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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#define NUM_OF_GBYTES 8
/* if verbose is enabled forks are done for printing additional informations */
#define VERBOSE 0
#if VERBOSE
/* forking is not always possible if memory is low */
#define sys(cmd) if(system(cmd) == -1) printf("%s failed\n", cmd);
#else
#define sys(cmd) ;
#endif
#define MEMFREE "free -h"
int main(void)
{
char *p[NUM_OF_GBYTES];
int i;
printf("memory usage:\n");
sys(MEMFREE);
printf("\n\n");
for (i = 0; i < NUM_OF_GBYTES; i++) {
p[i] = malloc(1024 * 1024 * 1024);
printf("allocated 1GB: %p\n", p[i]);
sys(MEMFREE);
}
printf("\n\n");
for (i = 0; i < NUM_OF_GBYTES; i++) {
if (p[i]) {
printf("memsetting 1GB: %p\n", p[i]);
sys("date +%s.%N");
memset(p[i], 1, 1024 * 1024 * 1024);
sys("date +%s.%N");
sys(MEMFREE);
}
}
printf("\n\n");
for (i = 0; i < NUM_OF_GBYTES; i++) {
if (p[i]) {
printf("free 1GB: %p\n", p[i]);
free(p[i]);
sys(MEMFREE);
}
}
return 0;
}
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