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Topic: performance of parfor
Replies: 4   Last Post: Apr 8, 2013 3:28 AM

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kinor

Posts: 181
Registered: 11/19/09
performance of parfor
Posted: Apr 4, 2013 1:13 PM
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Hello,

I used parfor a while ago and it worked quite well (2.5 time faster with 3 labs).
Now I tried to use it on win 7 with 2012a and an example from http://blogs.mathworks.com/loren/2007/10/03/parfor-the-course/ with the following results:

matlabpool local 3

n = 600;
tic
ranks = zeros(1,n);
parfor (ind = 1:n)
ranks(ind) = rank(magic(ind)); % last index could be ind,not n-ind+1
end
toc

tic
ranks = zeros(1,n);
for (ind = 1:n)
ranks(ind) = rank(magic(ind)); % last index could be ind,not n-ind+1
end
toc

Starting matlabpool using the 'local' profile ... connected to 3 labs.
Elapsed time is 10.773548 seconds.
Elapsed time is 13.993966 seconds.

Which is surprisingly slow for 3 labs. I would be really grateful for any hint to get the 3 labs working.

Best
kinor



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