On Fri, 02 Jun 2006 09:41:30 -0600, Ralph Castain wrote:
I don't remember if it has to be explicitly enabled or not - or if it
only started with a particular 2.6.x release. You might want to check
into it.
There are other factors invovled as well (BIOS settings, for instance).
The kerne
Hi Troy
I'm not sure what iteration of Linux you are using, but the 2.6 kernel
has multi-core scheduling support that is supposed to resolve this
problem. I don't remember if it has to be explicitly enabled or not -
or if it only started with a particular 2.6.x release. You might want
to check
On Fri, 02 Jun 2006 09:15:06 -0600, Troy Telford
wrote:
Can you confirm that your Linux installation thinks that it has 4
processors and will schedule 4 processes simultaneously?
D'oh. Still too early in the morning...
OK, Linux thinks it has two CPUs. Period.
For some reason I forgot tha
On Thu, 01 Jun 2006 18:07:07 -0600, Jeff Squyres (jsquyres)
wrote:
This *sounds* like the classic oversubscription problem: Open MPI's
aggressive vs. degraded operating modes:
http://www.open-mpi.org/faq/?category=running#oversubscribing
Good link; bookmarked for (internal) documentation..
Message-
> From: users-boun...@open-mpi.org
> [mailto:users-boun...@open-mpi.org] On Behalf Of Troy Telford
> Sent: Thursday, June 01, 2006 7:24 PM
> To: us...@open-mpi.org
> Subject: [OMPI users] Open MPI and Dual Core (machinefile)
>
> I'm hoping this is just
I'm hoping this is just user error...
I'm running a single-node job with a node that has two dual-core opterons
(Open MPI 1.0.2).
compiler=gcc 4.1.0
arch=x86_64 (64-bit)
OS=linux 2.6.16
My machine file looked like this:
node1 slots=4
I have an HPL configuration for 4 processors (PxQ=2
