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Date: Thu, 30 Dec 2010 00:00:10 +0100
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Subject: Re: Task execution time test
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Date: 2010-12-29T23:59:59+01:00
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Le 26/12/2010 11:25, Dmitry A. Kazakov a �crit :
> Here is a small test for task execution time.
>
> Five worker tasks are used to generate background CPU load. When the
> measured task enters delay 0.1ms (on a system where delay is non-busy) it
> should lose the CPU prematurely.
>
> Under at least some Windows systems the test might fail because Windows
> performance counters are CPU quants 1ms or 10ms, depending on settings.
>

> On my Windows XP SP3 the test yields 0-0.
>

Here are the measures of the code on my Windows machines
which tend to prove that the scheduling is correct.

On Windows Vista SP2 :
For 1_000 loops
Seconds 0 Fraction 0.093600600
For 10_000 loops
Seconds 1 Fraction 0.029606600

On Windows XP2002 SP3 :
For 1_000 loops
Seconds 0 Fraction 0.125000000
Seconds 0 Fraction 0.109375000
For 10_000 loops
Seconds 1 Fraction 0.140625000

GPS 4.4.1 (20091215) hosted on i686-pc-mingw32
GNAT GPL 2010 (20100603)

I am just curious to know how to get/set Windows performance counters
-----------------------------------------------
Regards
Fran�ois FABIEN