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From: Chevchenkovic Chevchenkovic (chevchenkovic_at_[hidden])
Date: 2006-12-04 12:23:26


Hi,
 It is not clear from the code as mentioned by you from
ompi/mca/pml/ob1/ where exactly the selection of BTL bound to a
particular LID occurs. Could you please specify the file/function name
for the same?
 -chev

On 12/4/06, Gleb Natapov <glebn_at_[hidden]> wrote:
> On Mon, Dec 04, 2006 at 01:07:08AM +0530, Chevchenkovic Chevchenkovic wrote:
> > Also could you please tell me which part of the openMPI code needs to
> > be touched so that I can do some modifications in it to incorporate
> > changes regarding LID selection...
> >
> It depend what do you want to do. The part that does RR over all
> available LIDs is in OB1 PML (ompi/mca/pml/ob1/), but the code doesn't
> aware of the fact that it is doing RR over different LIDs and not
> different NICs (yet?).
>
> The code that controls what LIDs will be used is in
> ompi/mca/btl/openib/btl_openib_component.c.
>
> > On 12/4/06, Chevchenkovic Chevchenkovic <chevchenkovic_at_[hidden]> wrote:
> > > Is it possible to control the LID where the send and recvs are
> > > posted.. on either ends?
> > >
> > > On 12/3/06, Gleb Natapov <glebn_at_[hidden]> wrote:
> > > > On Sun, Dec 03, 2006 at 07:03:33PM +0530, Chevchenkovic Chevchenkovic
> > > wrote:
> > > > > Hi,
> > > > > I had this query. I hope some expert replies to it.
> > > > > I have 2 nodes connected point-to-point using infiniband cable. There
> > > > > are multiple LIDs for each of the end node ports.
> > > > > When I give an MPI_Send, Are the sends are posted on different LIDs
> > > > > on each of the end nodes OR they are they posted on the same LID?
> > > > > Awaiting your reply,
> > > > It depend what version of Open MPI your are using. If you are using
> > > > trunk or v1.2 beta then all available LIDs are used in RR fashion. The
> > > early
> > > > versions don't support LMC.
> > > >
> > > > --
> > > > Gleb.
> > > > _______________________________________________
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> > > >
> > >
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> --
> Gleb.
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