On 9/12/2014 9:22 AM, JR Cary wrote:
On 9/12/14, 7:27 AM, Tim Prince wrote:
On 9/12/2014 6:14 AM, JR Cary wrote:
This must be a very old topic.
I would like to run mpi with one process per node, e.g., using
-cpus-per-rank=1. Then I want to use openmp inside of that.
But other times I will
Hmmm...well, the info is there. There is an envar OMPI_COMM_WORLD_LOCAL_SIZE
which tells you how many procs are on this node. If you tell your proc how many
cores (or hwthreads) to use, it would be a simple division to get what you want.
You could also detect the number of cores or hwthreads via
On 9/12/14, 7:27 AM, Tim Prince wrote:
On 9/12/2014 6:14 AM, JR Cary wrote:
This must be a very old topic.
I would like to run mpi with one process per node, e.g., using
-cpus-per-rank=1. Then I want to use openmp inside of that.
But other times I will run with a rank on each physical core.
On 9/12/2014 6:14 AM, JR Cary wrote:
This must be a very old topic.
I would like to run mpi with one process per node, e.g., using
-cpus-per-rank=1. Then I want to use openmp inside of that.
But other times I will run with a rank on each physical core.
Inside my code I would like to detect wh
This must be a very old topic.
I would like to run mpi with one process per node, e.g., using
-cpus-per-rank=1. Then I want to use openmp inside of that.
But other times I will run with a rank on each physical core.
Inside my code I would like to detect which situation I am in.
Is there an open
On Mon, Oct 01, 2007 at 10:39:12AM +0200, Olivier DUBUISSON wrote:
> Hello,
>
> I compile openmpi 1.2.3 with options ./configure --with-threads=posix
> --enable-mpi-thread --enable-progress-threads --enable-smp-locks.
>
> My program has 2 threads (main thread and an other). When i run it, i
> ca
Hello,
I compile openmpi 1.2.3 with options ./configure --with-threads=posix
--enable-mpi-thread --enable-progress-threads --enable-smp-locks.
My program has 2 threads (main thread and an other). When i run it, i
can see 4 threads. I think that two threads are the progress threads, is
it right ?
MPI is process based and not thread based. So there is no way in MPI
to synchronize several threads. Moreover, all threads in a process
will return the same rank [as you noticed].
Synchronizations internal to a process have to be done outside MPI.
Any threading library, such as pthread libr
Hi,
Can I use openmpi API like MPI_Reduce or MPI_Gather to synchronize
multiple theads in a process?
In my test in redhat linux, MPI_Comm_rank return 0 for all threads in
the same process. If I want to use the MPI functions like MPI_Reduce or
MPI_Gather, the rank number shoule be different
