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

[Matthew Koop]

Hi Sergey,

As I mentioned earlier, there currently is no method to manually set
routes with MVAPICH or MVAPICH2. Using VIADEV_USE_LMC=1 (MVAPICH)
or MV2_USE_HSAM=1 (MVAPICH2) will attempt to do the best it can.

Thanks,

Matt

On Mon, 9 Mar 2009, Sergey wrote:

> Hi
> Thanks for answer
>  It need for set specific route for specific source-dest. I study in post graduate and it parts of my scientific work.
>  Can I take destLIDs for mpi sender process and exchange it to my specific destLIDs ? I assume it placed in enviroments ?
>  Can MPI process use more than one LID to transmit message to destination rank or sender may use only one LID to transmit ?
>
>  Sorry for my english language
>
>
> > -----Original Message-----
> > From: Matthew Koop <koop at cse.ohio-state.edu>
> > To: Sergey <sssmolniy at mail.ru>
> > Date: Sat, 7 Mar 2009 23:34:47 -0500 (EST)
> > Subject: Re: [mvapich-discuss] [mpich-discuss] mvapich 1.1 and multipath
> >
> > > 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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> > > > mvapich-discuss at cse.ohio-state.edu
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> > > >
> > >
> >
> >
>
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