[MATLAB PCT] Unable to use all of the available cores with parfor.

Hi, I am running a simple parfor tester on a small cluster that has 36 cores. The codes are shown below. Oddly, among the 36 cores that are available, I can only use up to 10 cores.

nWorker = 11;  
myPool = parpool('customLocal', nWorker);
  y = zeros(1000,1); 
  parfor n = 1 : 1000
      y(n) = max(svd(randn(n))); 
  end
  delete(myPool);

The error message looks counter-intuitive.

Error using parpool (line 111)
Failed to start a parallel pool. (For information in addition to
the causing error, validate the profile 'customLocal' in the
Cluster Profile Manager.)

Error in parfor_tester_SCRIPT (line 10)
myPool = parpool('customLocal', 11);

Caused by:
    Error using parallel.internal.pool.InteractiveClient/start
    (line 358)
    Failed to initialize the interactive session.
        Error using
        parallel.internal.pool.InteractiveClient>iThrowIfBadParallelJobStatus
        (line 729)
        The interactive communicating job failed with no message.

It appears to be a problem with the validation step. When I tried to validate the profile, it aborts at spmd every time. I have attached a screenshot and the error message here.

What might have caused this validation problem? How can I fix it? The version of MATLAB I am using is R2014b. Thanks ahead of time!

[Edric Ellis]

It looks like there are installation problems - from the validationDetails.txt, it seems that the workers cannot correctly access the java code required to operate. I suggest contacting MathWorks support directly about this.

[Shan Dou]

Thanks! :) Just sent a service request for troubleshooting.