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Hi Roland,</div>
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<br>
That's fantastic, thanks for linking those files.</div>
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It works as expected with only MPI processes. I am careful in compiling and running with the same (and only) OpenMPI installation on the cluster, so this should be OK.</div>
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Finding a Slurm to SGE conversion table, there is no SGE equivalent to ncpus-per-task from Slurm, rather it is the allocation type of the given parallel environment that does this. I.e. the backend.<br>
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<a href="https://srcc.stanford.edu/sge-slurm-conversion" id="LPlnk">https://srcc.stanford.edu/sge-slurm-conversion</a></div>
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Further, in the submit script of ranger, the crucial line</div>
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<span><span style="color: rgb(106, 153, 85);">#$ -pe @(@PPN_USED@/@NUM_THREADS@)@way @PROCS_REQUESTED@</span></span></div>
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shows that you request @PROCS_REQUESTED@ slots (as I currently have) and the first argument shows that the name of the parallel environment is dependent upon @NUM_THREADS@. From what I take from this, I need to set up a parallel environment that has hardcoded
the number of threads I want per MPI process and then use that parallel environment. I'll see how I go there, but it isn't initially obvious how to do this!</div>
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Cheers,</div>
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Chris<br>
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<hr tabindex="-1" style="display:inline-block; width:98%">
<b>From:</b> Roland Haas<br>
<b>Sent:</b> Thursday, October 07, 2021 06:22<br>
<b>To:</b> Chris Stevens<br>
<b>Cc:</b> users@einsteintoolkit.org<br>
<b>Subject:</b> Re: [Users] Einstein toolkit with Sun Grid Engine
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<div class="PlainText">Hello Chris,<br>
<br>
We used SGE a long time ago on some of the TACC machines.<br>
<br>
You can find an old setup for TACC's Ranger cluster in an old commit<br>
like so:<br>
<br>
git checkout fed9f8d6fae4c52ed2d0a688fcc99e51b94e608e<br>
<br>
and then look at the "ranger" files in OUTDATED subdirectories of<br>
machines, runscripts, submitscripts.<br>
<br>
Having all MPI ranks on a single node might also be caused by using<br>
different MPI stacks when compiling and when running so you must make<br>
sure that the "mpirun" (or equivalent command) you use is the one that<br>
belongs to the MPI library that you used when linking your code.<br>
<br>
Finally you may also have to check if this is an issue with threads and<br>
MPI ranks. Ie I would check if things are still wrong if you use only<br>
MPI processes and no OpenMP threads at all (in that case you would have<br>
to check what SGE counts: threads (cores) or MPI ranks (processes)).<br>
<br>
Yours,<br>
Roland<br>
<br>
> Hi everyone,<br>
> <br>
> I have set up the Einstein toolkit on a local cluster of 20 nodes with the SGE scheduler. I have not seen any examples of this scheduler being used with the Einstein toolkit.<br>
> <br>
> I have managed to get it working; however it seems if I ask for a certain number of slots that requires more than one node, it correctly allocates these, however all processes and threads are run on the one node and is oversubscribed.<br>
> <br>
> My question is whether anybody has used SGE with the Einstein toolkit and if this is a good thing or not? If it is possible, I can send more details if there are people willing to help solve this inter-node communication problem.<br>
> <br>
> Thanks in advance,<br>
> <br>
> Chris<br>
> <br>
> [cid:29d54967-59c8-486e-adea-80af7ce2cc49]<br>
> <br>
> <br>
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> <br>
> <br>
> <br>
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> <br>
> Lecturer in Applied Mathematics<br>
> <br>
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