Curious error during parfor loop involving getCompleteIntervals

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Jake 2022-4-22

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https://ww2.mathworks.cn/matlabcentral/answers/1702660-curious-error-during-parfor-loop-involving-getcompleteintervals

评论： MEHEDI HASAN ONI 2023-3-1

I am consistently getting the error below while executing a parfor loop:

Error using distcomp.remoteparfor/getCompleteIntervals(line406)
An unexpected error occurred during PARFOR: Error in remote execution of parfor: Ignoring interval for loop ID: 58689 because executing loop ID:-1

Strangley, the error only occurs sometimes, and it seems to occur at different points within the code (i.e. sometimes the code is 30% completed and others it is 50%...). Also, I noticed that the loop ID (58689 in this example) is different each time I receive the error.

As for the code, I have a series of parfor loops all within a larger for loop. The error can occur within any of the parfor loops (it is not always the same). As the code is thousands of lines, I have provided some pseudocode that I hope will help in identifying the issue.

I am using Matlab 2021b on a 2021 macbook pro.

nt = 1e6;
npts = 2e6;
% Sample Function 
function [a] = myfunc1(in1,in2)
    
    npts = length(in1);
    a = zeros(npts,1);
    parfor j = 1:npts
        a(j,1) = newfunc(in1,in2);
    end
end
for i = 1:nt
    
    in1 = rand(nPts,1);
    in2 = rand(nPts,1);
    
    % function with parfor loop inside
    a = myfunc1(in1,in2);
    
    b = zeros(npts,1);
    % Second parfor loop with function called within parfor loop
    parfor j = 1:npts
        b(j,1) = myfunc2(a(j));
    end
    
    c = zeros(npts,1);
    % Third parfor loop with function called within parfor loop
    parfor j = 1:npts
        c(j,1) = myfunc3(a(j),b(j));
    end
    
end