sharing matrix in parfor
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I have a program which uses the parfor loop and contains a large matrix (2-3GB). Each worker continuously access random locations in the matrix, but never write to the matrix. When using parfor the matrix is copied for each worker causing a massive memory spike. Is there a way to prevent this and allow each worker to read from the same matrix?
Sarah Wait Zaranek on 14 Sep 2012
There is no way to do shared memory automatically in a parfor loop. However, depending on where the data is located - there may be options. For instance, if the data is coming from a file - memory mapping may work well. Look at the function memmapfile.