Re: [OMPI users] BTL layer

On Sep 22, 2010, at 1:53 PM, Gabriele Fatigati wrote: > Thanks Jeff, > > and.. what about RDMA? It works only with point-to-point or also with > collectives? When collectives use the point-to-point sends (e.g., they effectively invoke MPI_SEND as part of MPI_BCAST, for example), that will do a

Re: [OMPI users] BTL layer

Thanks Jeff, and.. what about RDMA? It works only with point-to-point or also with collectives? 2010/9/22 Jeff Squyres > On Sep 22, 2010, at 3:46 AM, Gabriele Fatigati wrote: > > > i'm tuning collectives of OpenMPI 1.4.2 with OTPO. I have a little > question about BTL. This layer is involves ju

Re: [OMPI users] BTL layer

On Sep 22, 2010, at 3:46 AM, Gabriele Fatigati wrote: > i'm tuning collectives of OpenMPI 1.4.2 with OTPO. I have a little question > about BTL. This layer is involves just in point-to-point communication or > also in collectives routines? > > Because i've noted that changing some blt parameter

[OMPI users] BTL layer

Dear all, i'm tuning collectives of OpenMPI 1.4.2 with OTPO. I have a little question about BTL. This layer is involves just in point-to-point communication or also in collectives routines? Because i've noted that changing some blt parameters like btl_sm_eager_limit and doing one collective routi