cygwin/MPI-question

[Matthew Knepley]

On Thu, Oct 16, 2008 at 5:42 AM, Franz Th. Langer <eplanung at t-online.de> wrote:
> Hi Satish,
>
> thanks very much for quick infos!
>
> I understand that I have to use  mpirun or mpiexec.
> (I still dont know how the system knows which procs can be used?)
>
> (in rexecshell one can fill in a list with the node-names)
>
> my questions arise out of the following situation:
>
> under cygwin:
>
> 1. I downloaded Petsc and made the necc. definitions
>
> 2. make all (everything ok!)
>
> 3. make test ( (everything ok!)
>
> under the tests there are also test for parallelizations!
>
> I still dont know how Petsc was doing this tests???

I assume you are using the latest release. In bmake/$PETSC_ARCH/petscconf
there is a definition of MPIRUN (or MPIEXEC) which is the location of that
program and it used to run the test by make.

  Matt

> I may have missed something , but I never found a call to mpirun or mpiexec?
>
> perhaps you can explain it?
>
> Best regards
> Franz
>
>
>
> Satish Balay wrote:
>
> On Thu, 16 Oct 2008, Franz Th. Langer wrote:
>
>
>
> Hi,
>
> System: Windows 2000, cygwin
> parallel computation with MPI
>
> (I am a newcomer to cygwin, I wrote a lot
> of par. progs for VC 6.0 +MPI.)
>
> compiling and linking of my par. petsc-program under cygwin is ok!
>
> I can run the program on 1 proc only!
>
> when I want to use more then 1 proc I am using Rexecshell!
> than the program querries about a wrong commandline?
>
> questions:
>
> -under cygwin: do I have to use  something else than Rexecshell?
> -what has than to be installed/initiated on the other procs?
>
>
> Cygwin is used only to build libraries. If you built PETSc with MPI -
> then you have to use the MPI startup mecanism [i.e mpiexec or mpirun]
> to start parallel MPI jobs.
>
> Satish
>
>
>
>
> --
> Mit freundlichen Grüßen
>
> Dipl.-Ing. Franz Theodor Langer (Geschäftsführer)
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