Hi Vipin ,
Thanks alot for the reply.
I went through the FAQ and it also answered some of my questions.

But my problem is, since I am using TCP/Ethernet  I guess that MPI uses SSH/RSH to communicate between peers.
And for that, each peer should have the copy of the application right?

I use 1.2.7rc2 (from Debian/Lenny repo) , and I didn't see the option "--preload-binary" , is it because the lower version?

Bets regards,
umanga.



vipin kumar wrote:
Hi,
I am not expert, I am user like you but I think I can help you,

Q. After installing OpenMPI on each machine ,do i need to run a service/daemon on each machine?
Ans. No, not at all, Open MPI takes care of that for you.

Q. How does peers in MPI environment communicate ?
Ans. Using Communicator(name of the group of processes to whom it belongs, technically handle) and rank of the process in that Communicator.

Q. After implementing parallel program , do I have to install the application on every machine ?
Ans. Not necessary. Use "--preload-binary" option while launching the application through mpirun or mpiexec.

Useful links:
1. http://www.open-mpi.org/faq/?category=running#simple-spmd-run
2. http://www.open-mpi.org/faq/
3. man page for mpirun

Regards,
Vipin K.

On Mon, Jun 29, 2009 at 8:21 AM, Ashika Umanga Umagiliya <aumanga@biggjapan.com> wrote:
Greeting all,

I am new to Open MPI and I have some newbie questions. I have given 4 machines at our laboratory to set up Open MPI.Our net work is simply TCP/Ethernet running Debian Linux.

1) After installing OpenMPI on each machine ,do i need to run a service/daemon on each machine? (How does peers in MPI environment communicate ?)

2) After implementing parallel program , do I have to install the application on every machine ? (I thought the program automatically propagated to other peers , like in RMI applications? )



Thanks in advance,
Umanga


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--
Vipin K.
Research Engineer,
C-Dot, Bangalore, India

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