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Subject: Re: [OMPI users] Communications Problems when application distributed over different nodes
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-01-18 18:31:27


Do you have the Linux firewall running on either of your machines,
perchance? This can either block random socket connections between
nodes (which Open MPI's TCP communication will use) or eat the
connection requests in a black-hole fashion such that the connections
will timeout.

On Jan 16, 2008, at 5:35 AM, Roland Albrecht wrote:

> Hello
>
> I'm running an FDTD programm (meep) using open-mpi on a mini-cluster
> consisting of 2 computers. Since the exchange of the mainbord on the
> node (with an identical one as before) I have a problem. I can't
> find the change in the configurations which is now causing the
> problen.
>
> Here's my problem:
> I can start the meep application by mpi-run on each node
> individually and the program runs without any problems.
> However when I try to run the program distributed over both
> computers I get at some point the following error message:
> ...[0,1,1][btl_tcp_endpoint.c:
> 572:mca_btl_tcp_endpoint_complete_connect] connect() failed with
> errno=110
> Which translates by Perl as: Connection timed out at -e line 1.
>
> However I can't figure out where the problem lies in my network
> configuration. SSH tunnels from one computer to another works. I
> also can reach the internet from the node.
>
> In the attached archive there's the config.log from the top open-mpi
> tree, there's the output of ompi_info --all and there's the network
> configuration of both computers.
>
> I'm really greatfull for any help. Thank you!
>
> Best regards
> Roland Albrecht
>
> --
> ___________________________________________
>
> Roland Albrecht, Dipl. Phys. ETH
> -------------------------------------------
>
> Universität des Saarlandes
> Fachrichtung 7.3 (Technische Physik)
> AG Prof. Dr. Christoph Becher
> Campus E2.6, Zimmer 2.04
> D-66123 Saarbrücken
> Germany
>
> Phone:+49(0)681 302 3418
> Fax: +49(0)681 302 4676
> skype: roland_albrecht
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-- 
Jeff Squyres
Cisco Systems