[mvapich-discuss] How would IB problems impact performance on a single node?

[Mehmet Belgin]

Greetings!

I am troubleshooting a slowness issue on a single 16core node. Compared 
to profiling data I had from earlier, I can very clearly see that the 
slowness is caused by MPI routines (MPI send rate dropped from 21M/s to 
13M/s) for the very same code. The memory and CPU profiles of the code 
look identical.

I was wondering if IB problems would have any impact at all, despite the 
fact that I am not using network (using single node). I would not expect 
it to be a factor, but asking just in case. I will now run a few OSU 
benchmarks, but will appreciate any other suggestions you might have.

(using mvapich2/2.1 with intel/15.0 on a 16-core intel node)

Thanks!
-Mehmet
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