linux c programm time
#include <time.h>
#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))
int main(void) {
time_t start, end;
double first, second;
// Save user and CPU start time
time(&start);
first = CPU_TIME;
// Perform operations
...
// Save end time
time(&end);
second = CPU_TIME;
printf("cpu : %.2f secsn", second - first);
printf("user : %d secsn", (int)(end - start));
}