Changes between Version 410 and Version 411 of doc/app/initialization_parameters


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Timestamp:
Nov 20, 2018 4:12:22 PM (6 years ago)
Author:
kanani
Comment:

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  • doc/app/initialization_parameters

    v410 v411  
    808808{{{#!td
    809809Set barriers in front of collective MPI operations.\\\\
    810 Depending on the communication network in use, setting of barriers (MPI_BARRIER) in front of collective MPI operations (MPI_ALLTOALL, MPI_ALLREDUCE) may speed up the code, e.g. by a few percent on SGI-ICE-systems with Infiniband fat tree, but only for a larger number of PEs (>= 2048) and if dual rail mode is switched on (default on SGI-systems at HLRN). Therefore, {{{collective_wait}}} is {{{.TRUE.}}} by default on SGI-systems (if hostname(3:5) = "{{{sgi}}}", given with '''mrun'''-option {{{-h}}}), but {{{.FALSE.}}} on all other systems.
     810Depending on the communication network in use, setting of barriers (MPI_BARRIER) in front of collective MPI operations (MPI_ALLTOALL, MPI_ALLREDUCE) may speed up the code, e.g. by a few percent on SGI-ICE-systems with Infiniband fat tree, but only for a larger number of PEs (>= 2048) and if dual rail mode is switched on (default on SGI-systems at HLRN). Therefore, {{{collective_wait}}} is {{{.TRUE.}}} by default on SGI-systems (if hostname(3:5) = "{{{sgi}}}", given with [wiki:doc/app/palmrun palmrun]-option {{{-c}}}), but {{{.FALSE.}}} on all other systems.
    811811}}}
    812812|----------------