How to use -singleCompThread with MATLAB Builder JA ?

Question

Damien 2014-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/158975-how-to-use-singlecompthread-with-matlab-builder-ja

评论： Abhiram Bhanuprakash 2014-10-28

I want to limit the MCR to only one thread. "maxNumCompThreads" function is working but is deprecated, and mcc does not accept "-R singleCompThread" option when building a java library.

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Answer 1

Damien 2014-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/158975-how-to-use-singlecompthread-with-matlab-builder-ja#answer_156861

在 MATLAB Online 中打开

Solved by initialising the MCR on the java side this way:

MWApplication.initialize(new MWMCROption() {
  @Override
    public String[] toStringArray() {
      return new String[] { "-singleCompThread" };
    }
});

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Abhiram Bhanuprakash 2014-10-28

Great! Thanks for sharing!

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Answer 2

Abhiram Bhanuprakash 2014-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/158975-how-to-use-singlecompthread-with-matlab-builder-ja#answer_156859

编辑：Abhiram Bhanuprakash 2014-10-28

Hi Damien,

I think the MCR is by default single-threaded. The same is mentioned in this post.

Thus, I think you need not worry about limiting the number of threads to one.

The above mentioned post also explains how to run multiple MCRs, one per process, if you would like to do that.

Hope this helps,

Cheers!

Abhiram.

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Damien 2014-10-28

Thank you for the answer.

The MCR is single-threaded, but some computations inside the MCR are multi-threaded. This causes contention problems when running several MCR instances on machine with high CPU core number. (which are solved by calling the deprecated "maxNumCompThreads" function at the beginning of the MATLAB script)

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