massif demo

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

/*

Demo program:
 gcc -o memfun memfun.c  -lm
 valgrind --tool=massif --massif-out-file=massif.out ./memfun
 massif-visualizer massif.out
 (or ms_print massif.out > massif.txt; less massif.txt)
*/


int main(void)
{
  int ii,jj;
  int *pt;
  int *pt2;
  float ac;
  int numberOfPeaks = 0;

  for (ii=0;ii<100;ii++) {
    /* Allocate some small linearly increasing memory block */
    pt = (int *)malloc((1000*ii+1)*sizeof(int));
    if (ii%5 == 0) {
      /* Allocate some gigantic memory block - but only every 10th iteration */
      pt2 = (int *)malloc((1000000)*sizeof(int));
      printf("Allocating large memory block\n");
      numberOfPeaks++;
    } else {
      /* Allocate just one element for every 9/10 iteration */
      pt2 = (int *)malloc((1)*sizeof(int));
    }
    /* Put in data and print it */
    pt2[0] = ii;
    printf("   Found value %i\n",pt2[0]);
    /* Free the memory - note that the peak */
    free(pt2);

    /* Spend time on "something" - the actual work does not matter*/
    ac = 1;
    for (jj=0;jj<10000*(1 + ii);jj++) {
      ac += sin(jj*0.01) + cos(jj*0.01 + 0.3);
    }
    printf("   Found dummy value %f\n",ac);
    /* Free the memory */
    free(pt);
  }
  printf("I made %i memory peaks\n",numberOfPeaks);
  return 0;
}