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Article #307

Re: Why is GnuPlot for PM slow?

#307
From: Roger Fearick
Date: Sat, 08 Aug 1992 16:07
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In article <gyan.713130305@unixg.ubc.ca> gyan@unixg.ubc.ca (Gyan P. Sinha) writes:

>        I wonder whether other people have also found GnuPlot for PM
>to be much slower than the DOS version. Its a great port, and I can 
>finally throw big data sets at it, but the speed of the thing has me
>puzzled. I notice that that the same 3-d plots in the DOS version seem
>to be at least a couple of time faster. The puzzling thing is that its
>not the display itself that seems to be taking the time, but the 
>underlying calculations themselves, as the cpu load jumps to 100%
>while the drawing window is blank, and then as soon as the plot is
>displayed, the pulse graph goes back to normal.

>        Any comments, speculation would be welcome.

>Gyan P. Sinha

I suspect its the translation in the driver which pipes commands to the 
PM window that does it. The DOS version is writing directly to the hardware.
It would be a lot more efficient with pure binary data piped between the 
driver and the window, but the current scheme is simple and it works.
Maybe when I have some time I'll tune it up a bit ....

Roger.




Roger Fearick                 *  Internet: fearick@physci.uct.ac.za
Dept. of Physics              *
University of Cape Town       *
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Path: arc1-ca.pugleaf.net!sparky!uunet!psgrain!ee.und.ac.za!ucthpx!physci.uct.ac.za!fearick
From: fearick@physci.uct.ac.za (Roger Fearick)
Subject: Re: Why is GnuPlot for PM slow?
Sender: news@ucthpx.uct.ac.za (UCT News Admin.)
Message-ID: <fearick.48.713290068@physci.uct.ac.za>
Date: Sat, 8 Aug 1992 16:07:48 GMT
References: <gyan.713130305@unixg.ubc.ca>
Organization: Physics Department, University of Cape Town
Keywords: GnuPlot, PM
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