mex, mwblas, and multithreading: controlling the number of threads

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dhyun
dhyun 2011-10-5
Hello,
Since maxNumCompThreads is going to be removed, does anyone know of another way to limit the number of cores utilized when calling the MathWorks BLAS library from a mex function?
Right now, I can use maxNumCompThreads(N) to limit my CPU usage to N cores on a shared machine when using ssyrk or dgemm or other useful BLAS functions. I've searched and searched and it doesn't seem like there is going to be a good way to do this without maxNumCompThreads. Are there any options besides "1 thread" and "all threads"?
Thanks, DH

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回答（1 个）

Kaustubha Govind
Kaustubha Govind 2011-10-6
From what I understand, the choice needs to be made at MATLAB startup. Starting MATLAB with the -singleCompThread option will force all operations to run in a single thread.
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Kaustubha Govind
Kaustubha Govind 2011-10-6
From the documentation, it doesn't look like it. But, I'll let others weigh in. (Maybe you can use an OS-level control to restrict the number of threads for your MATLAB process?)
Jan
Jan 2011-10-6
The maxNumCompThreads function has been very useful for limitting the used resources, although some situations cannot be caugth by such a simple mechanism, e.g. if the BLAS functions are called from several threads of a PARFOR loop.
It is very sad, that its support will be finished.

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