r HPC with containers.
Ralph
On Mar 25, 2017, at 8:07 AM, Jordi Guitart wrote:
Hi,
I don't have previous expertise on the source code of OpenMPI, so I don't have
a clear idea of the needed changes to implement this feature. This probably
requires some preliminary brainstorming to decide
Hi,
On 27/03/2017 17:51, Jeff Squyres (jsquyres) wrote:
1. Recall that sched_yield() has effectively become a no-op in newer Linux kernels.
Hence, Open MPI's "yield when idle" may not do much to actually de-schedule a
currently-running process.
Yes, I'm aware of this. However, this should imp
=1 is precisely the “oversubscribed”
setting. So why would you expect different results?
On Mar 27, 2017, at 3:52 AM, Jordi Guitart <mailto:jordi.guit...@bsc.es>> wrote:
Hi Ben,
Thanks for your feedback. As described here
(https://www.open-mpi.org/faq/?category=running#oversubscrib
(P#54)
L2 L#27 (256KB) + L1d L#27 (32KB) + L1i L#27 (32KB) + Core L#27
PU L#54 (P#27)
PU L#55 (P#55)
On 26/03/2017 9:37, Ben Menadue wrote:
On 26 Mar 2017, at 2:22 am, Jordi Guitart <mailto:jordi.guit...@bsc.es>> wrote:
However, what is puzzling me is the performance diffe
g HT is not a performance win for MPI/HPC codes that are designed to run
processors at 100%.
On Mar 24, 2017, at 6:45 AM, Jordi Guitart wrote:
Hello,
I'm running experiments with BT NAS benchmark on OpenMPI. I've identified a
very weird performance degradation of OpenM
are memory
even if they have different IP addresses.
On 24/03/2017 20:10, Jeff Squyres (jsquyres) wrote:
On Mar 24, 2017, at 6:41 AM, Jordi Guitart wrote:
Docker containers have different IP addresses, indeed, so now we know why it
does not work. I think that this could be a nice feature for O
Hello,
I'm running experiments with BT NAS benchmark on OpenMPI. I've
identified a very weird performance degradation of OpenMPI v1.10.2 (and
later versions) when the system is oversubscribed. In particular, note
the performance difference between 1.10.2 and 1.10.1 when running 36 MPI
process
ning: no work has been done to make Open MPI understand Docker shared memory
(i.e., you're the first person to ask about it). Pull requests would always be
appreciated. ;-)
On Mar 24, 2017, at 5:47 AM, Jordi Guitart wrote:
Hello John,
Yes, in fact, I'm comparing Docker wit
answer to your question. However have you looked at
Singularity:
http://singularity.lbl.gov/
On 24 March 2017 at 08:54, Jordi Guitart <mailto:jordi.guit...@bsc.es>> wrote:
Hello,
Docker allows several containers running in the same host to share
the same IPC namespace,
Hello,
Docker allows several containers running in the same host to share the
same IPC namespace, thus they can share memory (see example here:
https://github.com/docker/docker/pull/8211#issuecomment-56873448). I
assume this could be used by OpenMPI to communicate MPI processes
running in dif
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