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

/*
   memory = 128GB
   vmbug 60  # means 60GB RAM
   vmubc -tty -interval 5 -memory -pagefault -swap
   top -b -U$USER -s5 -d1000 -I -u
 
 */

int main(int argn, char *argv[]){
  int i,j,k,mem=60;  char **buf;
  if (argn!=2) printf(" usage: vmbug memory[GB]\n ");
  mem =atoi(argv[1]);
  setvbuf(stdout,NULL,_IONBF,0);
  system("vmubc -tty -memory -pagefault -swap -interval 10 &");
  printf(" mem/GB=%d\n",mem);
  buf=malloc(mem*sizeof(char *));  assert(buf);
  for (i=0;i<mem;i++) {
    buf[i]=(char *)malloc(1024*1024*1024); /* alloc 1GB chunks */
    assert(buf[i]); printf(" get memory %3dGB\n",i);
  }  for(k=0;;k++) {
   for (i=0;i<mem;i++) {
    printf(" cycle %3d %3dGB\n",k,i);
    for (j=0;j<1024*1024*1024;j++) buf[i][j]=((j+(j>>16))&127);
   }
  }
}