Parfor hangs during execution
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How i can solve this problem that freeze parfor during execution?
Operation terminated by user during distcomp.remoteparfor/getCompleteIntervals (line 225)
In parallel_function>distributed_execution (line 823)
[tags, out] = P.getCompleteIntervals(chunkSize);
In parallel_function (line 590)
R = distributed_execution(...
回答(6 个)
Gergely Papp
2019-7-2
I have encountered the same issue, both with 2017/b and 2019/a. The calculations launch in the parallel workers, but along the way they hang 1-by-1. They would hang for days if I don't kill them manually.
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Jayaram Theegala
2018-7-16
编辑:Jayaram Theegala
2018-7-16
Hello Andrea,
In order to understand the issue better, can you try reducing the number of iterations on your first loop, by setting "it" variable used in your first "for" loop to 1. Also, it may be helpful to just start your pool with 1 worker, and see if the issue still persists.
If the issue continues to happen even after the above changes, provide the following information:
1) Brief information about the function used within the parfor loop: Algorithms.TeMA.evolution
2) Does the issue happen without the above function?
3) Finally, it is generally advisable for outer-most loop to be parfor and the inner loops being for loops. https://in.mathworks.com/help/distcomp/nested-parfor-loops-and-for-loops.html
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Zachary Eilon
2019-6-26
I am having a similar problem. A simple demo code is shown below, which enters an infinite loop within the parfor. This is on a 2-core MacBook Pro with 3.3 GHz Intel i7 processor. Running Matlab R2017b, but the same code seems to cause problems on a machine running R2019a.
k = 1e10;
tic
for i = 1:k
tan(i);
end
toc
parpool(2);
tic
parfor i = 1:k
tan(i);
end
toc
2 个评论
lingyan yang
2021-1-3
is ther any updates I am encountering same issue with both matlab2019a and matlab 2020b. I am using particle swarm parallel setting, the optimization hangs in the middle of optimization, and won't continue untill i restart the system, very annoying
Nick
2021-5-25
Same with me. Particle swarm function on Matlab 2020b in parallel macbook with 6 cores.
DeepSea
2021-8-15
I've been stucked in this problem for couples of weeks, and fixed it by removing "continue" in an if-judgement and a for-loop.
for CondA
...
if CondB
continue; % Avoid using "continue"
end
...
end
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