Hans-Nikolai Viessmann
bde174b726
refactor CSCS and Meg content add merlin6 quick start update merlin6 nomachine docs give the userdoc its own color scheme we use the Materials default one refactored slurm general docs merlin6 add merlin6 JB docs add software support m6 docs add all files to nav vibed changes #1 add missing pages further vibing #2 vibe #3 further fixes
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Intel MPI Support
This document describes which set of Intel MPI versions in PModules are supported in the Merlin6 cluster.
Usage
srun
We strongly recommend the use of srun over mpirun or mpiexec. Using srun would properly
bind tasks in to cores and less customization is needed, while mpirun and mpiexec might need more advanced
configuration and should be only used by advanced users. Please, always adapt your scripts for using srun
before opening a support ticket. Also, please contact us on any problem when using a module.
!!! tip Always run Intel MPI with the srun command. The only exception is for advanced users, however srun is still recommended.
When running with srun, one should tell Intel MPI to use the PMI libraries provided by Slurm. For PMI-1:
export I_MPI_PMI_LIBRARY=/usr/lib64/libpmi.so
srun ./app
Alternatively, one can use PMI-2, but then one needs to specify it as follows:
export I_MPI_PMI_LIBRARY=/usr/lib64/libpmi2.so
export I_MPI_PMI2=yes
srun ./app
For more information, please read Slurm Intel MPI Guide
!!! note Please note that PMI2 might not work properly in some Intel MPI versions. If so, you can either fallback to PMI-1 or to contact the Merlin administrators.