Ummmm....I sincerely hope you are kidding :-) Is there some reason why you don't just use MPI_Comm_spawn? This is precisely what it was created to do. You can still execute it from a singleton, if you don't want to start your first process via mpirun (and is there some reason why you don't use mpirun???).
Yes, you -could- hack the MPI code to do this. Starting from scratch, with little knowledge of the code base - figure on taking awhile. I could probably come up with a way to do it, but this would have to be a very low priority for me. On Apr 26, 2010, at 12:12 PM, Leo P. wrote: > 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 > what is the role of ssh then ? > Also i am assuming HNP is created before using ssh. Am i right ? > 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 >> de...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/devel > > > _______________________________________________ > devel mailing list > de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/devel
