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Subject: [OMPI users] BTL layer
From: Gabriele Fatigati (g.fatigati_at_[hidden])
Date: 2010-09-22 03:46:42


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 routine, performances can have very different
behaviour.

Thanks a lot.

-- 
Ing. Gabriele Fatigati
Parallel programmer
CINECA Systems & Tecnologies Department
Supercomputing Group
Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
www.cineca.it                    Tel:   +39 051 6171722
g.fatigati [AT] cineca.it