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c++ clock() function problem in windows

Posted on 2009-04-01
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1,414 Views
Last Modified: 2013-12-14
I want to use clock() to get time.
But the code below

while (1)
printf("clock: %d\n", clock());

get the results like:

100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
I think it should get sth like 8,9,10,11...or 8,8,8,9,9,9,10,10....
while (1)
printf("clock: %d\n", clock());

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Question by:rxzang
2 Comments
 
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rendaduiyan earned 250 total points
ID: 24046635
clock is not so accurate. please refer to http://technology.chtsai.org/w98timer/.
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Assisted Solution

by:itsmeandnobodyelse
itsmeandnobodyelse earned 250 total points
ID: 24049197
rendaduiyan is right. clock only would be actualized any 15/16 milliseconds even on Windows Versions younger than W98.  

You would need to use QueryPerfomanceCounter to get better results. Or for emasuring performance you would need to repeat the measured action - say 1 million of times - to get useable times for comparing.

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