linux小代码段时间测量md

示例程序如下：

#include <stdio.h>#include <stdlib.h>#include <time.h>int main(void){    int result = 0, i;    struct timespec tt1, tt2;        clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &tt1);    for (i=0; i<10; i++) {        result += random();    }    clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &tt2);        printf("used %ld nanoseconds!\n", tt2.tv_nsec - tt1.tv_nsec);}

编译运行如下：

$ gcc demo_clocktime.c -o demo_clocktime$ ./demo_clocktimeused 1298 nanoseconds!

如上，此类入侵式的性能测量个别用于晚期开发。

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