[mvapich-discuss] [mpich-discuss] mvapich 1.1 and multipath

[Matthew Koop]

Sergey,

Messages are sent based on LIDs and QPs. Right now there is no mechanism
to set output LIDs directly. If you use the VIADEV_USE_LMC=1 (MVAPICH) or
MV2_USE_HSAM=1 (MVAPICH2) it should try to spread traffic for you to
maximize performance.

What is the reason for needing this fine-grained control?

Thanks,

Matt


On Fri, 6 Mar 2009, Sergey wrote:

> Hi, may be anyone know this ? How mpi process addressing the message
> to destination (rank 0 send rank 1)? Through LID, GID, QP ID or
> anything else?  Can I strictly define to mpi process outgoing LIDs ?
> For example, with LMC = 3, a sender of rank 0, lid 1
>                              destination of rank 1 multilid 4
>                              destination of rank 2 multilid 8
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