[mvapich-discuss] Is MVAPICH working?

[Christopher Tanner]

Hello all -

This is my first post to this group and I am a newbie to MVAPICH.
Our cluster has both gigabit ethernet and Infiniband connections.  
Since I was unfamiliar with Infiniband, I simply used MPICH2 with good  
success. However, we paid for the Infiniband connections, so I want to  
use them. So I downloaded and compiled the MVAPICH2 1.0.1 source.

I have a couple issues:
a) I don't know what kind of Infiniband libraries we have (i.e. VAPI,  
uDAPL, Gen2-IB, iWARP). In fact, I don't know what any of those are...  
Does it really matter? I just did the usual 'configure' and 'make'  
with what seemed to be no critical errors during compilation. All of  
the included make.mvapich2.* scripts did not work for one reason or  
another.

b) MVAPICH2 uses an mpd just like MPICH2. Is there a way I can tell if  
the mpiexec compiled from the MVAPICH2 source is really using the  
Infiniband links instead of the ethernet links? I haven't been able to  
see a big speed difference in the MPI applications I executed  
recently. Thus far everything runs the same as when MPICH2 was  
installed...

Thanks guys and sorry for the really newbie questions...

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Chris Tanner
Space Systems Design Lab
Georgia Institute of Technology
christopher.tanner at gatech.edu
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