When I try that (on my MacBook Pro w/ 2 procs):
mpirun --mca mpi_yield_when_idle 1 -np 2 pvserver
I still have one CPU pegged at 98%. Are you saying that shouldn't be
the case?
-Randy
On Jun 16, 2009, at 3:47 PM, David Thompson wrote:
I confirm that with mpich2 version 1.0.7, using the default device
(ch3:sock), the load of an idle pvserver is near 0. With ch3:nemesis,
all but one of the processes use a full cpu. With OpenMPI, I think
all
processes use a full cpu.
This is configurable on the mpirun command line:
http://www.open-mpi.org/faq/?category=running#force-aggressive-
degraded
If you set the MCA parameter mpi_yield_when_idle to a non-zero value,
OpenMPI will not aggressively poll inside MPI routines. For example:
mpirun --mca mpi_yield_when_idle 1 -np 4 pvserver
David
In conclusion, if you are running pvserver on a Mac laptop, use
mpich2
with default build options.
-berk
On Mon, Jun 15, 2009 at 9:11 PM, Berk
Geveci<[email protected]> wrote:
For this reason, I use MPICH2 on my MacBook Pro and OpenMPI on my
Mac
Pro. I can't remember which device I ended up settling on - I think
the default. If I remember correctly, ch3:nemesis was causing the
same
issue as OpenMPI.
-berk
On Mon, Jun 15, 2009 at 1:44 PM, Randy
Heiland<[email protected]> wrote:
Thanks Utkarsh. Just to add to this thread, I asked some of the
OMPI
developers and apparently it's not possible to avoid this behavior.
-Randy
On Jun 15, 2009, at 11:35 AM, Utkarsh Ayachit wrote:
Yup, that's expected. That's because of your MPI implementation.
OpenMPI
does a busy wait when waiting for mpi messages. I think there's an
environment variable or something that you can set to disable
that, I am no
sure. Maybe someone on the mailing list knows, or try checking
the OpenMPI
documentation.
Utkarsh
On Mon, Jun 15, 2009 at 11:28 AM, Randy Heiland <[email protected]
> wrote:
When I use 'mpirun -np 2 pvserver' on my dual core MacBook
(either
connecting to it via paraview client or standalone), it keeps
one of my CPUs
pegged at nearly 100%. Is this to be expected? (Just running
the serial
'./pvserver' of course just generates 'Listening...Waiting for
client...'
with no CPU load).
% ./pvserver --version
ParaView3.7
% ompi_info
Open MPI: 1.3.1
thanks, Randy
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