[Beowulf] Puzzling Intel mpi behavior with slurm

Prentice Bisbal pbisbal at pppl.gov
Mon Apr 9 08:04:42 PDT 2018

On 04/09/2018 04:58 AM, Chris Samuel wrote:
> On Saturday, 7 April 2018 5:37:28 AM AEST Prentice Bisbal wrote:
>> To really complicate things, you should look at process management interface
>> (PMI). This is a middle layer between Slurm (or an other scheduler) and the
>> MPI tasks. It's a standardized abstraction layer to make programming MPI
>> implementations and schedulers easier. It also increases startup time of
>> the MPI jobs, which is not insignificant for large jobs.
> Hopefully PMI/PMI2/PMIx decreases the startup time! :-)
I think I meant to say "increases startup performance", or something 
like that. Thanks for catching this error which was the exact opposite 
of what I was trying to say.
> There's a presentation on PMIx (the latest version) here:
> https://slurm.schedmd.com/SC17/PMIx-SC17.pdf
> You need to be careful about the versioning with PMIx and Slurm versions,
> there is information on getting it working on both sites:
> https://slurm.schedmd.com/mpi_guide.html#pmix
> https://pmix.org/support/how-to/slurm-support/
> Hope this helps!
> Chris

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