MPI_Intercomm_merge is what you are looking for.
Aurelien
Le 26 juil. 08 à 13:23, Mark Borgerding a écrit :
Okay, so I've gotten a little bit closer.
I'm using MPI_Comm_spawn to start several children processes. The
problem is that the children are in their own group, separate from
the parent (just the like the documentation says). I want to merge
the children's group with the parent group so I can efficiently Send/
Recv data between them..
Is this possible?
Plan B: I guess if there is no elegant way to merge all those
processes into one group, I can connect sockets and make intercomms
to talk from the parent directly to each child.
-- Mark
Mark Borgerding wrote:
I am writing a code module that plugs into a larger application
framework. That framework loads my code module as a shared object.
So I do not control how the first process gets started, but I still
want it to be able to start and participate in an MPI group.
Here's roughly what I want to happen ( I think):
framework app running (not under my control)
-> framework loads mycode.so shared object into its process
-> mycode.so starts mpi programs on several hosts
(e.g. via system call to mpiexec )
-> initial mycode.so process participates in the group
he just started (e.g. he shows up in MPI_Comm_group, can use
MPI_Send, MPI_Recv, etc. )
Can this be done?
I am running under Centos 5.2
Thanks,
Mark
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