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I am trying to start parpool with 4 workers but when I execute parpool(4) it only connects me to one worker. Can you provide help regarding this?

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Muhammad Abdullah Hanif
Muhammad Abdullah Hanif on 29 Aug 2017
Answered: Sebastian Castro on 30 Aug 2017
Yesterday parpool was working fine and when I tried to connect to 4 workers I could. But today it is not working and it connects me to only one worker when I execute parpool(4) command

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Answers (1)

Sebastian Castro
Sebastian Castro on 30 Aug 2017
You can check the maximum number of computational threads by typing the following in MATLAB.
>> maxNumCompThreads
Is the output greater than or equal to 4? Note that this function can also be used to set the maximum number of computational threads (see the documentation), but it only lasts during that MATLAB session.
Try restarting MATLAB to see if maybe this was overriden in your current session. Else, if it's a global preference, go to the MATLAB preferences, select "Parallel Computing Toolbox", and check the "Maximum number of computational threads" option there. What does it say?
- Sebastian

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