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Ada:Recommended Settings for Large Jobs

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Recommended Settings for Large Jobs

For jobs larger than 1000 cores (50+ nodes), the following MPI settings are recommended to reduce the MPI startup time:

 export I_MPI_HYDRA_BOOTSTRAP=lsf
 export I_MPI_HYDRA_BRANCH_COUNT=XXX
 export I_MPI_LSF_USE_COLLECTIVE_LAUNCH=1

The XXX number should match the number of nodes (#Nodes = #Cores / #CoresPerNode) that your job will request.