cd /tmp
cat > test.c <<"EOF"
#include <stdlib.h>
#include <stdio.h>
int main()
{
    size_t allocated=0;
    while(1)
    {
        const size_t chunkSize=4096;
        char* p=malloc(chunkSize);
        if(!p) return 0;
        *p=1;
        allocated+=chunkSize;
        printf("%zun",allocated);
    }
}
EOF
gcc test.c -o test -m32 && ./test | tail -n1