linux下C语言函数执行时间统计

starwing@starwing-desktop:~/Work/prj$ cat test.c
#include 
#include 

int func(int i)
{
    return i <= 2 ? 1 : func(i - 1) + func(i - 2);
}

int main(void)
{

    printf("zzz: %d\n", func(20));
    return 0;
}
/* cc: cmd='' */
starwing@starwing-desktop:~/Work/prj$ gcc -o test -pg test.c
starwing@starwing-desktop:~/Work/prj$ ./test
zzz: 6765
starwing@starwing-desktop:~/Work/prj$ gprof ./test ./gmon.out

/**
*      file_name:      time_lost.c
*    description:
*
*        version:      1.0
*        created:      3:32 2009-7-21
*       revision:      none
*       compiler:      gcc 4.3.3
*
*         author:      prankmoon@gmail.com
*        company:
*/

#include 
#include 

/* just for test */
int foo(int n)
{
    int i;
    int sum = 0;
    for (i=0; i