dev/c/realloc_speed_test/realloc_speed_test_c.c

//~ time ./realloc_speed_test_c 50000 100000
//~ Success, iterations = 50000, nobj = 100000
//~
//~ real	0m0.313s
//~ user	0m0.130s
//~ sys	0m0.160s

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "xalloc.h"

int main(int argc, char *argv[])
{
	if (argc != 3) {
		fputs("Usage: realloc_speed_test_cpp iterations nobj\n", stderr);
		exit(-1);
	}

	size_t iterations = (size_t)atoi(argv[1]);
	size_t nobj = (size_t)atoi(argv[2]);

	void **p = malloc(sizeof(void *) * nobj);
	memset(p, 0, sizeof(void *) * nobj);

	size_t i, idx, sz;
	for (i = 0; i < iterations; i++) {
		idx = (size_t)(rand() % (int)nobj);
		sz = i;
		p[idx] = realloc(p[idx], sz);

		if (sz && !p[idx]) {
			fprintf(stderr, "Alloc error at i = %lu\n", i);
			exit(-1);
		}
	}

	for (i = 0; i < nobj; i++)
		free(p[i]);

	free(p);

	printf("Success, iterations = %lu, nobj = %lu\n", iterations, nobj);

	return EXIT_SUCCESS;
}