How to I pass off a Simulink application command syntax to MATLAB Job Scheduler on a local cluster?

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Ewen Chan
Ewen Chan on 5 Sep 2019
Commented: Ewen Chan on 10 Sep 2019
I have a MATLAB/Simulink application that I normally would call from the MATLAB command window with:
app inputfile.m
And then it would run.
If I want to pass that off to the MATLAB Job Scheduler, how would I go about doing that?
I tried following the help documentation about using the cluster profile, creating the parallel job, and then creating the task, except that in the syntax for createTask(j, F, N...)
I tried to put in the "app inputfile.m" as the function into the createTask function and that didn't work.
What would be the better way for me to pass off "app inputfile.m" to MJS?
Your help is greatly appreciated.
Thank you.

Answers (4)

Edric Ellis
Edric Ellis on 6 Sep 2019
Where do the results from running app inputfile.m go? Does this create variables directly in the base workspace?
To use app together with createTask, you'd probably need to call it like this:
createTask(job, @app, 0, {'inputfile.m'})
However, that might not do what you want. It might work to use the batch command, a bit like this:
job = batch('app inputfile.m');
wait(job), load(job)
If that does work, then you can simply call batch multiple times.
An alternative might be to use parfor to run app in a parallel loop. But that depends a bit on how the outputs of app are produced...
  10 Comments
Ewen Chan
Ewen Chan on 10 Sep 2019
This would mean that I would have to create a M-script that will submit the job, correct?
The other question that I also have was that in the example (re: submitting a job as batch, by right-click on the M-script file), it automatically assigns the ID.
Is there a way to do that programmatically? i.e. instead of:
job_n = batch('app inputfile.m', ...)
that it will automatically assign an ID to it without having to manually specify the ID.
How would I go about doing that?

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Jason Ross
Jason Ross on 5 Sep 2019
Are the parsim or batchsim commands applicable to your workflow? They are designed to parallelize simulations.
  12 Comments
Ewen Chan
Ewen Chan on 9 Sep 2019
Yes, I am running this on WIndows, and to make matters worse, I think that some of the paths might be a mixture of OSes.
But again, it looks like that with the batch submission syntax that I have now, it appears to be working, so it looks like that it was able to take the mixed OS syntax.
Thanks.

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Ewen Chan
Ewen Chan on 9 Sep 2019
Tangential question - my MATLAB R2015a installation is missing the mdce.bat from C:\Program Files\MATLAB\R2015a\toolbox\distcomp\bin.
That file is apparently required to start the mdce service so that I can start MJS.
How can I "backfill" that missing file?
I'm not really sure why it's missing, but it looks like that is needed to start MJS.
Once again, your help would be greatly appreciated.
Thank you.
  2 Comments
Ewen Chan
Ewen Chan on 9 Sep 2019
Ahhh....I might not have much in the way of control over that then because that's handled by the IT administration and the installers are only downloadable by IT, and not by/for end users.
Hmmm....bummer.
Let me talk with my IT to figure out what's going on with that.
Thanks.

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Ewen Chan
Ewen Chan on 10 Sep 2019
So the application ran and I was able to get the results that were written out by the application, but at the end, when MATLAB tries to load the results from the job, this is the error message that I get:
Error using parallel.Job/load (line 33)
Error encountered while running the batch job. The error was:
The task result was too large to be stored.
Caused by:
Error using parallel.internal.cluster.FileSerializer>iSaveMat (line 281)
Data too large to be saved.
Any ideas on how I might be able to resolve this and/or get around it?
Thank you.
  4 Comments
Ewen Chan
Ewen Chan on 10 Sep 2019
Edric:
Thank you.
Sorry, I had missed that.
I thought that I would have to edit my Simulink application code to enable that.
My apologies.

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