From: mohr@fauia12.informatik.uni-erlangen.de (Marcus Mohr)
Newsgroups: comp.parallel.mpi
Subject: Re: misunderstanding ...processors and processes?
Date: 26 Mar 1999 11:57:10 GMT
Organization: Regionales Rechenzentrum Erlangen, Germany
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References: <922442883.446786@www3.netland.nl> <7dfouf$ic3$1@jura.cc.ic.ac.uk>
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Xref: ukc comp.parallel.mpi:4848


In article <7dfouf$ic3$1@jura.cc.ic.ac.uk>,
	t.kuan@ic.ac.uk writes:
> chiwai <chiwai@datasim.nl> wrote:
>: mpirun -np 4 a.out means run an appllication on 4 processors.. right ?
> 
> yes this is correct.

  Not quite: mpirun -np 4 a.out will start 4 processes all executing
  a.out. To decide on which processors/machines these processes shall
  run, mpirun takes a look at the 

         <mpichdir>/util/machines/machines.<architecture>

  file and tests the machines listed there for availability and creates
  a procgroup file. If you want to have the last word on where the
  processes run you must create your own procgroup file and tell mpirun
  to use it.

  Yours
  Marcus

========================================================================

        Marcus Mohr
   @>   IMMD 10 (Systemsimulation)  -   FAU Erlangen-Nuernberg
  /?    e-mail ... Marcus.Mohr@informatik.uni-erlangen.de
   |\   Tel ...... 09131 / 85 - 28925
        www ...... http://www10.informatik.uni-erlangen.de/users/mohr

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