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Subject: Re: [OMPI users] Problem with MPI_Barrier (Inter-communicator)
From: Edgar Gabriel (gabriel_at_[hidden])
Date: 2012-03-28 17:03:17


it just uses a different algorithm which avoids the bcast on a
communicator of 1 (which is causing the problem here).

Thanks
Edgar

On 3/28/2012 12:08 PM, Rodrigo Oliveira wrote:
> Hi Edgar,
>
> I tested the execution of my code using the option -mca coll ^inter as
> you suggested and the program worked fine, even when I use 1 server
> instance.
>
> What is the modification caused by this parameter? I did not find an
> explanation about the utilization of the module coll inter.
>
> Thanks a lot for your attention and for the solution.
>
> Best regards,
>
> Rodrigo Oliveira
>
> On Tue, Mar 27, 2012 at 1:10 PM, Rodrigo Oliveira
> <rsilva.oliveira_at_[hidden] <mailto:rsilva.oliveira_at_[hidden]>> wrote:
>
>
> Hi Edgar.
>
> Thanks for the response. I just did not understand why the Barrier
> works before I remove one of the client processes.
>
> I tryed it with 1 server and 3 clients and it worked properly. After
> I removed 1 of the clients, it stops working. So, the removal is
> affecting the functionality of Barrier, I guess.
>
> Anyone has an idea?
>
>
> On Mon, Mar 26, 2012 at 12:34 PM, Edgar Gabriel <gabriel_at_[hidden]
> <mailto:gabriel_at_[hidden]>> wrote:
>
> I do not recall on what the agreement was on how to treat the size=1
>
>
>
>
>
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