Microseconds in Per

longliveAJ has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: Microseconds in Per by Tanalis (Curate) on Jun 14, 2005 at 14:33 UTC
Take a look at the Time::HiRes module. -- Foxcub `#include www.liquidfusion.org.uk`	[reply]
Re^2: Microseconds in Per by spurperl (Priest) on Jun 14, 2005 at 17:13 UTC
Unfortunately, HiRes doesn't work well on Windows machines, where it doesn't provide granularity better than ~ 30 ms. In fact, I've been continuously dissapointed trying to find good solutions for high resolution timers on Windows. Even calls to native Win32 didn't help - the 30 ms seems to be a magic barrier.	[reply]
Re^3: Microseconds in Per by Tanalis (Curate) on Jun 15, 2005 at 06:59 UTC
Interesting. I've done some quick research into this, and it turns out that while it's possible to obtain a timestamp in Windows to 100-nanosecond accuracy, the value returned is only updated once each timer tick[1], or about once every 16 milliseconds. It'd seem that that update mechanism is the "magic barrier" you see. Cambridge University offer a solution to this, written in C++ - but whether that'd help you any I don't know :) -- Foxcub `#include www.liquidfusion.org.uk` 1. http://www.cl.cam.ac.uk/users/kw217/useful/win32time.html	[reply]
Re^4: Microseconds in Per by BrowserUk (Patriarch) on Jun 15, 2005 at 17:32 UTC
Re^4: Microseconds in Per by spurperl (Priest) on Jun 15, 2005 at 10:28 UTC
Re: Microseconds in Per by cog (Parson) on Jun 14, 2005 at 14:34 UTC
Check out Time::HiRes.	[reply]
Re: Microseconds in Per by longliveAJ (Acolyte) on Jun 14, 2005 at 18:05 UTC
Thanks guys ...looking into it	[reply]