linux 测试程序运行时间

time ./your_program

#include <stdio.h>
#include <time.h>

int main() {
    struct timespec start, end;
    clock_gettime(CLOCK_MONOTONIC, &start);

    // 这里放置你的程序代码
    for (int i = 0; i < 1000000; i++) {
        // 模拟工作负载
    }

    clock_gettime(CLOCK_MONOTONIC, &end);

    long seconds = end.tv_sec - start.tv_sec;
    long nanoseconds = end.tv_nsec - start.tv_nsec;
    double elapsed = seconds + nanoseconds * 1e-9;

    printf("Elapsed time: %.2f seconds\n", elapsed);
    return 0;
}

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

int main() {
    struct timeval start, end;
    gettimeofday(&start, NULL);

    // 这里放置你的程序代码
    for (int i = 0; i < 1000000; i++) {
        // 模拟工作负载
    }

    gettimeofday(&end, NULL);

    long seconds = end.tv_sec - start.tv_sec;
    long microseconds = end.tv_usec - start.tv_usec;
    double elapsed = seconds + microseconds * 1e-6;

    printf("Elapsed time: %.2f seconds\n", elapsed);
    return 0;
}