No, we do not expose such kind of information to the upper layer. If
you really want I can tell you how to do it in a dirty way, but only
if you really need to know...
george.
On Apr 21, 2009, at 12:14 , Katz, Jacob wrote:
So, sm will never be chosen in this case in the current
implementation, correct?
Is there an API or another method to find out what BTL is currently
used (either inside the application code or externally)?
Thanks.
--------------------------------
Jacob M. Katz | jacob.k...@intel.com | Work: +972-4-865-5726 | iNet:
(8)-465-5726
-----Original Message-----
From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org]
On Behalf Of George Bosilca
Sent: Tuesday, April 21, 2009 17:48
To: Open MPI Users
Subject: Re: [OMPI users] COMM_ACCEPT/COMM_CONNECT: what BTL will
the connected processes use?
With few exceptions, Open MPI will choose the best BTL. There are two
exceptions I know about:
1. sm - we didn't figure out a clean way to do it, nor we spent too
much time trying to
2. elan - the initialization of the device is a global operation, and
we cannot guarantee that all nodes are involved in the accept/connect.
george.
On Apr 21, 2009, at 09:28 , Katz, Jacob wrote:
Hi,
In a dynamically connected client/server-style application, where
the server uses MPI_OPEN_PORT/MPI_COMM_ACCEPT and the client uses
MPI_COMM_CONNECT, what will be the communication method (BTL) chosen
by OMPI? Will the communication thru the resultant inter-
communicator use TCP, or will OMPI choose the best possible method
(e.g. sm if the client and the server are on the same node)?
Thanks.
--------------------------------
Jacob M. Katz | jacob.k...@intel.com | Work: +972-4-865-5726 | iNet:
(8)-465-5726
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