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Message-ID: <20041020134448.68649.qmail@web54308.mail.yahoo.com>
Date: Wed, 20 Oct 2004 14:44:48 +0100 (BST)
From: Lionel B <lionelbuk AT yahoo DOT co DOT uk>
Reply-To: cygwin AT cygwin DOT com
Subject: Re: High resolution process timing
To: cygwin AT cygwin DOT com
In-Reply-To: <fdb072ec041020060166ef9955@mail.gmail.com>
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 --- Robert Pendell wrote: 

[top-post rearranged]

> On Wed, 20 Oct 2004 12:12:37 +0100 (BST), Lionel B
> Lionel B wrote:
> > Greetings,
> > 
> > Is it possible in Cygwin (W2k, Pentium 4, gcc 3.3.3) to access a higher
> > resolution (or perhaps I mean "granularity") process CPU timer than the
> libc
> > clock() call? I am finding clock() inadequate for some code benchmarking.
> > 
> > [It is not clear to me whether this is indeed a Cygwin issue, or rather a
> > Windows issue and therefore OT here - apologies if so].
> > 
> > Having browsed the archives, it seems that it may well be possible to
> access
> > high-resolution *system* timers (perhaps using NT API calls to
> > QueryPerformanceCounter() & family), but I can see no way to achieve
> > per-process timing this way.
> > 
> > Any pointers appreciated,

> Search google for "windows high resolution timer" (no quotes) and that
> will probably give some answers.

Been there, done that. Windows high-res timers seem to boil down to
QueryPerformanceCounter(), QueryPerformanceFrequency(), which measure time used
by *all* (including system) processes. This is no good to me.

-- 
Lionel B
 


	
	
		
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