On Fri, 17 Feb 2006, Jeff Squyres wrote:
> > ARMCI configured for 2 cluster nodes. Network protocol is 'TCP/IP
> > Sockets'.
> ...
> This is the first message from LAM. However, it's somewhat odd.
> This message means the processes all invoked MPI_INIT, which
> surprised me -- based on the messages you showed above, it looked
> like your application was trying to use TCP sockets for communication
> (as opposed to MPI).
Just a note to clarify this: ARMCI[1] can be configured to use MPI
only for the start-up and shutdown phases, therefore getting the
processes started on the nodes via lamd/mpirun, while doing the actual
data communication via its own routines which do not use MPI calls,
but direct TCP/IP, GM, etc. calls.
[1] http://www.emsl.pnl.gov/docs/parsoft/armci/
--
Bogdan Costescu
IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868
E-mail: Bogdan.Costescu_at_[hidden]
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