[MPICH] communication between father and son in MPI_COMM_SPAWN

[Rajeev Thakur]

You can see how it's done for the sock channel and try to do the same for
Infiniband. It's implemented in terms of connect-accept. The root processes
on both sides create a temporary communicator between just the two of them.
They exchange information using this temporary communictor in order to
create the real communicator. The temp comm is then destroyed.
 
Rajeev
 


  _____  

From: owner-mpich-discuss at mcs.anl.gov
[mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Patrick_Sonntag at gmx.de
Sent: Sunday, October 29, 2006 2:02 PM
To: mpich-discuss at mcs.anl.gov
Cc: frank Mietke
Subject: [MPICH] communication between father and son in MPI_COMM_SPAWN


Hi,

I'm implementing at the moment dynamic process management in MPICH2 for
Infiniband.
Trying to develop the MPI_COMM_SPAWN I encounte on a problem. To establish
communication over Infiniband between the father and 
the son, the father needs connectinformation from the son and also the son
needs information from father. 
Is there a mechanism in MPICH2 to communicate between father and son? And
how can I synchronize the 2 processgroups?


Thanks,

Patrick Sonntag

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