To keep this thread updated:
After I posted to the developers list, the community was able to guide
to a solution to the problem:
http://www.open-mpi.org/community/lists/devel/2010/04/7698.php
To sum up:
The extended communication times while using shared memory communication
of openmpi processe
On 4/6/2010 2:53 PM, Jeff Squyres wrote:
>
> Try NetPIPE -- it has both MPI communication benchmarking and TCP
> benchmarking. Then you can see if there is a noticable difference between
> TCP and MPI (there shouldn't be). There's also a "memcpy" mode in netpipe,
> but it's not quite the sam
On Apr 1, 2010, at 4:17 PM, Oliver Geisler wrote:
> > However, reading through your initial description on Tuesday, none of these
> > fit: You want to actually measure the kernel time on TCP communication
> > costs.
>
> Since the problem occurs also on node only configuration and mca-option
> bt
On 4/1/2010 12:49 PM, Rainer Keller wrote:
> On Thursday 01 April 2010 12:16:25 pm Oliver Geisler wrote:
>> Does anyone know a benchmark program, I could use for testing?
> There's an abundance of benchmarks (IMB, netpipe, SkaMPI...) and performance
> analysis tools (Scalasca, Vampir, Paraver, Op
> However, reading through your initial description on Tuesday, none of these
> fit: You want to actually measure the kernel time on TCP communication costs.
>
Since the problem occurs also on node only configuration and mca-option
btl = self,sm,tcp is used, I doubt it has to do with TCP communi
Hello,
On Thursday 01 April 2010 12:16:25 pm Oliver Geisler wrote:
> Does anyone know a benchmark program, I could use for testing?
There's an abundance of benchmarks (IMB, netpipe, SkaMPI...) and performance
analysis tools (Scalasca, Vampir, Paraver, Opt, Jumpshot).
However, reading through you
You could try MPI Test Tool (MTT, http://www.open-mpi.org/projects/mtt/).
2010/4/2 Oliver Geisler
> Does anyone know a benchmark program, I could use for testing?
>
>
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Does anyone know a benchmark program, I could use for testing?
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I have tried up to kernel 2.6.33.1 on both architectures (Core2 Duo and
I5) with the same results. The "slow" results are also appearing for
distribution of processes on the 4 cores one single node.
We use
btl = self,sm,tcp
in
/etc/openmpi/openmpi-mca-params.conf
Distributing several process to eac
I have a very dim recollection of some kernel TCP issues back in some older
kernel versions -- such issues affected all TCP communications, not just MPI.
Can you try a newer kernel, perchance?
On Mar 30, 2010, at 1:26 PM, wrote:
> Hello List,
>
> I hope you can help us out on that one, as
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