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Maximum number of workers in a parallel loop (local cluster) with Matlab R2014a?

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MRC
MRC on 26 Aug 2014
Commented: Greg on 17 Oct 2014
I have a Macbook Pro Intel Core I7; which is the maximum number of workers in a parallel loop (local cluster) with Matlab R2014a? These are the characteristics of my laptop
hw.physicalcpu: 4
hw.logicalcpu: 8

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Accepted Answer

Friedrich
Friedrich on 26 Aug 2014
Hi,
the rule of thumb is to use one worker per pyhsical core. This is also stated here.

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Friedrich
Friedrich on 26 Aug 2014
You can use more, but if you do its likely that it does not speed things up anymore because your system does not have any futher computational ressources.
Simply try it out. Run with 4 workers and do the same with 8 and see what happens.
Greg
Greg on 17 Oct 2014
Just wanted to add my modest experimental result
sz = 450;
A = rand(sz,sz,'single');
B = rand(sz,sz,'single');
tic;
parfor k = 1:sz^2
fft2(A.*B);
end
toc;
6 workers - 159 sec.
12 workers - 118 sec.

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