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Subject: Re: [OMPI users] BTL layer
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2010-09-22 21:09:57

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 all the same things that MPI_SEND does: eager sends for short messages, striping across multiple devices, using RDMA when appropriate, etc.

Jeff Squyres
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