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Subject: Re: [OMPI users] OpenMPI without IPoIB
From: Shamis, Pavel (shamisp_at_[hidden])
Date: 2011-03-13 17:51:59


Please see my comment below.

Pavel (Pasha) Shamis

---
Application Performance Tools Group
Computer Science and Math Division
Oak Ridge National Laboratory
On Mar 11, 2011, at 2:47 PM, Bernardo F Costa wrote:
> I have found this thread form two years ago. I am some kind of lost on
> configuring an infiniband cluster for openmpi. What is best: use iboip
> or use native infiniband ibverbs interface ? For now I am using native
Native openib/verbs interface will work much faster  (up X10) then ipoib.
Ipoib was designed for application that does not have native ip interface/ 
> infiniband withou ipoib. But I have lots of problems specially with
> latency in the cluster.
If you see latency problems over native interface (verbs), then you apparently will
face the same problem with any other application over verbs, including ipoib.
So using ipoib instead of verbs definitely not a work around for you.
I would suggest you to run IB network debug tools , like ibdiagnet , in order to analyze 
your network/latency problems.
Regards,
Pasha