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

int main() {
    struct timespec t1, t2;
    void* buf = malloc(2 * 1024 * 1024);
    
    clock_gettime(CLOCK_MONOTONIC, &t1);
    memset(buf, 0xEF, 2 * 1024 * 1024);
    clock_gettime(CLOCK_MONOTONIC, &t2);
    
    double ms = (t2.tv_sec - t1.tv_sec) * 1000.0 + (t2.tv_nsec - t1.tv_nsec) / 1000000.0;
    
    printf("memset time: %.3f ms\n", ms);
    printf("First byte: 0x%02x (should be 0xEF)\n", ((unsigned char*)buf)[0]);
    
    free(buf);
    return 0;
}