Open MPI logo

Open MPI Development Mailing List Archives

  |   Home   |   Support   |   FAQ   |  

This web mail archive is frozen.

This page is part of a frozen web archive of this mailing list.

You can still navigate around this archive, but know that no new mails have been added to it since July of 2016.

Click here to be taken to the new web archives of this list; it includes all the mails that are in this frozen archive plus all new mails that have been sent to the list since it was migrated to the new archives.

Subject: Re: [OMPI devel] How is a MPI process launched ?
From: Leo P. (leo_7892003_at_[hidden])
Date: 2010-04-26 14:12:08

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. > > >_______________________________________________ >devel mailing list >devel_at_[hidden] >