Parallel tool fails to starts with 8 workers on 8 core processor

Machine iMac with 3.6 GHs Intel Core i9, 8 cores, 16 threads. Parallel pool starts with up to 7 workers. When I try validate with 8 workers, I get SPMD job test error. Below is the validation report.

What's wrong? Thank you, MIchal

VALIDATION REPORT

Profile: local

Scheduler Type: Local

Stage: Cluster connection test (parcluster)

Status: Passed

Start Time: Wed Sep 11 12:21:13 BST 2019

Finish Time: Wed Sep 11 12:21:13 BST 2019

Running Duration: 0 min 0 sec

Description:

Error Report:

Command Line Output:

Debug Log:

Stage: Job test (createJob)

Status: Passed

Start Time: Wed Sep 11 12:21:13 BST 2019

Finish Time: Wed Sep 11 12:21:21 BST 2019

Running Duration: 0 min 7 sec

Description:

Error Report:

Command Line Output:

Debug Log:

Stage: SPMD job test (createCommunicatingJob)

Status: Failed

Start Time: Wed Sep 11 12:21:21 BST 2019

Finish Time: Wed Sep 11 12:21:23 BST 2019

Running Duration: 0 min 2 sec

Description: Job errored or did not reach the state 'finished'.

Error Report: Job errored or did not reach the state 'finished'.

Command Line Output:

Debug Log: LOG FILE OUTPUT:

[6] Unable to open file for Java VM logging

[6] Fatal Internal Error: std::exception: dlopen(libmwkeybrd_impl.dylib, 6): no suitable image found. Did find:

[6] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: open() failed with errno=23

[6] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: stat() failed with errno=23

[6] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: open() failed with errno=23

[6] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: stat() failed with errno=23

[6] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: open() failed with errno=23

[6] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: open() failed with errno=23

[6] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: stat() failed with errno=23: Too many open files in system

[3] Unable to open file for Java VM logging

[3] Fatal Internal Error: std::exception: dlopen(libmwkeybrd_impl.dylib, 6): no suitable image found. Did find:

[3] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: open() failed with errno=23

[3] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: stat() failed with errno=23

[3] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: open() failed with errno=23

[3] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: stat() failed with errno=23

[3] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: open() failed with errno=23

[3] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: open() failed with errno=23

[3] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: stat() failed with errno=23: Too many open files in system

[1] Unable to open file for Java VM logging

[1] Fatal Internal Error: std::exception: dlopen(libmwkeybrd_impl.dylib, 6): no suitable image found. Did find:

[1] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: open() failed with errno=23

[1] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: stat() failed with errno=23

[1] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: open() failed with errno=23

[1] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: stat() failed with errno=23

[1] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: open() failed with errno=23

[1] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: open() failed with errno=23

[1] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: stat() failed with errno=23: Too many open files in system

[0] Unable to open file for Java VM logging

[0] Fatal Internal Error: std::exception: dlopen(libmwkeybrd_impl.dylib, 6): no suitable image found. Did find:

[0] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: open() failed with errno=23

[0] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: stat() failed with errno=23

[0] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: open() failed with errno=23

[0] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: stat() failed with errno=23

[0] /Applications/MATLAB_R2019a.app/bin/maci64/libmwkeybrd_impl.dylib: open() failed with errno=23

[0] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: open() failed with errno=23

[0] /Applications/MATLAB_R2019a.app/bin/maci64/./libmwkeybrd_impl.dylib: stat() failed with errno=23: Too many open files in system

Stage: Pool job test (createCommunicatingJob)

Status: Skipped

Start Time:

Finish Time:

Running Duration:

Description: Validation skipped due to previous failure.

Error Report:

Command Line Output:

Debug Log:

Stage: Parallel pool test (parpool)

Status: Skipped

Start Time:

Finish Time:

Running Duration:

Description: Validation skipped due to previous failure.

Error Report:

Command Line Output:

Debug Log:

Answer 1

[Ram Vijayaragavan]

Hi Michal,

Refer to Alison's Answer in the following link

https://in.mathworks.com/matlabcentral/answers/341979-matlab-r2017a-9-2-0-538062-crashes-when-calling-functions-from-the-parallel-computing-toolbox-mac#answer_268898.

I think your issue is similar that one.