Changes between Version 17 and Version 18 of Public/ParaStationMPI


Ignore:
Timestamp:
Apr 7, 2020, 8:41:42 AM (4 years ago)
Author:
Simon Pickartz
Comment:

Some details on environment variables influencing the CUDA awareness in PS-MPI

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  • Public/ParaStationMPI

    v17 v18  
    102102}}}
    103103Please note that CUDA-awareness might impact the MPI performance on systems parts where CUDA is not used.
    104 Therefore, it might be useful (and the other way around necessary) to disable/enable the CUDA-awareness by setting this environment variable:
    105 {{{
    106 PSP_CUDA=0|1
     104Therefore, it might be useful (and the other way around necessary) to disable/enable the CUDA-awareness.
     105Furthermore, additional optimisations such as GPUDirect, i.e., direct RMA transfers to/from CUDA device memory, are available with certain pscom plugins depending on the underlying hardware.
     106The following environment variables may be used to influence the CUDA awareness in !ParaStation MPI
     107{{{
     108PSP_CUDA=0|1 # disable/enable CUDA awareness
     109PSP_UCP=1    # support GPUDirect via UCX in InfiniBand networks (e.g., this is currently true for the ESB nodes)
    107110}}}
    108111