What I am asking is if I use MPI_Send and MPI_Recv between processes in
a node, does it mean using shared memory or not? if not, how to use
shared memory among processes which are runing in a node?
From: Eugene Loh <Eugene.Loh_at_[hidden]>
To: Open MPI Users <users_at_[hidden]>
Sent: Thursday, April 23, 2009 1:20:05 PM
Subject: Re: [OMPI users] SHARED Memory----------------
Just to clarify (since "send to self" strikes me as confusing)...
If you're talking about using shared memory for point-to-point MPI
message passing, OMPI typically uses it automatically between two
processes on the same node. It is *not* used for a process sending to
itself. There is a well-written FAQ (in my arrogant opinion!) at
http://www.open-mpi.org/faq/?category=sm -- e.g.,
If you're talking about some other use of shared memory, let us know
what you had in mind.
Elvedin Trnjanin wrote:
Shared memory is used for send-to-self scenarios such as if you're
making use of multiple slots on the same machine.
shan axida wrote:
Any body know how to make use of shared memory in OpenMPI