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Forum Topic - The issue about clock() function???:

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Jerry Van

01/12/2011 9:13 PM

post82069

The issue about clock() function???

Hi, guys

I used the clock() to measure the time of my function would take. The time_used was about 1s, but the actual wallclock 
time is about 20s in the real world. Is there some issue about clock function or a wrong CLOCKS_PER_SEC defined in <time
.h>?

My code is as follows:

    start_time = clock();
          DoSomething();
     stop_time = clock();

    float time_used = 0.0f;
    time_used = (float)((float)(stop_time - start_time)/(float)CLOCKS_PER_SEC);

BR
Jerry

Mario Charest

01/12/2011 10:49 PM

post82074

RE: The issue about clock() function???

Read clock() documentation, clock() measure actual CPU time and NOT human time.

-----Message d'origine-----
De : Jerry Van [mailto:community-noreply@qnx.com] 
Envoyé : 12 janvier 2011 21:14
À : general-community
Objet : The issue about clock() function???

Hi, guys

I used the clock() to measure the time of my function would take. The time_used was about 1s, but the actual wallclock 
time is about 20s in the real world. Is there some issue about clock function or a wrong CLOCKS_PER_SEC defined in <time
.h>?

My code is as follows:

    start_time = clock();
          DoSomething();
     stop_time = clock();

    float time_used = 0.0f;
    time_used = (float)((float)(stop_time - start_time)/(float)CLOCKS_PER_SEC);

BR
Jerry



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