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From: Shai Venter (venters_at_[hidden])
Date: 2007-07-17 10:54:25


Hello Mr. Squyres, Team,
 
I know you guys are busy. Any attention to my questions will be mostly
appreciated.
Is there a FAQ for mtt? May be some of my Q have been answered before.
 
I intend to run mtt and test some performance over Infiniband. My setup
is a 2-Dell uni-core machines (i.e.: sw160,sw170) running SLES10.0. Each
host has an Infiniband HCA Card installed. Each HCA Card has 2 Physical
ports which are assigned unique IP's (i.e.: 11.4.3.160,12.4.3.160 and
11.4.3.170,12.4.3.170 respectively)
Ports are connected back-to-back (port1 <-> port1 and port2 <-> port2)
 
 
Q #1: Can I override INI file value for hostlist in command line? If
yes, please provide example.
 
Q #2: In your opinion, what should I specify to hostlist in order to run
mpi jobs over my Infiniband fabric?
Is it hostlist = sw160 sw170
Is it hostlist = 11.4.3.160 12.4.3.160 11.4.3.170 12.4.3.170
 
Q #3: How do I determine which Interfaces mpi uses?
 
 
Q #4: How can I determine max num of processes for my setup? In the case
of hostlist = sw160 sw170 , mtt will evaluate max_np to 2.
In the case of hostlist = 11.4.3.160 12.4.3.160 11.4.3.170 12.4.3.170 ,
max_np will result to 4.
 
Q #5: I what terms can I ask mtt to use a local scratch directory on one
of the host' s hard drive as oppose to some shared scratch folder on
Network file system.
 
Shai Venter
Q.A
Mellanox Technologies, Ltd.
www.mellanox.com
+972 (0)4 9097200 ext. 252
+972 (0)50 2888637