Re: [OMPI users] Hardware topology influence

2022-09-15 Thread Matias Vara via users
Hello Lucas, Le mar. 13 sept. 2022 à 14:23, Lucas Chaloyard via users < users@lists.open-mpi.org> a écrit : > Hello, > > I'm working as a research intern in a lab where we're studying > virtualization. > And I've been working with several benchmarks using OpenMPI 4.1.0 (ASKAP, > GPAW and Incompac

Re: [OMPI users] Hardware topology influence

2022-09-14 Thread Jeff Squyres (jsquyres) via users
starts; it's nothing that the application itself needs to do. -- Jeff Squyres jsquy...@cisco.com From: users on behalf of Gilles Gouaillardet via users Sent: Tuesday, September 13, 2022 9:07 AM To: Open MPI Users Cc: Gilles Gouaillardet Subject: Re: [OMPI

Re: [OMPI users] Hardware topology influence

2022-09-13 Thread Jeff Squyres (jsquyres) via users
that the application itself needs to do. -- Jeff Squyres jsquy...@cisco.com From: users on behalf of Gilles Gouaillardet via users Sent: Tuesday, September 13, 2022 9:07 AM To: Open MPI Users Cc: Gilles Gouaillardet Subject: Re: [OMPI users] Hardware topology inf

Re: [OMPI users] Hardware topology influence

2022-09-13 Thread Gilles Gouaillardet via users
Lucas, the number of MPI tasks started by mpirun is either - explicitly passed via the command line (e.g. mpirun -np 2306 ...) - equals to the number of available slots, and this value is either a) retrieved from the resource manager (such as a SLURM allocation) b) explicitly set in a

[OMPI users] Hardware topology influence

2022-09-13 Thread Lucas Chaloyard via users
Hello, I'm working as a research intern in a lab where we're studying virtualization. And I've been working with several benchmarks using OpenMPI 4.1.0 (ASKAP, GPAW and Incompact3d from Phrononix Test suite). To briefly explain my experiments, I'm running those benchmarks on several virtual