How to measure execution time in c on linux?
How to measure execution time in c on linux?
1 answer
by
viola_gleichner ,
a month ago
@kaley
There are several ways to measure execution time in C on Linux. Here are a few methods:
- time.h library: You can use the functions provided in the time.h library, such as clock(), clock_gettime(), or gettimeofday().
Here's an example using clock():
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#include <stdio.h>
#include <time.h>
int main() {
clock_t start, end;
double cpu_time_used;
start = clock();
// Write your code or function to be measured here
end = clock();
cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;
printf("Execution time: %f seconds
", cpu_time_used);
return 0;
}
|
- The time command: You can compile and run your C program using the time command in the Linux terminal. It will provide you with detailed information about the execution time. For example:
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$ gcc -o program program.c $ time ./program |
It will display real, user, and system time for your program's execution.
- Using clock_gettime() with the CLOCK_MONOTONIC clock: This method provides high-resolution timing and is suitable for measuring shorter durations. Here's an example:
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#include <stdio.h>
#include <time.h>
int main() {
struct timespec start, end;
double cpu_time_used;
clock_gettime(CLOCK_MONOTONIC, &start);
// Write your code or function to be measured here
clock_gettime(CLOCK_MONOTONIC, &end);
cpu_time_used = (end.tv_sec - start.tv_sec) +
(end.tv_nsec - start.tv_nsec) / 1e9;
printf("Execution time: %f seconds
", cpu_time_used);
return 0;
}
|
These are just a few ways to measure execution time in C on Linux. Choose the method that suits your needs and the level of precision you require.