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. -Brian
On Mon, Apr 16, 2012 at 11:02 AM, George Bosilca <bosi...@eecs.utk.edu>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 ( > https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/284). > > 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/. > > george. > > 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 > > _______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
