parpool does not open.

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Arabarra on 24 Feb 2020
Commented: Raymond Norris on 17 Feb 2021
Since a couple of weeks and out of a sudden, I cannot use Parallel Toolbox utilities on any of my Linux workstations.
maybe somebody can suggest something we didn't try. What we have tried till now:
  • We have excluded it is a licence problem (together witht the support team)
  • Deleting folders under ~/.matlab
  • Reinstalling Matlab
  • Using the option set distcomp.feature('LocalUseMpiexec') to false (or true)
  • startup.m and .bashrc have been cleaned
When I open it, it takes hours to open (if it opens at all). If I control+C the command, I get the following:
>> tic;a=parpool(16,'SpmdEnabled',true);toc
Starting parallel pool (parpool) using the 'local' profile ...
Operation terminated by user during parallel.internal.getJavaFutureResult (line 15)
In parallel.internal.pool.InteractiveClient/waitForSessionCreation (line 649)
sessionFuture, 1, java.util.concurrent.TimeUnit.SECONDS);
In parallel.internal.pool.InteractiveClient/start (line 356)
obj.Session = obj.waitForSessionCreation(sessionFuture, connectionCounter,
In parallel.Pool>iStartClient (line 796)
spmdInitialized = client.start(poolType , numWorkers, cluster, ...
In parallel.Pool.hBuildPool (line 585)
iStartClient(client, 'pool', cluster, guiMode, supportRestart, argsList);
In parallel.internal.pool.doParpool (line 18)
pool = parallel.Pool.hBuildPool(constructorArgs{:});
In parpool (line 98)
pool = parallel.internal.pool.doParpool(varargin{:});
Somebody has an idea what I could check or try?
Raymond Norris
Raymond Norris on 17 Feb 2021
Please contact Technical Support ( to resolve this.

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