JPS6248866B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a computer instruction execution time measurement device, particularly for use in combination with automatic control systems, sensors, etc. that are controlled by computer instructions and require accurate operation. The present invention relates to an instruction execution time measurement device that can automatically measure the instruction execution time of a computer that is required to operate these instructions faithfully.

Conventionally, the following two methods are known as methods for measuring the instruction execution time of a computer.

The first method is to prepare a program that repeatedly executes the instruction to be measured and a program in which only the instruction to be measured is removed from this program, and have the test specimen computer execute these two programs separately. , the execution time of the instruction to be measured is calculated by measuring the execution time of both programs using a time measuring device such as a stopwatch, finding the difference between the execution times of both programs, and dividing this by the number of repeated executions. It is. According to this method, manual measurement using a stopwatch is possible, but it is necessary to increase the number of program executions to reduce measurement errors, and even if you try to increase the accuracy by increasing the number of repetitions, the computer instructions Since there are generally tens to hundreds of types, there is a drawback that the time required to measure all of these instructions increases accordingly.

The second method is to run the two programs described in the first method on each test specimen computer,
This method determines the execution time using an interval timer (internal clock) inside the computer under test. According to this second method, it is possible to automatically measure the instruction execution time, but the clock that is the reference clock for the computer's interval timer is usually the same as the clock for executing the instructions. Therefore, if an error occurs in the clock, the error directly affects both the instruction execution time and the interval timer that is the measurement standard, resulting in a decrease in measurement accuracy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a computer instruction execution time measuring device which eliminates the above-mentioned drawbacks and is capable of automatically measuring the execution time of an instruction to be measured with high precision and high speed.

The computer instruction execution time measuring device of the present invention transfers a program of a computer under test consisting of a program not including an instruction to be measured and a program including an instruction to be measured from a computer for measurement to a computer for a test object. and execute the measurement program in the measurement computer and the program of the test object computer in synchronization, so that both a program not including the instruction to be measured and a program including the instruction to be measured are executed. Measure the execution time of the program, calculate the execution time of the measured instruction from the difference in execution time of both programs and the number of executions,
The present invention is characterized in that the execution time of the instructions of the computer under test is automatically measured, and the execution time per arbitrary number of executions can be determined.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a flowchart showing programs for a specimen computer and a measurement computer used in the embodiment of FIG. The measurement computer 1 loads the test object computer program 22 to the test object computer 2 via the communication interface 3 and the communication line 4. This load command is executed by the load command 211 of the program 21 of the measurement computer. Next, operation mode setting and initialization 212 are performed from the measuring computer 1 to the universal counter 9 via the measuring instrument interface 10 and the general-purpose measuring instrument bus 12. Next, the measurement computer 1 outputs a synchronization code 213 to inform the specimen computer 2 of the completion of the operation mode setting and initialization of the universal counter 9 via the communication interface 3 and the communication line 4. The specimen computer 2 that has performed the input 2201 starts executing the first test program 221.

After setting the instruction to be measured 2211, the initial value 10000 is set 2212 to the counter of the computer under test 2. Next, a start command 2213 for the universal counter 9 is issued. That is, an instruction address code that instructs execution start or completion of the instruction under test via the input/output bus 5, and an instruction data code that determines whether the instruction address code is execution start or completion are executed in this order. They are input to the instruction decoder 8 with shifted timing, and an address strobe signal 6 for capturing the instruction address code at the same timing and a data strobe signal 7 for capturing the instruction data code at the same timing are also input to the instruction decoder 8. be done. Further, a clock pulse from the computer under test 2 is applied to the AND circuit 82 of the instruction decoder 8 via the input/output bus 5. The instruction address code is latched into the address decoder 81 by the address strobe signal 6 input at the same timing, and after being decoded, the AND circuit 82 outputs the binary signal level "1".
Output as . The instruction data code is input as level "1" to the NOT circuit 83 and the J input terminal of the JK flip-flop circuit 84, and
It is set to level "0" by the NOT circuit 83 and applied to the K input terminal of the flip-flop circuit 84.

The above-mentioned clock pulse is controlled and outputted so that it always takes the level "1" when the universal counter is operating, and is outputted by the AND circuit 8.
The output of the address decoder 81 and the command data strobe signal, which are the inputs of 2, are at level "1".
At the same time, the clock pulse and the clock pulse are input to the AND circuit, and when the AND condition is satisfied, a clock pulse of level "1" is input to the synchronous clock input terminal C of the flip-flop circuit 84 as an output.

