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Subject: [OMPI users] very low performance over infiniband
From: Bob Lin (87francium_at_[hidden])
Date: 2013-01-27 03:59:06


Dear developers, I have met a rather weird problem . Our newly assembled
cluster is using openmpi-1.6.3. When doing hpcc test, no err is reported
, the network latency ,bandwith , are quite normal. but the GFlops which
using HPL and MPIFFT is too low , just 2% of the theoretical value.

The system is quite normal ones: Mellanox infiniband QDR switch ,
CentOS 6.2 with OFED-1.5.4

  Now the problem is there is no error reported , so I don't have any
idea about what is wrong.