JPH04349543A - Measuring system for program processing time - Google Patents

Abstract

PURPOSE:To easily and exactly measure how many percentages in the whole the processing time of a certain specific program occupies, in the case of controlling a device in accordance with a program by a microprocessor. CONSTITUTION:The system is provided with a counter 22 for measuring a specific program, and a counter 21 for measuring an execution time of the whole program. At the time of starting the measurement, the counters 21, 22 are reset from a microprocessor 26, and by inputting '1' to an EN1 terminal of the counter 21, it is operated. Only when a program 1 is being executed, '1' is inputted to an EN2 terminal of the counter 22, and the counter 22 is operated. When the measurement is finished, the operation of the counters 21, 22 is stopped by inputting '0' to the EN1 and the EN2, and by reading a result of counting of the counter 21 and the counter 22 by the microprocessor 26, a ratio of the execution time is calculated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the processing time of a program in a device controlled by a microprocessor.

0002

2. Description of the Related Art Conventionally, measuring what percentage of the execution time of a particular program occupies the execution time of a program is carried out as follows, as shown in FIG. First, the number of seconds it takes from the time the program 1 to be measured stored in the ROM 25 is started until it ends is measured in advance using an in-circuit tester or the like. Similarly, the number of times the periodic program M, which is stored in the ROM 25 and is activated periodically, is executed is determined in advance by writing it into the periodic program M so as to count each time the periodic program is executed, and the result is stored at address 42 of the memory 40. Hold. Further, the number of executions of the program 1 is similarly counted and stored at address 43 of the memory 40. The periodic program uses a timer circuit 3 that generates pulses at regular time intervals.
0 to microprocessor 26 interrupt input INT
When a pulse is input to 31 and the microprocessor 26 receives this interrupt input, it is activated at approximately regular intervals by executing a periodic program M written in the ROM 25. Therefore, if you know the number of times the periodic program M has been executed, you can know how many seconds have passed. For example, if periodic program M that starts every 100ms is executed 5 times, 100
This means that ×5=500ms have passed. During this time, program 1 is executed 5 times, and if it takes 10 ms from start to finish of program 1, program 1 will be executed for 10 x 5 = 50 ms, and its proportion to the total execution time will be 50 ms.
/500×100=10%. Thus, for example, if program 1 is a program to be executed when microprocessor 26 is idle and not doing any work, 1
The usage rate of the microprocessor is calculated by 00×(1-(time of program 1×number of times)/(time of periodic program×number of times)).

0003

[Problem to be Solved by the Invention] In this conventional method of measuring program processing time, programs that are started periodically are not necessarily started at regular intervals when other interrupt processing is started, so it is difficult to accurately measure program processing time. Unable to calculate microprocessor usage rate. Furthermore, since the program execution time must be measured using an in-circuit tester or the like, re-measurement is required each time the program is modified, which is time consuming.

0004

[Means for Solving the Problems] The method for measuring program processing time of the present invention is a method for measuring the total processing time of a program from the start to the end of measurement in a device in which a microprocessor performs control and data processing according to a program. a second counter that measures the execution time of a specified specific program; and a counter that reads the count values of the first counter and the second counter; and the execution time of the specific program relative to the total processing time of the program. and a means for calculating the ratio.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. The microprocessor 26 is usually built into a device, and in the case of a transmission device, for example, it executes processing such as data transmission/reception control and data editing according to the contents of a memory (ROM 25) in which a program is written. The microprocessor 26 executes programs 1 to N written in the ROM 25.
and periodic program M are executed, and the measurement of what percentage of the processing time of the specific program 1 occupies of these execution times is performed as follows.

[0007] The counter (CNT) used for time measurement is
With counter (CNT) 21 and counter (CNT) 22,
The CNT 21 is used to measure the total processing time, and the CNT 22 is used to measure the execution time of the program 1. For example, when measuring the rate at which program 1 is executed between the execution of periodic program M and the next execution of periodic program M, first
A reset pulse is output from the I/O port of the microprocessor 26 to the RST1 and RST2 terminals of CNT22, and CNT21 and CNT22 are cleared to '0'. Then, '1' is output to EN1 of CNT21. CNT21 and CNT22 are equipped with a clock circuit (CL).
If clock pulses are being supplied from K) 27 and '1' is input to the count valid terminals EN1 and EN2, the clock pulses are counted. When the EN1 and EN2 inputs are '0', counting stops and the values counted up to that point are held. The microprocessor 26 outputs '0' to the EN2 terminal of CNT2,
Leave the counter at '0'.

Next, when the program 1 is activated, the microprocessor 26 outputs '1' to the EN2 terminal of the CNT 22 and starts the counting operation of the CNT 22. At the end of program 1, microprocessor 26
Output '0' to EN2 of T22 and stop the counting operation. When the program 1 is started again next time, the counting operation of the CNT 22 is restarted in the same manner.

When the periodic program M is started again in this manner, the microprocessor 26 outputs '0' to the EN1 and EN2 terminals of the CNT 21 and CNT 22, and the counting operation is stopped. The microprocessor 26 outputs the time from the start to the end of the measurement to the count output terminal OU of the CNT 21.
T1 is read through the gate 23, and the number of seconds that the program 1 was executed during the measurement time is read from the count output terminal OUT2 of the CNT 21 through the gate 24. Then, by dividing the value read from CNT22 by the value read from CNT1, it can be determined what percentage of the program execution time the program 1 occupies.

0010

Effects of the Invention As explained above, the present invention provides two counters for time measurement, one for measuring the total processing time and one for measuring the execution time of a specific program. Since the counter is activated and the count result can be read by a microprocessor, it is easy to determine the percentage of a particular program's overall execution time. Therefore, the usage rate of the microprocessor can also be calculated accurately. In addition, since it can be measured for each program, if the usage rate is high, it is easy to measure which program is taking time, and it can also be used as a debugging tool.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a block diagram of an example of a conventional method for measuring program processing time.

[Explanation of symbols]

21, 22 Counter (CNT) 23, 24
Gate 25 ROM (memory) 26 Microprocessor 27 Clock circuit (CLK) 30 Timer circuit 40 Memory

Claims (1)

[Claims] Claim 1: A device in which a microprocessor performs control and data processing according to a program, comprising a first counter that measures the total processing time of the program from the start of measurement to the end of the measurement, and a first counter that measures the execution time of a specified specific program. a second counter that reads the count values of the first counter and the second counter and calculates a ratio of the specific program execution time to the total processing time of the program. Processing time measurement method.