Parallel Toolbox sets a max of 1 workers on new cluster in R2020b

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Christopher S Reidy 2020-11-4

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https://ww2.mathworks.cn/matlabcentral/answers/636565-parallel-toolbox-sets-a-max-of-1-workers-on-new-cluster-in-r2020b

评论： Christopher S Reidy 2020-11-16

采纳的回答： Aghamarsh Varanasi

Both R2020a and R2020b exhibit this behavior on our new cluster where you start matlab then do >>parpool(10).

It responds "You requested a minimum of 10 workers, but the cluster "local" has the

NumWorkers property set to allow a maximum of 1 workers"

There are 94 cores available to jobs on each node.

In the Environment / Parallel / Create and Manage Clusters, NumWorkers is left blank which is the default setting of number of cores. The difference with this cluster is that Matlab is built on a VM and not on a compute node, like the older one

Our older cluster responds with:

Connected to the parallel pool (number of workers: 10).

ans =

ProcessPool with properties:

Connected: true

NumWorkers: 10

Cluster: local

AttachedFiles: {}

AutoAddClientPath: true

IdleTimeout: 30 minutes (30 minutes remaining)

SpmdEnabled: true

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Christopher S Reidy 2020-11-16

Hi Raymond

It is built on a Centos 7 VM and run on centos 7 compute nodes. The VM has 8 cores and the compute nodes have 94 cores available to Slurm with cgroups

Chris

Christopher S Reidy 2020-11-16

Hi Walter

Yes - good clue - glnxa64. That is the question - which environment variable? We havent found one yet

Thanks, Chris

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采纳的回答

Aghamarsh Varanasi 2020-11-13

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 Hi,

The issue could be with the other applications running in parallel with MATLAB or the system configurations. Hence this cannot be reproduced at our end. I suggest you contact MathWorks support to resolve the issue.

www.mathworks.com/support/contact_us