Hi Ralph,
Thank you for your response. Really appreciate it as usual. :)
It depends - if you have an environment like slurm, sge, or torque, then we use
that to launch our daemons on each node. Otherwise, we default to using ssh.
Once the daemons are launched, we then tell the daemons what processes each is
to run. So it is a two-stage launch procedure.
Ralph after starting the orte_deamon
1. what is the role of ssh then ?
2. Also i am assuming HNP is created before using ssh. Am i right ?
3. Also Ralph i would to know how i can tell the daemon to run a
process ?
Ralph i am tying to create run a simple experiment where i can create a simple
process between two computer using SSH module without using mpirun. I would to
hack the mpi library so that i can send a simple "Hello World " from process A
running in computer A to process B running in computer B. I would be create
both the process myself. HOPE I AM BEING CLEAR.
Basically what i am saying is i would to create the MPI_COMM_WORLD comprising
of two process Process A and Process B. For that i would to create a functions
called Create_Process_A and Create_Process_B and Send_Message by utilizing Open
MPI source code.
Also, I know i should be looking into PLM subsystem, RMAPS subsystem, ODLS
subsystem, and ORTED subsystem. But Ralph if you guide me a bit i can finish
the experiment with less sleepless night, headache, and stress.
Leo P
On Apr 26, 2010, at 2:22 AM, Leo P. wrote:
Hi everyone,
>
>
>I wanted to know how OpenMPI launches a MPI process in a cluster environment.
>I am assuming if the process lifecycle management it will be using rsh.
>
>
>
>
>Anyhelp would be greatly appreciated.
>
>
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