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<DIV dir=ltr align=left><SPAN class=896575502-30102006><FONT face=Arial
color=#0000ff size=2>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.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=896575502-30102006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=896575502-30102006><FONT face=Arial
color=#0000ff size=2>Rajeev</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=896575502-30102006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B> owner-mpich-discuss@mcs.anl.gov
[mailto:owner-mpich-discuss@mcs.anl.gov] <B>On Behalf Of
</B>Patrick_Sonntag@gmx.de<BR><B>Sent:</B> Sunday, October 29, 2006 2:02
PM<BR><B>To:</B> mpich-discuss@mcs.anl.gov<BR><B>Cc:</B> frank
Mietke<BR><B>Subject:</B> [MPICH] communication between father and son in
MPI_COMM_SPAWN<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV align=left><FONT face=Arial><SPAN
style="FONT-SIZE: 10pt">Hi,</SPAN></FONT></DIV>
<DIV align=left><BR></DIV>
<DIV align=left><FONT face=Arial><SPAN style="FONT-SIZE: 10pt">I'm
implementing at the moment dynamic process management in MPICH2 for
Infiniband.</SPAN></FONT></DIV>
<DIV align=left><FONT face=Arial><SPAN style="FONT-SIZE: 10pt">Trying to
develop the MPI_COMM_SPAWN I encounte on a problem. To establish communication
over Infiniband between the father and </SPAN></FONT></DIV>
<DIV align=left><FONT face=Arial><SPAN style="FONT-SIZE: 10pt">the son, the
father needs connectinformation from the son and also the son needs
information from father. </SPAN></FONT></DIV>
<DIV align=left><FONT face=Arial><SPAN style="FONT-SIZE: 10pt">Is there a
mechanism in MPICH2 to communicate between father and son? And how can I
synchronize the 2 processgroups?</SPAN></FONT></DIV>
<DIV align=left><BR></DIV>
<DIV align=left><BR></DIV>
<DIV align=left><FONT face=Arial><SPAN
style="FONT-SIZE: 10pt">Thanks,</SPAN></FONT></DIV>
<DIV align=left><BR></DIV>
<DIV align=left><FONT face=Arial><SPAN style="FONT-SIZE: 10pt">Patrick
Sonntag</SPAN></FONT></DIV>
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