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From: Jonathan Underwood (jonathan.underwood_at_[hidden])
Date: 2007-06-11 19:05:37

Hi Adrian,

On 11/06/07, Adrian Knoth <adi_at_[hidden]> wrote:
> Which OMPI version?


> > $ perl -e 'die$!=110'
> > Connection timed out at -e line 1.
> Looks pretty much like a routing issue. Can you sniff on eth1 on the
> frontend node?

I don't have root access, so am afraid not.

> > This error message occurs the first time one of the compute nodes,
> > which are on a private network, attempts to send data to the frontend
> > In actual fact, it seems that the error occurs the first time a
> > process on the frontend tries to send data to another process on the
> > frontend.
> What's the exact problem? compute-node -> frontend? I don't think you
> have two processes on the frontend node, and even if you do, they should
> use shared memory.
> > Any advice would be very welcome
> Use tcpdump and/or recompile with debug enabled. In addition, set
> WANT_PEER_DUMP in ompi/mca/btl/tcp/btl_tcp_endpoint.c to 1 (line 120)
> and recompile, thus giving you more debug output.
> Depending on your OMPI version, you can also add
> mpi_preconnect_all=1
> to your ~/.openmpi/mca-params.conf, by this establishing all connections
> during MPI_Init().

OK, will try these things.

> If nothing helps, exclude the frontend from computation.


Thanks for the suggestions!