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Re: Object graphics under Linux: are they supposed to be that slow? [message #29076 is a reply to message #29066]

Thu, 31 January 2002 18:16

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

In the posting that started this thread, I said that IDL was *much*
slower (~ a factor of 10) in an object-graphics animation application
under Linux than under Windows. The various benchmarks presented since
then suggest that IDL for Linux *is* slower at object graphics on this
machine, but not by a factor of 10. So the original result was a
mystery.

Well I've solved it. It was caused by setting the window's RETAIN
property to 2 (system provides backing store). Here are some numbers
(where "-" means this property doesn't affect performance):

OS RENDERER RETAIN Time per frame

Windows 0 - 0.035 s
Windows 1 - 0.043 s

Linux - 1 0.052 s
Linux - 2 0.330 s

BTW the animation is part of my "Motley" library at

http://katipo.niwa.cri.nz/~hadfield/gust/software/idl/

The animation itself is in mgh_example_animate.pro, or you can get
almost the same thing with the command

mgh_new, 'mgh_surface_movie', /EXAMPLE

Anyone wants to try it out is welcome. But I'd be the first to admit
this library is a bit...shall we say...bloatish. (Though not as bad as
Microsoft Office or KDE.) I'd certainly be interested in any bug
reports.

---
Mark Hadfield
m.hadfield@niwa.co.nz http://katipo.niwa.co.nz/~hadfield
National Institute for Water and Atmospheric Research

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[Message index]

		Object graphics under Linux: are they supposed to be that slow? By: Mark Hadfield on Sun, 27 January 2002 15:23
		Re: Object graphics under Linux: are they supposed to be that slow? By: Mark Hadfield on Thu, 31 January 2002 18:16
		Re: Object graphics under Linux: are they supposed to be that slow? By: Rick Towler on Thu, 31 January 2002 09:55

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