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Re: Fast matrix filling in IDL [message #13836 is a reply to message #13792]

Thu, 17 December 1998 00:00

David Ritscher
Messages: 30
Registered: August 1995

Member

> Hopefully everyone is running this a few times and noting when
> the times have become "stable". Here are three sequential runs
> on a Sun Sparc 2 (IDL 5.1):
>
> IDL> test
> Time for Loop: 2.7740721
> Time for Matrix Operations: 5.2337180 ; OUT OF WHACK!
> Time for Rebin Operations: 0.16969705
> IDL> test
> Time for Loop: 2.6756930
> Time for Matrix Operations: 0.27333605
> Time for Rebin Operations: 0.16920698
> IDL> test
> Time for Loop: 2.7509290
> Time for Matrix Operations: 0.27153599
> Time for Rebin Operations: 0.16843796

Perhaps the first one is not out of whack, but rather, the accurate
time.
When the test is being performed a second time, the operating system has
information that is cached, thus avoiding doing part of the work
associated with the task. Particularly in big tests, I often notice
speed-ups each time, for the first few times I test something. I like
to test by completely exiting my environment, doing other things, and
coming back and repeating the test. If I'm feeling hard-core about it,
I do a reboot in between.

David Ritscher

--
Cardiac Rhythm Management Laboratory
Department of Medicine
University of Alabama at Birmingham
B168 Volker Hall - 1670 University Boulevard
Birmingham AL 35294-0019
Tel: (205) 975-2122 Fax: (205) 975-4720
Email: david.ritscher@bigfoot.com

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[Message index]

		Fast matrix filling in IDL By: weitkamp on Fri, 11 December 1998 00:00
		Re: Fast matrix filling in IDL By: David Ritscher on Thu, 17 December 1998 00:00
		Re: Fast matrix filling in IDL By: J.D. Smith on Wed, 16 December 1998 00:00
		Re: Fast matrix filling in IDL By: Vapuser on Tue, 15 December 1998 00:00
		Re: Fast matrix filling in IDL By: David Foster on Mon, 14 December 1998 00:00
		Re: Fast matrix filling in IDL By: weitkamp on Wed, 06 January 1999 00:00
		Re: Fast matrix filling in IDL By: Martin Schultz on Thu, 17 December 1998 00:00

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