LAM should work if the data sizes are the same -- it will take care of
the different endian representations for you.
However, your app looks right -- there's no reason that you're getting
bogus rank and size values on 2 out of 3 processes (I assume those are
the alpha processors).
I'm guessing that if you run exclusively on the Alphas, you also get
bogus answers (because the MPI_COMM_SIZE|RANK functions really don't do
any communication; it's just reading the information determined during
MPI_COMM_INIT). Can you verify?
Also, can you verify that you compiled your application with the
"right" mpif77 on the Alphas (i.e., the one that was configured with
g95)? One possible explanation is that you're using a LAM that was
configured with a different fortran compiler, and it has different data
sizes, and therefore didn't interoperate properly in the fortran
translation layer...?
On Aug 22, 2005, at 3:36 AM, Eugen Wintersberger wrote:
> Hi there (sorry I forgot the testing code in my last mail)
> I use LAM MPI (7.1.1) on a Debian Sarge 3.1 System. Since I need the
> Fortran interface I recompiled the library instead of using the Debian
> packages. I use a single Intel P4 PC and two Alpha worstations as a
> (very) small cluster for testing purposes. On all machines Debian 3.1
> is
> used.
> For the PC I used the subsequent configure command:
>
> ./configure --prefix=/mypath/ --with-fc=ifort --with-rsh="ssh -x"
>
> and on the Alpha workstations
>
> ./configure --prefix=/mypath/ --with-fc=g95 --with-rsh="ssh -x"
>
> on all machines make produces no errors. For testing purposes I wrote a
> simple Fortran program (mpi_test.f90) that you will find attached to
> this mail. However, after compilation with (mpif77) I get the following
> output:
>
> eugen_at_hubbard:~/src/mpi_test$ mpirun -np 3 mpi_test
> Processor 0 of 3
> Processor 4294967298 of 2199023255555
> Processor 4294967297 of 2199023255555
> eugen_at_hubbard:~/src/mpi_test$
>
> Obviously rank and size of the MPI environment is not correct on the
> Alpha workstations. Is this a known problem? Did I something wrong
> (maybe with g95)?
>
> best regards
>
> Eugen Wintersberger
> --
> --------------------------------------------
> | |
> | Dipl.- Ing. Eugen Wintersberger |
> | |
> | Department of semiconductor physics |
> | Johannes Kepler University |
> | Altenbergerstr. 69 |
> | A-4040 Linz, Austria |
> | |
> | Tel.: +43 732 2468 9605 |
> | Mobil: +43 664 311 286 1 |
> | |
> | mail: eugen.wintersberger_at_[hidden] |
> | eugen.wintersberger_at_[hidden] |
> | |
> --------------------------------------------
> <mpi_test.f90>_______________________________________________
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--
{+} Jeff Squyres
{+} jsquyres_at_[hidden]
{+} http://www.lam-mpi.org/
|
