Re: [OMPI users] MPI_SCAN

You probably want MPI_Reduce, instead. http://www.open-mpi.org/doc/v1.6/man3/MPI_Reduce.3.php On May 15, 2012, at 11:27 PM, Rohan Deshpande wrote: > I am performing Prefix scan operation on cluster > > I have 3 MPI tasks and master task is responsible for distributing the data > > Now,

Re: [OMPI users] MPI - memory sharing?

MPI 2 does not say anything about memory sharing. In Open MPI, each MPI process (i.e., each unique rank in MPI_COMM_WORLD) will have a completely separate memory space. So the malloc() that you do in MCW rank 0 will be totally different than the malloc() that you do in MCW rank 1. Make sense?

Re: [OMPI users] MPI_THREAD_MULTIPLE support not available (OpenMPI-1.4.4)

You shouldn't use MPI_THREAD_MULTIPLE in Open MPI 1.4.x -- you should upgrade to 1.6. THREAD_MULTIPLE is a bit more robust in the 1.6 series for the TCP BTL. See the README for more info on THREAD_MULTIPLE. On May 16, 2012, at 7:17 PM, devendra rai wrote: > Hello Community, > > I just

Re: [OMPI users] MPI - memory sharing?

Yes. thanks :) On Fri, May 18, 2012 at 7:06 AM, Jeff Squyres wrote: > MPI 2 does not say anything about memory sharing. > > In Open MPI, each MPI process (i.e., each unique rank in MPI_COMM_WORLD) > will have a completely separate memory space. So the malloc() that you do >