mem-bench.c

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

#define ARRAY_SIZE(x) (sizeof (x) / sizeof (x[0]))

int
main (int argc, char *argv[])
{
	static char msrc[8192] __attribute__ ((aligned (32)));
	static char mdst[8192] __attribute__ ((aligned (32)));
	const int offs[] = { 0, 8, 9 };
	unsigned long size, loop;
	int i, j;

	if (argc < 3) {
		fprintf (stderr, "%s SIZE LOOP\n", argv[0]);
		return -1;
	}

	size = atoi (argv[1]);
	loop = atoi (argv[2]);

	for (i = 0; i < ARRAY_SIZE (offs); i++) {
		struct timeval start, stop;
		unsigned long elapsed;
		double speed;

		gettimeofday (&start, NULL);
		for (j = 0; j < loop; j++) {
#if defined(MEMSET)
			memset (&mdst[offs[i]], 0, size);
#elif defined(MEMCPY)
			memcpy (&mdst[offs[i]], msrc, size);
#elif defined(MEMMOVE)
			memmove (&mdst[128 + offs[i]], mdst, size);
#endif
		}
		gettimeofday (&stop, NULL);
		elapsed = (stop.tv_sec - start.tv_sec) * 1000000UL +
				  stop.tv_usec - start.tv_usec;
		speed = (double)(((size * loop) / (1024 * 1024UL))) /
				elapsed * 1000000UL;
		printf("%s size %lu src_off 0 dst_off %d speed %5.3f MB/s\n",
			   argv[0], size, offs[i], speed);
	}

	return 0;
}