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

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