Matlab Parfor with shared array?

2012 3 22
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Is there anyway to share an array between workers like below:
A = zeros(10,10)
parfor i = 1:10
for j = 1:10
A(i,j) = i*j;
end
end
I was able to run this but its slower than a regular for-loop.

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Jason Ross
Jason Ross 2012-3-22

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You aren't doing enough work to make the overhead of starting the workers worth it.
http://www.mathworks.com/matlabcentral/answers/32460-parfor-slower-than-for-for-simple-tutorial-example

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Justin
Justin 2012-3-22
Jason,
Yea, the 10 was just as an example. I scaled it up to like 5000 and its still slower. Both give the same results. In addition, the parfor does work 6 threads from the system monitor as well. For a matrix size of 5000x5000 it takes about 4-5 seconds with parfor and 0.3 seconds with a regular forloop
Justin
Justin 2012-3-22
Ok, I read the link you sent and realize i need more work in the body. Thanks,
-Justin

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