means 5 which totalizes the execution times of the tasks within a certain time calculated from the reference clock pulses for measurement by the storage areas of the storage part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CPU (Central P
CPU that measures the usage rate of each (rocessing Unit) for each task
It relates to a utilization measuring device.

[0002]

2. Description of the Related Art Conventionally, a CPU for measuring a CPU usage rate
Utilization rate measuring devices include those described in JP-A-60-27960 and JP-A-63-269239.

A CPU utilization measuring device described in Japanese Patent Application Laid-Open No. Sho 60-27960 repeatedly executes an instruction whose execution time is known when the CPU is idle, and counts the number of executions of the instruction within a predetermined time. Thus, the idle time is obtained and the CPU utilization is measured accordingly.

A CPU utilization measuring device described in Japanese Patent Application Laid-Open No. 63-269239 discloses a task number storage register for storing a task number being executed by a CPU, and a counter for starting a counter by judging a task number. The apparatus includes a device and a device for writing a task number being executed to the task number storage register when a task is started by a system program.

[0005]

In the former, when the CPU is idle, an instruction whose execution time is known is repeatedly executed, and the instruction time is obtained as an idle time from the number of executions of the instruction within a predetermined time.

Therefore, when the operation clock of the CPU is changed, the program execution speed of the CPU changes. Therefore, unless the method of measuring the idle time is changed for each different operation clock, the accurate execution time of the task cannot be calculated.

In the latter, the execution time of the entire CPU or only one specific task can be measured, and the execution time of each task cannot be measured.
There is a disadvantage that the U usage rate cannot be determined.

According to the present invention, there is provided a CPU capable of measuring the execution time of each task, and accurately determining the usage rate of the CPU even when the operation clock of the CPU is changed. It is an object of the present invention to provide a utilization measuring device.

[0009]

According to a first aspect of the present invention, there is provided an apparatus for measuring CPU utilization by task, which stores a CPU for sequentially executing a plurality of tasks identified by IDs, and an execution time of each task for each ID. A task-specific execution time storage unit 6 having a storage area capable of performing the task, a clock generation unit 4 for generating a reference clock pulse for measurement as a reference when measuring the execution time of each task, and indexing from the reference clock pulse for measurement And a counting means 5 for counting the execution time of each task within the fixed time for each storage area of the execution time storage unit for each task.

According to a second aspect of the present invention, in the above-described configuration, the CPU usage rate of each task is based on the execution time of each task stored in the execution time storage section for each task. Is provided with a CPU usage rate calculating means 1 for calculating the ratio. The task-specific CPU usage rate measuring device according to claim 3, wherein the CPU usage rate calculating means 1 comprises:
By dividing the execution time for each task stored in the task-specific execution time storage unit 6 by the above-mentioned fixed time, the CPU usage rate for each of these tasks is calculated.

[0011]

Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the apparatus of the present invention includes a CPU 1 for sequentially executing a plurality of tasks programmed for each function, a task ID unit 2 in which a task ID of a task being executed by the CPU 1 is written, and a usage rate of the CPU 1. A control register 3 for setting permission or prohibition of measurement;
It has a clock generation unit 4, a decoder 5, and a task-specific execution time storage unit 6.

The clock generator 4 generates a reference clock pulse for measurement having a constant frequency which is used as a reference when calculating the usage rate of the CPU 1 irrespective of the change of the operation clock of the CPU 1.

The execution time storage unit for each task 6 has a storage area for storing the execution time of each of the 256 tasks identified by the task IDs # 0 to # 255, for example.
The execution time of a plurality of tasks sequentially executed by U1 can be stored for each task ID.

[0014] The decoder 5 is provided for a predetermined time (for example, one minute) determined based on a measurement reference clock pulse (for example, 100 μs) generated by the clock generator 4.
This is a counting means for counting the execution time of each task executed by the CPU 1 for each storage area of the execution time storage unit 6 for each task.

Specifically, within the above-mentioned fixed time (1 minute) set by a software timer that operates on the basis of the measurement reference clock pulse, in synchronization with the measurement reference clock pulse generated by the clock generator 4. , Task I
The task IDs are sequentially read from the D unit 2, and the storage area of the task identified by the read task ID is incremented.

