Why is a multithreaded mex function slower when I used a parallel pool?

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Bart Vermeulen 2015-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/257849-why-is-a-multithreaded-mex-function-slower-when-i-used-a-parallel-pool

评论： Walter Roberson 2016-1-15

When I run a multithreaded mex function after having used a parallel pool, my function runs a lot slower (10-20x slowdown). Also, the more threads, the slower the function becomes.

Shutting down the pool does not help.

Rebooting Matlab restores the original speed (and scalability) of the mex Function.

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Bart Vermeulen 2016-1-15

Even after shutting down the parallel pool, the mex file runs much slower

Walter Roberson 2016-1-15

I have a vague memory that someone else might have reported something like this a few years ago, but I am not sure I could find the posting. This is something I would recommend creating a support case for.

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