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Re: much power to mathematica

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  • Subject: [mg125368] Re: much power to mathematica
  • From: David Bailey <dave at>
  • Date: Sat, 10 Mar 2012 06:14:50 -0500 (EST)
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On 09/03/2012 11:08, djmpark wrote:
> David,
> There is a case where parallel processing will give a gain much greater than
> the number of cores used! This is when breaking a complicated graphic, say a
> contour or density plot, into multiple pieces.
> If you have to use 200 x 200 PlotPoints for a regular plot, then you can
> break it into four 100 x 100 plots for the same resolution. You obtain the
> approximate factor of 4 but also much faster execution because you are using
> only 1/4 the PlotPoints for each plot. There might also be some improvement
> with MaxRecursion, because each plot is simpler.
> I've found that the easiest way to understand and use parallel processing is
> to learn about and use ParallelSubmit and WaitAll.

Wouldn't that imply that the plotting process could be speeded up anyway 
be splitting it up into smaller pieces?

Also, I imagine that the contour plot must deteriorate if constructed in 
this way - contours not joining across the borders, etc. I mean the 
parallel computation isn't computing the same result as the original 
sequential one.

David Bailey

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