[MPICH] Development Queries

[David Ashton]

devesh sharma,

The business card is a concept used by all the channels to publish contact
information.  It contains things like the host name, ip addresses, port
number, or other channel specific data needed to establish a connection
between two processes.

The ssm channel uses shared memory queues if the two connecting processes
are on the same host otherwise it uses sockets to connect.  The channel
makes this decision and the two higher layers, MPI and the CH3 device, don't
have any responsibility for this.

-David Ashton

-----Original Message-----
From: owner-mpich-discuss at mcs.anl.gov
[mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of devesh sharma
Sent: Wednesday, June 29, 2005 1:16 AM
To: mpich-discuss at mcs.anl.gov
Subject: [MPICH] Development Queries

Hi everybody,

I have some queries regarding the developement of CH3 device-

1)  In the implementation of ssm channel what is the significance of
'businesscard' and why it is used?

2 ) How ssm channel comes to know whether to Shared memory OR
underling high speed interconnect? Which part of MPICH2 is responsible
for this decision?

Thanks