malloc-test.c

#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

static uint64_t timespec_to_ns(struct timespec *ts)
{
        return ts->tv_sec * 1e9 + ts->tv_nsec;
}

static uint64_t time_diff(struct timespec *start, struct timespec *end)
{
        uint64_t start_ns = timespec_to_ns(start);
        uint64_t end_ns = timespec_to_ns(end);
        assert(start_ns < end_ns);
        return end_ns - start_ns;
}


int main(int argc, char *argv[])
{
        struct timespec start, end;

        if (clock_gettime(CLOCK_MONOTONIC, &start) < 0) {
                assert(0);
        }
        int nr_iter = 10000000;
        for (int i = 0; i < nr_iter; i++) {
                void *p = malloc(64);
                assert(p != NULL);
        }
        if (clock_gettime(CLOCK_MONOTONIC, &end) < 0) {
                assert(0);
        }
        printf("%.2f ns/call\n", (double) time_diff(&start, &end) / (double) nr_iter);
}