[petsc-users] Warning while compiling Fortran with PETSc

Satish Balay balay at mcs.anl.gov
Thu Feb 10 10:06:16 CST 2022 

Hm - this is strange.

Do you have 'xauth' installed?

I would make sure xauth is installed, delete ~/.Xauthority - and reboot [or restart the X server]

Yeah - it might not work - but perhaps worth a try..

Or perhaps its not X11 related..

I would also try 'strace' on an application that is producing this message - to see if I can narrow down further..

Do you get this message with both (runs)?:

cd src/ksp/ksp/tutorials
make ex2
mpiexec -n 1 ./ex2
./ex2

Satish

On Thu, 10 Feb 2022, Bojan Niceno wrote:

> Dear both,
> 
> I work on an ASUS ROG laptop and don't use any NFS.  Everything is on one
> computer, one disk.  That is why I couldn't resolve the Invalid Magic
> Cookie, because all the advice I've found about it concerns the remote
> access/display.  It is not an issue for me.  My laptop has an Nvidia
> GeForce RTX graphical card, maybe Ubuntu drivers are simply not able to
> cope with it.  I am out of ideas, really.
> 
> 
>     Cheers,
> 
>     Bojan
> 
> On Thu, Feb 10, 2022 at 4:53 PM Satish Balay <balay at mcs.anl.gov> wrote:
> 
> > Do the compute nodes and frontend share the same NFS?
> >
> > I would try the following [to see if they work):
> >
> > - delete ~/.Xauthority [first check with 'xauth list')
> > - setup ssh to not use X - i.e add the following to ~/.ssh/config
> >
> > ForwardX11 no
> > ForwardX11Trusted no
> >
> > [this can be tailored to apply only to your specific compute nodes - if
> > needed]
> >
> > Satish
> >
> > On Thu, 10 Feb 2022, Matthew Knepley wrote:
> >
> > > On Thu, Feb 10, 2022 at 10:40 AM Bojan Niceno <
> > > bojan.niceno.scientist at gmail.com> wrote:
> > >
> > > > Thanks a lot, now I feel much better.
> > > >
> > > > By the way, I can't get around the invalid magic cookie.  It is
> > occurring
> > > > ever since I installed the OS (Ubuntu 20.04) so I eventually gave up
> > and
> > > > decided to live with it :-D
> > > >
> > >
> > >
> > https://unix.stackexchange.com/questions/199891/invalid-mit-magic-cookie-1-key-when-trying-to-run-program-remotely
> > >
> > >   Thanks,
> > >
> > >     Matt
> > >
> > >
> > > >     Cheers,
> > > >
> > > >     Bojan
> > > >
> > > > On Thu, Feb 10, 2022 at 4:37 PM Matthew Knepley <knepley at gmail.com>
> > wrote:
> > > >
> > > >> On Thu, Feb 10, 2022 at 10:34 AM Bojan Niceno <
> > > >> bojan.niceno.scientist at gmail.com> wrote:
> > > >>
> > > >>> Dear Satish,
> > > >>>
> > > >>> Thanks for the answer.  Your suggestion makes a lot of sense, but
> > this
> > > >>> is what I get as a result of that:
> > > >>>
> > > >>> Running check examples to verify correct installation
> > > >>> Using PETSC_DIR=/home/niceno/Development/petsc-debug and
> > > >>> PETSC_ARCH=arch-linux-c-debug
> > > >>> Possible error running C/C++ src/snes/tutorials/ex19 with 1 MPI
> > process
> > > >>> See http://www.mcs.anl.gov/petsc/documentation/faq.html
> > > >>> Invalid MIT-MAGIC-COOKIE-1 keylid velocity = 0.0016, prandtl # = 1.,
> > > >>> grashof # = 1.
> > > >>> Number of SNES iterations = 2
> > > >>> Possible error running C/C++ src/snes/tutorials/ex19 with 2 MPI
> > processes
> > > >>> See http://www.mcs.anl.gov/petsc/documentation/faq.html
> > > >>> Invalid MIT-MAGIC-COOKIE-1 keylid velocity = 0.0016, prandtl # = 1.,
> > > >>> grashof # = 1.
> > > >>> Number of SNES iterations = 2
> > > >>> Possible error running Fortran example src/snes/tutorials/ex5f with 1
> > > >>> MPI process
> > > >>> See http://www.mcs.anl.gov/petsc/documentation/faq.html
> > > >>> Invalid MIT-MAGIC-COOKIE-1 keyNumber of SNES iterations =     4
> > > >>> Completed test examples
> > > >>>
> > > >>> I am getting the "Possible error running Fortran example" warning
> > with
