Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

From: Gleb Natapov (glebn_at_[hidden])
Date: 2006-12-04 05:35:19


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.
> > > _______________________________________________
> > > users mailing list
> > > users_at_[hidden]
> > > http://www.open-mpi.org/mailman/listinfo.cgi/users
> > >
> >
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users

--
			Gleb.