Mega Code Archive
Time c code
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
/* array size */
#define MAXARRAY 999999
#define CPU_TIME (getrusage(RUSAGE_SELF,&ruse), ruse.ru_utime.tv_sec + \
ruse.ru_stime.tv_sec + 1e-6 * \
(ruse.ru_utime.tv_usec + ruse.ru_stime.tv_usec))
/* get resource limits and usage */
extern int getrusage();
struct rusage ruse;
/* compare function for qsort() */
int cmp(const void *a, const void *b) {
const int *x = (const int *)a;
const int *y = (const int *)b;
return(*x > *y) - (*x < *y);
}
int main(void) {
int array[MAXARRAY] = {0};
double first, second;
time_t start, end;
int i = 0;
/* start */
time(&start);
first = CPU_TIME;
/* produce some cpu cycles... */
/* load some random values */
for(i = 0; i < MAXARRAY; i++)
array[i] = rand() % 100;
/* qsort the array */
qsort(array, MAXARRAY, sizeof(int), cmp);
/* end */
second = CPU_TIME;
time(&end);
printf("cpu : %.2f secs\n", second - first);
printf("user : %d secs\n", (int)(end - start));
}
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