quick tutorial on matlab parfor

Step 0:  Please make sure you

Step 1: prepare the parallel environment(suppose you have 8 cores)

matlabpool(8)

Step 2: Just replace all the parallelable "for" keyword into "parfor"
Make sure the jobs are independent each other, for example:



Ste 3: Run you script


tic

parfor i = 1:8
            c(:,i) = eig(rand(1000));
end
toc



tic

for i = 1:8
            c(:,i) = eig(rand(1000));
end


toc


%% Results:

Elapsed time is 3.718411 seconds.
Elapsed time is 5.671640 seconds


Conclusion:

The second group scripts are significantly slower than 1st group.



Reference:
http://www.mathworks.com/help/distcomp/getting-started-with-parfor.html#brb2x57