Try to allocate the max amount of dynamic memory to probe OS behaviour. Mostly for 32bit systems.

malluco.c

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

#ifdef __MINGW32__
#define printf __mingw_printf
#endif

int main() {

    size_t base_size = 0;
    size_t limit = 0;

    int progress = 1;
    while (progress) {
        progress = 0;
        size_t size = 32 * 1024 * 1024; //10MB
        void* ptr;
        while ((ptr = malloc(base_size + size)) != NULL) {
            progress = 1;
            limit = base_size + size;
            printf("Allocated %zu bytes of memory\n", limit);
            size *= 2;
            free(ptr);
        }
        base_size = limit;
        printf("Unable to allocate %zu bytes of memory\n", base_size);
    }

    printf("MAX allocated memory: %zu MB \n", limit / (1024 * 1024));


    return 0;
}

Compiled with:

Linux 64

gcc -o malluco --std=c99 --pedantic malluco.c

Linux 32

gcc -o malluco32 -m32 --std=c99 --pedantic malluco.c

Windows 64 (MingW)

x86_64-w64-mingw32-gcc -o malluco.exe -Wall -pedantic -std=c99 malluco.c

Windows 32 (MingW)

i686-w64-mingw32-gcc -o malluco32.exe -Wall -pedantic -std=c99 malluco.c