memory_consumption.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <malloc.h>

void print_memory_usage()
{
    struct mallinfo info = mallinfo();
    printf("Memory usage: %.2f MB\n", (float)info.uordblks / (1024 * 1024));
}


int main(int argc, char *argv[])
{
    if (argc != 2)
    {
        printf("Usage: %s <memory in MB>\n", argv[0]);
        return 1;
    }
    int memory_in_mb = atoi(argv[1]);
    if (memory_in_mb > 2)
    {
        printf("Tips: %s <Memory must not be larger than 2>\n", argv[0]);
        return 1;
    }
    size_t size = memory_in_mb * 1024 * 1024; // Convert MB to bytesS
    int *block[20];

    printf("malloc:\n");
    for (int i = 0; i < 20; ++i)
    {
        block[i] = malloc(size / 20);
        sleep(0.5); // Adjusted sleep time for better visibility
        print_memory_usage();
    }
    printf("\nfree:\n");
    for (int i = 0; i < 20; ++i)
    {
        free(block[i]);
        sleep(0.2); 
        print_memory_usage();
    }

    return 0;
}