Fail to start parpool with workers more than 32

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yanci zhang
yanci zhang 2023-12-26
编辑： Matthew 2024-5-7
I have been attempting to enable a parallel pool with multiple workers on my local machine. The parallel pool launches normally with 12 workers, but I encounter an error when I try to increase the number to 32. Here are some reference details: Local hardware configuration: CPU(s) = 336, available memory = 694GB MATLAB version: matlab2023b The error message for the 32 workers Parallel pool test is as follows:
Error Report: Failed to initialize the interactive session.
Caused by: Error using parallel.internal.pool.AbstractInteractiveClient>iThrowIfBadParallelJobStatus The interactive communicating job failed with no message.
Interactive client bound to URL: tcp://tcpnodelay=localhost:27370/protocol/catapult and port 27370 Session failed to start when creating InteractiveClient. Error: Error using parallel.internal.pool.AbstractInteractiveClient>iThrowWithCause Failed to initialize the interactive session.
Has anyone encountered a similar issue? I believe that local hardware resources should not be a limiting factor for utilizing more workers, but why am I unable to use more than 12 workers?

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回答（1 个）

Sachin
Sachin 2023-12-29
Hi Yanci,
To address the issue you are experiencing, I kindly suggest performing the following troubleshooting steps in the MATLAB Command Window:
>> restoredefaultpath
>> savepath
After completing these steps, I recommend restarting MATLAB. Once MATLAB has been restarted, attempt to initiate a parallel pool once more.
Should you encounter an error related to the inability to access the file located at C:\Program Files\MATLAB\R2023b\toolbox\local\pathdef.m, it may be necessary to remove the pathdef.m file.
Doing so will allow MATLAB to recreate it upon the next execution of the relevant command.
You may also refer the following MATLAB Answer : https://in.mathworks.com/matlabcentral/answers/1948303-error-using-parpool-parallel-pool-failed-to-start-with-the-following-error-for-more-detailed-info?s_tid=answers_rc1-2_p2_MLT
I trust that the provided solution will assist in resolving your query.
Thanks
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yanci zhang
yanci zhang 2024-1-4
It should also be noted that the CPU I am currently using is an AMD EPYC 9634 84-Core Processor.

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