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Subject: Re: [OMPI users] MPI over tcp
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2012-05-04 06:33:45


Double check that you have firewalls (e.g., iptables) disabled.

On May 3, 2012, at 5:42 PM, Don Armstrong wrote:

> On Thu, 03 May 2012, Rolf vandeVaart wrote:
>> I tried your program on a single node and it worked fine.
>
> It works fine on a single node, but deadlocks when it communicates in
> between nodes. Single node communication doesn't use tcp by default.
>
>> Yes, TCP message passing in Open MPI has been working well for some
>> time.
>
> Ok. Which version(s) of openmpi are you using successfully? [I'm
> assuming that this is in an environment which doesn't use IB.]
>
>> 1. Can you run something like hostname successfully (mpirun -np 10
>> -hostfile yourhostfile hostname)
>
> Yes, but this only shows that processes start and output is returned,
> which doesn't utilize the in-band message passing at all.
>
>> 2. If that works, then you can also run with a debug switch to see
>> what connections are being made by MPI.
>
> You can see the connections being made in the attached log:
>
> [archimedes:29820] btl: tcp: attempting to connect() to [[60576,1],2] address 138.23.141.162 on port 2001
>
>> I would suggest reading through here for some ideas and for the
>> debug switch.
>
> Thanks. I checked the FAQ, and didn't see anything that shed any
> light, unfortunately.
>
>
> Don Armstrong
>
> --
> Fate and Temperament are two words for one and the same concept.
> -- Novalis [Hermann Hesse _Demian_]
>
> http://www.donarmstrong.com http://rzlab.ucr.edu
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-- 
Jeff Squyres
jsquyres_at_[hidden]
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