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Subject: Re: [OMPI users] MPI_Comm_create prevents external socket connections
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-04-28 08:01:18

MPI_Comm_create shouldn't have any effect on existing fd's.

Have you run your code through a memory-checking debugger such as valgrind?

On Apr 28, 2011, at 12:57 AM, Randolph Pullen wrote:

> I have a problem with MPI_Comm_create,
> My server application has 2 processes per node, 1 listener and 1 worker.
> Each listener monitors a specified port for incoming TCP connections with the goal that on receipt of a request it will distribute it over the workers in a SIMD fashion.
> This all works fine unless MPI_Comm_create is called on the listener process. Then after the call the incoming socket cannot be reached by the external client processes. The client reports “”Could’t open socket”. No other error is apparent. I have tried using a variety of different sockets but to no effect.
> I use OpenMPI 1.4.1 on FD10 with vanilla TCP. The install is totally standard with no changes.
> Is this a known issue?
> An help appreciated.
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> users_at_[hidden]

Jeff Squyres
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