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Subject: Re: [OMPI users] Connection timed out on TCP and notify question
From: Ralph Castain (rhc_at_[hidden])
Date: 2014-04-24 22:49:26

Sounds like either a routing problem or a firewall. Are there multiple NICs on these nodes? Looking at the quoted NIC in your error message, is that the correct subnet we should be using?

Have you checked to ensure no firewalls exist on that subnet between the nodes?

On Apr 24, 2014, at 8:41 AM, Vince Grimes <tom.grimes_at_[hidden]> wrote:

> Dear all:
> In the ongoing investigation into why a particular in-house program is not working in parallel over multiple nodes using OpenMPI, running with "--mca btl self,sm,tcp" I have been running into the following error:
> [compute-6-15.local][[8185,1],0 [btl_tcp_endpoint.c:653:mca_btl_tcp_endpoint_complete_connect] connect() to failed: Connection timed out (110)
> I thought at first it was due to running out of file handles (sockets are considered files), but I have amended limits.d to allow 102400 files (up from the default of 1024), which should be more than enough.
> What is going on? Trying to connect to 4/20 nodes gave the error above.
> My second question involves the notify system for btl openib. What does the syslog notifier require in order to work? I want to see if the errors running the same program with openib are due to dropped IB connections.
> --
> T. Vince Grimes, Ph.D.
> CCC System Administrator
> Texas Tech University
> Dept. of Chemistry and Biochemistry (10A)
> Box 41061
> Lubbock, TX 79409-1061
> (806) 834-0813 (voice); (806) 742-1289 (fax)
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