Question

How to get the CPU time used by the process since the beginning of an implementation in C

Answer 1

#include <stdio.h>
#include <threads.h> 
 
int time_consuming(void* thr_data) {
    double d = 0;
    
    for (int i = 0; i < 10000; i++) {
       for (int j = 0; j < 10000; j++) {
           d += d * i * j;
       }
    }   
    
    return 0;
}
 
int main(void)
{
    clock_t t1 = clock();
 
    thrd_t thr; 
    thrd_create(&thr, time_consuming, NULL); 
    thrd_join(thr, NULL); 

    clock_t t2 = clock();
 
    double CPUtime = 1000.0 * (t2 - t1) / CLOCKS_PER_SEC;

    printf("CPU time used per clock(): %.2f ms\n", CPUtime);
}

  
  
/*
run:
  
CPU time used per clock(): 513.24 ms

*/

 

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