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Subject: Re: [OMPI users] MPI_Comm_spawn lots of times
From: Abhishek Kulkarni (abbyzcool_at_[hidden])
Date: 2009-12-01 18:28:36

On Tue, Dec 1, 2009 at 6:15 PM, Nicolas Bock <nicolasbock_at_[hidden]> wrote:
> After reading Anthony's question again, I am not sure now that we are having
> the same problem, but we might. In any case, the attached example programs
> trigger the issue of running out of pipes. I don't see how orted could, even
> if it was reused. There is only a very limited number of processes running
> at any given time. Once slave terminates, how would it still have open
> pipes? Shouldn't the total number of open files, or pipes, be very limited
> in this situation? And yet, after maybe 20 or so iterations in master.c,
> orted complains about running out of pipes.
> nick

What version of OMPI are you trying it with? I can easily run it up to more
than 200 iterations.

Also, how many nodes are you running this on?

> On Tue, Dec 1, 2009 at 16:08, Nicolas Bock <nicolasbock_at_[hidden]> wrote:
>> Hello list,
>> a while back in January of this year, a user (Anthony Thevenin) had the
>> problem of running out of open pipes when he tried to use MPI_Comm_spawn a
>> few times. As I the thread his started in the mailing list archives and have
>> just joined the mailing list myself, I unfortunately can't reply to the
>> thread. "The thread was titled: Doing a lot of spawns does not work with
>> ompi 1.3 BUT works with ompi 1.2.7".
>> The discussion stopped without really presenting a solution. Is the issue
>> brought up by Anthony fixed? We are running into the same problem.
>> Thanks, nick
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