Java Exception when running Parfor
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Hi
I am trying to run a parallel job in Matlab using parfor on a machine with 12 nodes and 128 GB of memory, so resources should not be a problem. My program uses two very large matrices (communication of which may be the source of the problem). I get following error at the start of parfor loop:
Error using parallel_function (line 598) Java exception occurred: java.lang.IllegalArgumentException at java.util.concurrent.Semaphore.acquireUninterruptibly(Unknown Source) at com.mathworks.toolbox.distcomp.pmode.io.TransmissionChannel$MessageHolder.acquireNecessaryPermits(TransmissionChannel.java:611) at com.mathworks.toolbox.distcomp.pmode.io.TransmissionChannel.enqueueMessageForSending(TransmissionChannel.java:118) at com.mathworks.toolbox.distcomp.pmode.io.TransmissionChannel.enqueueMessageForSending(TransmissionChannel.java:511) at com.mathworks.toolbox.distcomp.pmode.io.CommunicationGroup.sendToChannel(CommunicationGroup.java:289) at com.mathworks.toolbox.distcomp.pmode.io.CommunicationGroup.sendTo(CommunicationGroup.java:253) at com.mathworks.toolbox.distcomp.pmode.ParforControllerImpl.sendInterval(ParforControllerImpl.java:343) at com.mathworks.toolbox.distcomp.pmode.ParforControllerImpl.addInterval(ParforControllerImpl.java:289) at com.mathworks.toolbox.distcomp.pmode.ParforControllerImpl.addInterval(ParforControllerImpl.java:244)
Following is a demo code to give you an idea. Any help would be greatly appreciated.
Best,
Vikrant.
code:
function obj = getobj(P, X, Wi)
% P = 117 x 39 matrix
% X = large matrix
% Wi = Large sparse matrix
[I, J, V] = find(Wi);
obj = 0;
parfor k = size(I,1);
i = I(k);
j = J(k);
if i ~= j
Xi = X(i,:);
Xj = X(j,:);
fi = sqrt(Xi*(P*P')*Xi');
fj = sqrt(Xj*(P*P')*Xj');
fij = Xi*(P*P')*Xj';
obj = obj + (1 - fij/(fi*fj))*(-V(k));
end
end % END OF PARFOR
end % END OF FUNCTION
PS: There is a reason I have to write the code in the crude way. For example, my matrix X is 1471326x117, that is too big to get Y = X*X';
1 个评论
Martin
2012-3-9
Hi Vikrant. I'm getting the same error for some of my code. Did you manage to figure this out?
Thanks,
Martin
回答（1 个）
John
2012-5-14
0 个投票
Hello Martin/Vikrant, Did you ever find a solution to this? Getting error on 2011b. Don't get the error when small arrays involved, only with large arrays being communicated.
1 个评论
Walter Roberson
2012-5-14
Arrays to be communicated are limited to 2 gigabytes.
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2012-1-20
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