gistfile1.txt

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

#include <sys/sysinfo.h>

int main()
{
  struct sysinfo sinfo;

  sysinfo(&sinfo);
  printf("total: %lu (%luMB), free: %lu (%luMB)\n", \
    sinfo.totalram, (sinfo.totalram>>10)>>10, \
    sinfo.freeram, (sinfo.freeram>>10)>>10);

  while(1)
  {
    void * dontcare = malloc((32<<10)<<10); // 32MB
    memset(dontcare, 0x1, (32<<10)<<10);

    sysinfo(&sinfo);
    printf("free: %lu (%luMB)\n", \
      sinfo.freeram, (sinfo.freeram>>10)>>10);
  }

  return 0;
}