Roscoe Bartlett wrote:
> ... an accurate timing function to be used
> with Linux/GNU g++ 2.95.2? The standard library function clock() only
> appears to have a minimum resolution of 0.01 sec. I need something much
> more accurate.
There was (is?) a series of articles about C performance in the C/C++ Users
Journal
by Koenig and Moo. One of the articles, in the February 2000 issue (+/- 2
months),
treated your question. The solution they used was to calibrate their own
delay
loop by watching exactly /when/ the value returned by clock() changes.
They were
able to increase accuracy by orders of magnitude this way.
However, as far as I recall, it didn't work on all platforms.
And it appears "from behind through the chest in the eye", as we say here.
Personally, I use the real time clock, use more iterations
and accept the inaccuracies.
Rainer
_________________________________________________________________________
Rainer Blome rainer_blome@de.ibm.com
Infrastructure & Systems Management IBM Deutschland
Informationssysteme GmbH
Tel.: 069-6645-1223 Adr.: Lyoner Str.13, 60582 Frankfurt/Main
Mobil: 0170-794 1303 Post: PF 710453, 60494
Frankfurt/Main
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