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