Maybe you meant to search for OpenMP instead of Open-MPI.
You can achieve something close to what you want by using OpenMP for
on-node parallelism and MPI for inter-node communication.
On Mon, Apr 16, 2012 at 11:02 AM, George Bosilca <bosilca_at_[hidden]>wrote:
> No currently there is no way in MPI (and subsequently in Open MPI) to
> achieve this. However, in the next version of the MPI standard there will
> be a function allowing processes to shared a memory segment (
> If you like living on the bleeding edge, you can try Brian's branch
> implementing the MPI 3.0 RMA operations (including the shared memory
> segment) from http://svn.open-mpi.org/svn/ompi/tmp-public/mpi3-onesided/.
> On Apr 16, 2012, at 09:52 , jody wrote:
> > Hi
> > In my application i have to generate a large block of data (several
> > gigs) which subsequently has to be accessed by all processes (read
> > only),
> > Because of its size, it would take quite some time to serialize and
> > send the data to the different processes. Furthermore, i risk
> > running out of memory if this data is instantiated more than once on
> > one machine.
> > Does OpenMPI offer some way of sharing data between processes (on the
> > same machine) without needing to send (and therefore copy) it?
> > Or would i have to do this by means of creating shared memory, writing
> > to it, and then make it accessible for reading by the processes?
> > Thank You
> > Jody
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