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Subject: Re: [OMPI devel] poor btl sm latency
From: Matthias Jurenz (matthias.jurenz_at_[hidden])
Date: 2012-02-28 07:36:56


When using Open MPI v1.4.5 I get ~1.1us. That's the same result as I get with
Open MPI v1.5.x using mpi_yield_when_idle=0.
So I think there is a bug in Open MPI (v1.5.4 and v1.5.5rc2) regarding to the
automatic performance mode selection.

When enabling the degraded performance mode for Open MPI 1.4.5
(mpi_yield_when_idle=1) I get ~1.8us latencies.

Matthias

On Tuesday 28 February 2012 06:20:28 Christopher Samuel wrote:
> On 13/02/12 22:11, Matthias Jurenz wrote:
> > Do you have any idea? Please help!
>
> Do you see the same bad latency in the old branch (1.4.5) ?
>
> cheers,
> Chris