map-reduce/testcode.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>

int main() {
    char cmd[100];
    fgets(cmd, 100, stdin); // get command

    struct timeval start, end;
    long long total_time = 0, cnt = 100; // run 100 times
    for (int i = 1; i <= cnt; i++) {
        gettimeofday(&start, NULL);
        system(cmd); // run command
        gettimeofday(&end, NULL);
        total_time += (end.tv_sec - start.tv_sec) * 1000000 + (end.tv_usec - start.tv_usec); // calculate total time
        printf("%d-th time is %f s\n", i, (end.tv_sec - start.tv_sec) + (end.tv_usec - start.tv_usec) / 1000000.);
    }
    printf("average time is %f s\n", total_time / 1000000. / cnt);
    return 0;
}