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Subject: Re: [OMPI users] collective communications broken on more than 4 cores
From: Jonathan Dursi (ljdursi_at_[hidden])
Date: 2009-10-29 10:05:22


On 2009-10-29, at 9:57AM, Vincent Loechner wrote:

[...]
> It seems that the calls to collective communication are not
> returning for some MPI processes, when the number of processes is
> greater or equal to 5. It's reproduceable, on two different
> architectures, with two different versions of OpenMPI (1.3.2 and
> 1.3.3). It was working correctly with OpenMPI version 1.2.7.

> [...]
> GCC version :
> $ mpicc --version
> gcc (Ubuntu 4.4.1-4ubuntu7) 4.4.1

Does it work if you turn off the shared memory transport layer; that is,

mpirun -n 6 -mca btl ^sm ./testmpi

?

    - Jonathan

-- 
Jonathan Dursi <ljdursi_at_[hidden]>