How do I specify the number of workers to be used in my Simulink batch job?

I am trying to pass in a cluster object to the "batchsim" command and I see that the number of workers used by my simulation job object and the cluster object do not match.

myCluster =

Local Cluster

Properties:
Profile: local
Modified: false
Host: localhost
NumWorkers: 16
NumThreads: 1
simJob =Job
ID: 23
Type: independent
NumWorkers: 1
Username: user
State: running
SubmitDateTime: 27-Feb-2024 16:12:40
StartDateTime:
Running Duration: 0 days 0h 0m 0s

Why does this mismatch exist? Does "batchsim" not use all the workers available in the cluster it occurs on?

Answer 1

[MathWorks Support Team]

"Batchsim" will have to be instructed specifically to use a certain number of workers from its cluster. In order to do this, please use the "Pool" name-value argument shown in the documentation page of "batchsim".

https://www.mathworks.com/help/simulink/slref/batchsim.html#mw_5318c4bc-c9ee-45f6-824f-75e148305b3b

The "Pool" name-value argument specifies the number of workers you want your simulation job object created by "batchsim" to use.

Please note that if you specify N workers in the "Pool" name-value argument, your cluster will need to have N+1 workers available since the 1 extra worker required will be the one running the batch.

The following line of code should solve this issue:

simJob = batchsim(myCluster, simInputs, "Pool", 15);