The CPU 1 controls the entire apparatus,
Based on the execution time for each task stored in the execution time storage unit 6 for each task, a function (CPU usage calculating means) for calculating the CPU usage rate for each task is provided.

Specifically, by dividing the execution time of each task stored in the execution time storage unit 6 for each task by the same fixed time (1 minute) as described above, the CPU usage rate of each task is divided. Is calculated.

The processing operation for switching the task from the initial setting will be described with reference to the flowchart shown in FIG. When the power is turned on or the reset operation is performed, the process proceeds to step a1. Step 1 (indicated by a1 in the figure; the same applies hereinafter): A setting for prohibiting the measurement of the execution time for each task is made in the control register 3.

Step 2: The storage area of the task-specific execution time storage section 6 is cleared for all tasks. Step 3: Write the task ID of the task to be executed first in the task ID section 2.

Step 4: The control register 3 is set to permit measurement of the execution time of each task. Step 5: Start a software timer for measuring the execution time. This software timer is
As described above, since it is based on the measurement reference clock pulse generated by the clock generation unit 4, a constant time can always be calculated regardless of the change of the operation clock of the CPU 1.

Step 6: Control is transferred from the real-time monitor on the basic software to the task to be executed first. Step 7: When an event for switching tasks occurs, the process proceeds to step 8. Step 8: The control is transferred to the real-time monitor, the priority and the state of the task are determined to determine the next task to be executed, and the task ID of the task is written to the task ID section 2. Step 9: While transferring control to the task, return to step 7 and wait for occurrence of an event for switching the task.

Next, the processing operation for calculating the CPU usage rate for each task will be described with reference to the flowchart shown in FIG. When a timeout of a predetermined time for calculating the usage rate of the CPU 1 occurs, the process proceeds to step b1, and a setting for prohibiting the measurement of the execution time is made in the control register 3. Step b2: The execution time storage unit 6 for each task is set to the read permission state, and the execution times of all the tasks stored in its storage area are read.

Step b3: The usage time of the CPU 1 for each task is calculated by dividing the execution time for each task by a fixed time (1 minute).

Step b4: Task-specific execution time storage unit 6
Clear all storage areas of. Step b5: After setting to permit the measurement of the execution time for each task is performed for the control register 3, the program returns to the original program.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the invention. In the above description, an example was described in which the execution time of each task was divided by a certain time to calculate the CPU usage rate of each of the tasks. The overall usage rate may be calculated.

[0026]

According to the first to third aspects of the present invention,
Since the execution time of each task within a certain time period determined from a measurement reference clock pulse having a certain frequency is separately measured, the execution time of each task can be measured. Even when the clock is changed, the execution time of each task can be accurately obtained without changing the measurement method.

According to the second aspect of the present invention, since the CPU usage rate of each task is calculated based on the measured execution time of each task, the CPU usage rate can be changed without changing the calculation method. Can accurately determine the usage rate.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a task-specific CPU usage rate measuring device as one embodiment of the present invention.

FIG. 2 is a flowchart showing a series of processing operations for switching a task from an initial setting.

FIG. 3 is a flowchart illustrating a processing operation for calculating a CPU usage rate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU (CPU usage rate calculation means) 4 Clock generation part 5 Addition means (decoder) 6 Task-specific execution time storage part

Claims (3)

[Claims] 1. A CPU for sequentially executing a plurality of tasks identified by IDs, a task-specific execution time storage unit having a storage area capable of storing the execution time of each task for each ID, and execution of each task. A clock generation unit that generates a measurement reference clock pulse that is a reference when measuring time,
And a counting means for counting the execution time of each task within a certain time determined from the measurement reference clock pulse for each storage area of the execution time storage unit for each task. . 2. Based on the execution time of each task stored in the execution time storage unit for each task, C
2. The task-specific CPU utilization measuring device according to claim 1, further comprising a CPU utilization calculating means for calculating the PU utilization. 3. The CPU usage rate calculating means calculates the CPU usage rate of each task by dividing the execution time of each task stored in the execution time storage unit for each task by the predetermined time. 3. The CPU according to claim 2, wherein
Utilization measurement device.