zero.c

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

char bss[512*1024*1024];

void
print_times(char *tag, struct timeval *before, struct timeval *after)
{
	int result = (after->tv_sec - before->tv_sec) * 1000000
		+ ((int)after->tv_usec) - ((int)before->tv_usec);
	printf("%s: %d\n", tag, result);
}

int
main(int argc, char **argv)
{
	struct timeval t1;
	struct timeval t2;
	struct timeval t3;

	if (gettimeofday(&t1, NULL))
		return 1;
	memset(bss, 0, sizeof bss);
	if (gettimeofday(&t2, NULL))
		return 1;
	memset(bss, 0, sizeof bss);
	if (gettimeofday(&t3, NULL))
		return 1;

	print_times("first run", &t1, &t2);
	print_times("second run", &t2, &t3);

	return 0;
}