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Subject: Re: [OMPI users] very low performance over infiniband
From: John Hearns (hearnsj_at_[hidden])
Date: 2013-01-27 06:39:10


2 percent?

Have you logged into a compute node and run a simple top when the job is
running?
Are all the processes distributed across the CPU cores?
Are the processes being pinned properly to a core? Or are they hopping from
core to core?

Also make SURE all nodes havenooted with all cores online and all report
the same amount of RAM