The parallel pool shut down because the client lost connection to worker

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Corrado 2023-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/2059224-the-parallel-pool-shut-down-because-the-client-lost-connection-to-worker

编辑： Torben Ellegaard Lund 2024-6-28

Related to the question asked in https://it.mathworks.com/matlabcentral/answers/2058094-aws-matlab-parallel-server-what-is-the-best-strategy i followed that strategy just like a PoC (28 Simulations - 28 Workers of 32 - 2 Machine of 16 Workers) but I encounter the following error:

"The parallel pool shut down because the client lost connection to worker 21. Check the network connection or restart the parallel pool with 'parpool'"

I don't understand why there's a newtork connection since MATLAB Simulink has been running on AWS Cloud.

Also, how can I continue execution on the remaining parallel workers even if an error occurs?

Thank you very much

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Corrado 2023-12-12

编辑：Corrado 2023-12-12

在 MATLAB Online 中打开

Hi Damian,

thank you for your suggestions. In the next run, I'll try to activate the debug mode and find the job#.log

I could provide more information about my setup.

I use a MATLAB Client on an EC2 c4.2xlarge 1 TB storage instance and Windows as operating system. From the MATLAB Client I run AWS Parallel Server from Cloud Center. Here I use a Linux EC2 m5.xlarge Headnode and 2 EC2 a set EC2 c6a.8xlarge instances, with a maximum of 16 workers per machine and 1 TB of storage. Both Headnode e Worker Machines run on Linux.

So, I'm using Parallel Server across multiple nodes.

Yes, I'm running Simulink simulations and yes, I can share the following snippet:

nsimulation = 32;
n=nsimulation;
in(1:n) = Simulink.SimulationInput('Name_Simulation');
for k = nsimulation:-1:1
    in(k) = in(k).setBlockParameter('Name_Simulation/V1','Value',num2str(V1(k)));
    in(k) = in(k).setBlockParameter('Name_Simulation/V2','Value',num2str(V2(k)));
    in(k) = in(k).setBlockParameter('Name_Simulation/V3','Value',num2str(V3(k)));
    in(k) = in(k).setBlockParameter('Name_Simulation/V4','Value',num2str(V4(k)));
    in(k) = in(k).setBlockParameter('Name_Simulation/V5','Value',num2str(V5(k)));
    in(k) = in(k).setBlockParameter('Name_Simulation/V6','Value',num2str(V6(k)));
    in(k) = in(k).setBlockParameter('Name_Simulation/V7','Value',num2str(V7(k)));
    in(k) = in(k).setBlockParameter('Name_Simulation/V8','Value',num2str(V8(k)));
end
in = in.setModelParameter('LoggingToFile', 'On', 'LoggingFileName', 'out.mat')
parpool("aws_parallel_server")
out = parsim(in, 'UseFastRestart', 'on', 'ShowProgress','on', 'ShowSimulationManager','on');

Damian Pietrus 2024-1-3

在 MATLAB Online 中打开

Before we try accessing those logs, I have one more thing for you to try since the behavior seems to be similar to an issue I ran into with another user. After starting up your MATLAB client before running any jobs, run the following command:

setenv('MW_PCT_TRANSPORT_HEARTBEAT_INTERVAL', '600')

In this case, we are setting a communication timeout in the cluster to 600 seconds (10 minutes). Try running your code again and let me know how things go. If it's successful, I'll pass it along to our development team

Torben Ellegaard Lund 2024-6-28

编辑：Torben Ellegaard Lund 2024-6-28

在 MATLAB Online 中打开

I had a smimilar problem on my MAcBook Air M2 running Sonoma 14.4.1 and MATLAB R2024a (24.1.0.2537033) where a parfor look kept chrashing. After using

setenv('MW_PCT_TRANSPORT_HEARTBEAT_INTERVAL', '600')

some improvement was seen but it still kept chrashing (although after longer time). I then used the following:

setenv('MW_PCT_TRANSPORT_HEARTBEAT_INTERVAL', '6000')

instead, and I have not experienced any chrashes since. The chrash used to happen both when storing data on a local SSD-harddrive and on an external SSH-harddrive connected via USB-C.

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