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Subject: Re: [OMPI users] mpirun runs in serial even I set np to several processors
From: Djordje Romanic (djordje8_at_[hidden])
Date: 2014-04-14 16:27:39


OK guys... Thanks for all this info. Frankly, I didn't know these
diferences between OpenMP and OpenMPI. The commands:
which mpirun
which mpif90
which mpicc
give,
/usr/bin/mpirun
/usr/bin/mpif90
/usr/bin/mpicc
respectively.

A tutorial on how to compile WRF (
http://www.mmm.ucar.edu/wrf/OnLineTutorial/compilation_tutorial.php)
provides a test program to test MPI. I ran the program and it gave me the
output of successful run, which is:
---------------------------------------------
C function called by Fortran
Values are xx = 2.00 and ii = 1
status = 2
SUCCESS test 2 fortran + c + netcdf + mpi
---------------------------------------------
It uses mpif90 and mpicc for compiling. Below is the output of 'ldd
./wrf.exe':

    linux-vdso.so.1 => (0x00007fff584e7000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x00007f4d160ab000)
    libgfortran.so.3 => /usr/lib/x86_64-linux-gnu/libgfortran.so.3
(0x00007f4d15d94000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f4d15a97000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1
(0x00007f4d15881000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f4d154c1000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f4d162e8000)
    libquadmath.so.0 => /usr/lib/x86_64-linux-gnu/libquadmath.so.0
(0x00007f4d1528a000)

On Mon, Apr 14, 2014 at 4:09 PM, Gus Correa <gus_at_[hidden]> wrote:

> Djordje
>
> Your WRF configure file seems to use mpif90 and mpicc (line 115 &
> following).
> In addition, it also seems to have DISABLED OpenMP (NO TRAILING "I")
> (lines 109-111, where OpenMP stuff is commented out).
> So, it looks like to me your intent was to compile with MPI.
>
> Whether it is THIS MPI (OpenMPI) or another MPI (say MPICH, or MVAPICH,
> or Intel MPI, or Cray, or ...) only your environment can tell.
>
> What do you get from these commands:
>
> which mpirun
> which mpif90
> which mpicc
>
> I never built WRF here (but other people here use it).
> Which input do you provide to the command that generates the configure
> script that you sent before?
> Maybe the full command line will shed some light on the problem.
>
>
> I hope this helps,
> Gus Correa
>
>
> On 04/14/2014 03:11 PM, Djordje Romanic wrote:
>
>> to get help :)
>>
>>
>>
>> On Mon, Apr 14, 2014 at 3:11 PM, Djordje Romanic <djordje8_at_[hidden]
>> <mailto:djordje8_at_[hidden]>> wrote:
>>
>> Yes, but I was hoping to get. :)
>>
>>
>> On Mon, Apr 14, 2014 at 3:02 PM, Jeff Squyres (jsquyres)
>> <jsquyres_at_[hidden] <mailto:jsquyres_at_[hidden]>> wrote:
>>
>> If you didn't use Open MPI, then this is the wrong mailing list
>> for you. :-)
>>
>> (this is the Open MPI users' support mailing list)
>>
>>
>> On Apr 14, 2014, at 2:58 PM, Djordje Romanic <djordje8_at_[hidden]
>> <mailto:djordje8_at_[hidden]>> wrote:
>>
>> > I didn't use OpenMPI.
>> >
>> >
>> > On Mon, Apr 14, 2014 at 2:37 PM, Jeff Squyres (jsquyres)
>> <jsquyres_at_[hidden] <mailto:jsquyres_at_[hidden]>> wrote:
>> > This can also happen when you compile your application with
>> one MPI implementation (e.g., Open MPI), but then mistakenly use
>> the "mpirun" (or "mpiexec") from a different MPI implementation
>> (e.g., MPICH).
>> >
>> >
>> > On Apr 14, 2014, at 2:32 PM, Djordje Romanic
>> <djordje8_at_[hidden] <mailto:djordje8_at_[hidden]>> wrote:
>> >
>> > > I compiled it with: x86_64 Linux, gfortran compiler with
>> gcc (dmpar). dmpar - distributed memory option.
>> > >
>> > > Attached is the self-generated configuration file. The
>> architecture specification settings start at line 107. I didn't
>> use Open MPI (shared memory option).
>> > >
>> > >
>> > > On Mon, Apr 14, 2014 at 1:23 PM, Dave Goodell (dgoodell)
>> <dgoodell_at_[hidden] <mailto:dgoodell_at_[hidden]>> wrote:
>> > > On Apr 14, 2014, at 12:15 PM, Djordje Romanic
>> <djordje8_at_[hidden] <mailto:djordje8_at_[hidden]>> wrote:
>> > >
>> > > > When I start wrf with mpirun -np 4 ./wrf.exe, I get this:
>> > > > -------------------------------------------------
>> > > > starting wrf task 0 of 1
>> > > > starting wrf task 0 of 1
>> > > > starting wrf task 0 of 1
>> > > > starting wrf task 0 of 1
>> > > > -------------------------------------------------
>> > > > This indicates that it is not using 4 processors, but 1.
>> > > >
>> > > > Any idea what might be the problem?
>> > >
>> > > It could be that you compiled WRF with a different MPI
>> implementation than you are using to run it (e.g., MPICH vs.
>> Open MPI).
>> > >
>> > > -Dave
>> > >
>> > > _______________________________________________
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>>
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>> > >
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>> >
>> >
>> > --
>> > Jeff Squyres
>> > jsquyres_at_[hidden] <mailto:jsquyres_at_[hidden]>
>>
>> > For corporate legal information go to:
>> http://www.cisco.com/web/about/doing_business/legal/cri/
>> >
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>>
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>>
>> --
>> Jeff Squyres
>> jsquyres_at_[hidden] <mailto:jsquyres_at_[hidden]>
>>
>> For corporate legal information go to:
>> http://www.cisco.com/web/about/doing_business/legal/cri/
>>
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>> users mailing list
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>>
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