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OpenMPI

506 bytes added, 10:26, 28 May 2015
<source lang="bash">
module load openmpi-x86_64
mpirun --report-bindings -np 4 relax --multi='mpi4py'
</source>
Output from a machine with: Thread(s) per core: 1, Core(s) per socket: 4, Socket(s): 1
<source lang="text">
mpirun --report-bindings -np 4 relax --multi='mpi4py'
[tomat:28223] MCW rank 2 bound to socket 0[core 2[hwt 0]]: [././B/.]
[tomat:28223] MCW rank 3 bound to socket 0[core 3[hwt 0]]: [./././B]
</source>
Output when running with to many processed from a machine with: Thread(s) per core: 21, Core(s) per socket: 64, Socket(s): 1<source lang="text">mpirun --report-bindings -np 5 relax --multi='mpi4py'[tomat:31434] MCW rank 0 is not bound (or bound to all available processors)[tomat:31434] MCW rank 1 is not bound (or bound to all available processors)[tomat:31434] MCW rank 2is not bound (or bound to all available processors)[tomat:31434] MCW rank 3 is not bound (or bound to all available processors)[tomat:31434] MCW rank 4 is not bound (or bound to all available processors)</source>
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