parfor is suddenly not supported by thread-based workers anymore.

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Chris Pruefert 2023-7-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2002122-parfor-is-suddenly-not-supported-by-thread-based-workers-anymore

评论： Emili 2023-11-19

I am using a parfor-loop for a parafac and since a week or so, Matlab gives an error that it cannot work with the parfor anymore. I have not changed the code in any way, so I do not know why this error occurs now. Was there an update or change in parafac?

These are the lines that I am using:

parfor i=1:10
    [FactorsNaNFixed{i,1},itNaN{i,1},errNaN{i,1}]=parafac(NaNArray,Comp,Options,const,OldLoadC,FixModeC);
end

and here is the error that is generated:

Error using parafac

Use of function load is not supported on a thread-based worker.

All inputs (NaNArray,Comp,Options,const,OldLoadC,FixModeC) are pre-allocated,so I do not know why this happens, also given that it worked perfectly fine before. Parallel pool on Threads is running normally with 12 workers.

All the best,

Chris

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Ayush 2023-8-22

What MATLAB version were you using? Also, if you could provide the files to reproduce the issue at our end then it would be beneficial.

Emili 2023-11-19

Hello, sorry for jumping it. In a different context, I have the same problem in 2023a and 2023b if I am correct, and the same error message with the function "predict" in the SI toolbox.

I have been using threads since the feature was available with this function and there was no problem in the previous version.

There are other posts related to other functions (https://uk.mathworks.com/matlabcentral/answers/2028350-use-of-function-save-is-not-supported-on-a-thread-based-worker) which may or may not be related to this.

If you could patch it would be great please, thank you very much, because it is much faster to parallelize with treads that with processes in some cases,

Thank you again.

Kind regards

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