Therefore, after starting the universal counter 9 by generating a gate signal 11 of level "1" to the Q output terminal of the flip-flop circuit 84 and starting the universal counter 9, the instruction to be measured is executed 2214, and then the test object is Execution 2215 is repeated 10,000 times while incrementing the computer counter, and when the number of repeated executions reaches 10,000, a universal counter stop command 2216 is executed. That is, the negative circuit 8
3 and the signal input to the J input terminal of the flip-flop circuit 84 becomes level "0", and the gate signal 1 of the Q output terminal of the flip-flop circuit 84 becomes "0".
1 becomes level "0" and the measurement of its execution time is completed. Next, a measurement completion synchronization code is output 2202 to the measurement computer 1 via the communication interface 3 and the communication line 4. The measurement computer 1 inputs this measurement completion synchronization code 214
When this is done, a request command 215 for transferring instruction execution time data is sent to the universal counter 9.
and read the execution time transferred 216
, and the execution time T _A of the first test program is
get. In this way, when the execution of the first test program including the instruction under test is completed, execution of the second test program 222 is subsequently started. This program 222 is obtained by removing the instruction set 2211 and measured instruction execution 2214 from the first test program 221, and can be executed in the same manner as the first test program. , the program execution time T _B is obtained.

When the execution times T _A and T _B of the first and second test programs are obtained, the measurement computer 1 calculates the execution time of the instruction under test 2.
17, and the execution time T _X of one instruction to be measured is output by calculating the following equation (1).

T _X =(T _A - T _B )/10000 (1) Next, this calculation result is outputted 218 to the line printer 13.

As explained above, the present invention includes a first test program including the instruction under test, and a second test program excluding the setting and execution of the instruction under test from the first test program. is executed by the test computer by the measurement computer, and the execution time of the instruction to be measured can be automatically measured with high precision and high speed based on the difference in execution time and the number of repeated executions.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a flowchart showing programs for the measurement computer and specimen computer used in the embodiment shown in FIG. 1...Measurement computer, 2...Specimen computer, 3...Communication interface, 4...
...Communication line, 5...I/O bus, 6...Address strobe signal, 7...Data strobe signal,
8...Instruction decoder, 9...Universal counter, 10...Measuring instrument interface, 11...Universal counter gate signal, 12...Measuring instrument bus, 13...Line printer, 81...Address decoder, 82... AND circuit, 83...NOT circuit, 84...Flip-flop circuit, 21...
Measurement computer program, 22... Specimen computer program, 221... First test program, 222... Second test program.

Claims (1)

[Claims] 1. A measurement computer loaded with a measurement program that loads and executes a test program on a specimen whose execution time of an instruction to be measured is measured, and a universal counter that measures the execution time of the test program; An address that receives, decodes and latches an address strobe signal that outputs an instruction address code output from the test sample computer at almost the same timing as the test program, and outputs one of the binary levels. A decoder, and the output of the address decoder are input, and the instruction data code outputted from the specimen computer with a delay from the timing of the address code, the data strobe signal outputted at almost the same timing as this, and the clock signal are inputted. a binary gate signal that starts the universal counter when the instruction data code reaches one of the binary levels and stops the universal counter when the instruction data code reaches the other binary level; an instruction decoder having a logic circuit for output; a peripheral device for outputting the execution time of the instruction to be measured calculated by the measurement computer from the execution time measured by the universal counter; the measurement computer and the specimen. The test program includes a communication interface for interfacing between computers, and a measuring instrument interface for interfacing between the measurement computer and the universal counter, and the test program sends instructions to be measured to the specimen computer. set,
An initial value is set in the counter of the test object computer, the universal counter is commanded to start, the instruction to be measured is repeatedly executed, the counter of the test object computer is incremented according to the number of executions, and the counter of the test object computer is incremented according to the number of executions. a first test program configured to instruct the universal counter to stop when the number of repetitions has been reached; a first test program configured to set an initial value in a counter of the test specimen computer; instruct the universal counter to start; a second test program configured to increment a counter of the test object computer by the number of repetitions and instruct the universal counter to stop; and an execution time of the first and second test programs. A computer instruction execution time measuring device, characterized in that the measuring computer calculates the difference of the number of repetitions by dividing the difference by an amount directly proportional to the number of repetitions, thereby measuring the instruction execution time per arbitrary number of executions.