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
CINECA Systems & Tecnologies Department
Via Magnanelli 6/3, Casalecchio di Reno (BO) Italywww.cineca.it
Tel: +39 051 6171722
g.fatigati [AT] cineca.it