When calling the matlabpool to work in parallel, does each worker work in single-thread mode?

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Giovanni De Luca 2013-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/89950-when-calling-the-matlabpool-to-work-in-parallel-does-each-worker-work-in-single-thread-mode

回答： Jill Reese 2013-10-11

Hi, when I call a matlabpool of workers, and each worker has to compute a routine which is optimized by the BLAS subroutines (e.g., the backslash operator), will each workers exploit the multi-thread mode or since I have called the matlabpool each of them will work in single-thread mode? (I assume the multi-thread mode is available for default when lunching MATLAB). Thanks

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Answer 1

Jill Reese 2013-10-11

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Workers are started up in single-thread mode in order to avoid over-subscribing the machine and negatively impacting performance. Backslash would indeed be affected by this since it is multi-threaded by default when launching MATLAB.