[Paraview] [Non-DoD Source] Re: Using 64 or more cores on a single node when running client/server (UNCLASSIFIED)

[Su, Simon M CIV USARMY RDECOM ARL (US)]

CLASSIFICATION: UNCLASSIFIED

A little bit more background information, we were trying to run it on Wai (large SMP machine) and we ran into issue getting more than 64 core for our setup. Let’s see if a simple MPI hello world will show where the limit is coming from. 

thanks
-simon

-----Original Message-----
From: ParaView [mailto:paraview-bounces at paraview.org] On Behalf Of Andy Bauer
Sent: Wednesday, September 13, 2017 12:52 PM
To: Utkarsh Ayachit <utkarsh.ayachit at kitware.com>
Cc: paraview at paraview.org
Subject: [Non-DoD Source] Re: [Paraview] Using 64 or more cores on a single node when running client/server

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If you're running on the DSRCs I'm guessing that the limit is coming from the node selection option (i.e. "#PBS -l select=8:ncpus=36:mpiprocs=8"). mpiprocs here is the number of MPI processes per node while ncpus is the number of cores per node (in this case only nodes that have 36 cores per node will be used. I've never tried having mpiprocs higher than ncpus. I would guess that a simple MPI helloworld would really show whether or not this is where the limit is coming from.


Best,
Andy

On Wed, Sep 13, 2017 at 12:12 PM, Utkarsh Ayachit <utkarsh.ayachit at kitware.com < Caution-mailto:utkarsh.ayachit at kitware.com > > wrote:


	> It should be related to your mpi environment: may be oversubscribing (more
	> than one mpi process by core) is not the default behavior.
	
	I am tempted to second that. There's nothing in ParaView that checks
	how many cores your node has, as a result if there's a cap, it's
	coming from the MPI implementation itself.
	
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