[BProc] performance issues with Myrinet : latency

[Florent C. <Flo...@un...>]

Hi to all

This is probably a well know issue but since we have installed
Clustermatic  (one version away) the latency of our Myrinet network
has gone way up, from 3-8 microseconds to about 100
for any type of MPI call. I am sure not to have
installed the TCP/IP version (since only two
jobs per card seem to be running at the same time at maximum)
and I suspect the problem comes from dynamic routing.

I tried to download and compile the router given on the clustermatic
home page but fail because of a missing "gm_undocumented_calls.h"
and other errors.

 Is anyone aware of this problem ?
Is it worth upgrading to the last version of clustermatic
as this would probably involve several days of work ?
(we have some local specificities and all our programs run fine excepted 
for one which is
latency bound)



thanks in advance


-- 
Florent Calvayrac  | Tel : 06 64 31 43 86  | http://www.jackywulf.com
Directeur du SC Informatique Ressources Num.  de l'Universite du Maine
Lab. de Physique de l'Etat Condense UMR-CNRS 6087 
Inst. de Rech. en Ingenierie Molec. et Matx Fonctionnels  FR CNRS 2575