How can I adjust the number of threads for functions based on fftw?

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현탁 박
현탁 박 2024-2-15
评论： Angelo Yeo 2024-2-15
As far as I know, embadded matlab function 'dct' is based on fftw library, and it supports 'Thread-based Environment'.
And I noticed MATLAB proccess automatically use CPU about ~1000% when I use dct function, in thread-based parallel environment, without any other instruction.
How can the function decide the proper number of threads in fft ?
Can I set the number of threads manually to improve the performance?
Thanks.

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回答（1 个）

Angelo Yeo
Angelo Yeo 2024-2-15
You can determine the maximum number of threads with the function "maxNumCompThreads".
See the doc below for more information.
https://www.mathworks.com/help/matlab/ref/maxnumcompthreads.html
  2 个评论
현탁 박
현탁 박 2024-2-15
Thanks.
But I want to know how to set 'exact' threads which the dct function used, not the maximum threads.
When I use fftw in c code, I have to set the number of threads manually via
void fftw_plan_with_nthreads(int nthreads);
And FFTW team suggest that test various trial nthreads to find a effective thread number.
I want to follow that routine, but I cannot even configure the exact threads fftw used, and that's the problem.
Angelo Yeo
Angelo Yeo 2024-2-15
@현탁 박: Would you try to set the number of workers for thread environment with the following commands?
numWorkers = 2;
parpool("Threads", numWorkers)
Note that this feature was introduced from R2022b, and details can be found in the link below.
Release Notes for Parallel Computing Toolbox - MATLAB & Simulink (mathworks.com)

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