Matlab Parfor with shared array?

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.

Answer 1

[Jason Ross]

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

[Justin]

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]

Ok, I read the link you sent and realize i need more work in the body. Thanks,

-Justin

[Jason Ross]

No problem!