Realloc copy operations

a.c

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

const size_t MAX_SIZE = 1024*1024*1024; /* 1 GiB */

int main(){
	void* ptr=NULL;
        void* decoy=NULL;
	void* last;
	int n=0;
	int i;
        size_t size = 1024;
	for (i=1; size < MAX_SIZE; i++){
		last = ptr;
                decoy = realloc(decoy, size);
		ptr = realloc(ptr, size);
                size = size * 2;
		if(last!=ptr) n++;
	}
	printf("Total op = %d\nNumber of copy operations = %d\n", i, n);
	return(0);
}

gistfile1.txt

Total op = 21
Number of copy operations = 15