amazon linux

[isucon@ip-10-126-163-214 ~]$ uname -a
Linux ip-10-126-163-214 3.14.19-17.43.amzn1.x86_64 #1 SMP Wed Sep 17 22:14:52 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
[isucon@ip-10-126-163-214 ~]$ gcc -O2 -o gt gt.c
[isucon@ip-10-126-163-214 ~]$ time ./gt
called 1000000 times, last value is 1412062819.655371

real    0m0.146s
user    0m0.012s
sys     0m0.132s

gt.c

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

int main(int argc, char **argv)
{
    struct timeval tv;
    int i;

    for (i = 0; i < 1000000; ++i)
        gettimeofday(&tv, NULL);

    printf("called %d times, last value is %d.%d\n", i, (int)tv.tv_sec, (int)tv.tv_usec);
    return 0;
}

Ubuntu raring

methane@raring:~$ uname -a
Linux raring 3.13.0-36-generic #63-Ubuntu SMP Wed Sep 3 21:30:07 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
methane@raring:~$ gcc -O2 -o gt gt.c
methane@raring:~$ time ./gt
called 1000000 times, last value is 1412062858.602343

real	0m2.219s
user	0m2.215s
sys 0m0.005s