> > > >>> this.  This somehow looks more severe to me.  But I could be wrong.
> > > >>>
> > > >>
> > > >> You are getting this message because your MPI implementation is
> > printing
> > > >>
> > > >>   Invalid MIT-MAGIC-COOKIE-1 key
> > > >>
> > > >> It is still running fine, but this is an MPI configuration issue.
> > > >>
> > > >>   Thanks,
> > > >>
> > > >>      Matt
> > > >>
> > > >> Any suggestions what to do?
> > > >>>
> > > >>>
> > > >>>     Kind regards,
> > > >>>
> > > >>>     Bojan
> > > >>>
> > > >>>
> > > >>>
> > > >>> On Wed, Feb 9, 2022 at 5:49 PM Satish Balay <balay at mcs.anl.gov>
> > wrote:
> > > >>>
> > > >>>> To clarify:
> > > >>>>
> > > >>>> you are using --download-openmpi=yes with petsc. However you say:
> > > >>>>
> > > >>>> > > The mpif90 command which
> > > >>>> > > I use to compile the code, wraps gfortran with OpenMPI
> > > >>>>
> > > >>>> This suggests a different install of OpenMPI is used to build your
> > code.
> > > >>>>
> > > >>>> One way to resolve this is - delete current build of PETSc - and
> > > >>>> rebuild it with this same MPI [that you are using with your
> > application]
> > > >>>>
> > > >>>> ./configure --with-cc=mpicc --with-cxx=mpicxx --with-fc=mpif90
> > > >>>> --download-fblaslapack --download-metis --download-parmetis
> > --download-cmake
> > > >>>>
> > > >>>> Also PETSc provides makefile format that minimizes such conflicts..
> > > >>>>
> > > >>>>
> > > >>>>
> > https://petsc.org/release/docs/manual/getting_started/#writing-c-c-or-fortran-applications
> > > >>>>
> > > >>>> Satish
> > > >>>>
> > > >>>> On Wed, 9 Feb 2022, Balay, Satish via petsc-users wrote:
> > > >>>>
> > > >>>> > Are you using the same MPI to build both PETSc and your
> > appliation?
> > > >>>> >
> > > >>>> > Satish
> > > >>>> >
> > > >>>> > On Wed, 2022-02-09 at 05:21 +0100, Bojan Niceno wrote:
> > > >>>> > > To whom it may concern,
> > > >>>> > >
> > > >>>> > >
> > > >>>> > > I am working on a Fortran (2003) computational fluid dynamics
> > > >>>> solver,
> > > >>>> > > which is actually quite mature, was parallelized with MPI from
> > the
> > > >>>> > > very beginning and it comes with its own suite of Krylov
> > solvers.
> > > >>>> > > Although the code is self-sustained, I am inclined to believe
> > that
> > > >>>> it
> > > >>>> > > would be better to use PETSc instead of my own home-grown
> > solvers.
> > > >>>> > >
> > > >>>> > > In the attempt to do so, I have installed PETSc 3.16.4 with
> > > >>>> following
> > > >>>> > > options:
> > > >>>> > >
> > > >>>> > > ./configure --with-debugging=yes --download-openmpi=yes
> > --download-
> > > >>>> > > fblaslapack=yes --download-metis=yes --download-parmetis=yes --
> > > >>>> > > download-cmake=yes
> > > >>>> > >
> > > >>>> > > on a workstation running Ubuntu 20.04 LTS.  The mpif90 command
> > which
> > > >>>> > > I use to compile the code, wraps gfortran with OpenMPI, hence
> > the
> > > >>>> > > option "--download-openmpi=yes" when configuring PETSc.
> > > >>>> > >
> > > >>>> > > Anyhow, installation of PETSc went fine, I managed to link and
> > run
> > > >>>> it
> > > >>>> > > with my code, but I am getting the following messages during
> > > >>>> > > compilation:
> > > >>>> > >
> > > >>>> > > Petsc_Mod.f90:18:6:
> > > >>>> > >
> > > >>>> > >    18 |   use PetscMat, only: tMat, MAT_FINAL_ASSEMBLY
> > > >>>> > >       |      1
> > > >>>> > > Warning: Named COMMON block ‘mpi_fortran_bottom’ at (1) shall
> > be of
> > > >>>> > > the same size as elsewhere (4 vs 8 bytes)
> > > >>>> > >
> > > >>>> > > Petsc_Mod.f90 is a module I wrote for interfacing PETSc.  All
> > works,
> > > >>>> > > but these messages give me a reason to worry.
> > > >>>> > >
> > > >>>> > > Can you tell what causes this warnings?  I would guess they
> > might
> > > >>>> > > appear if one mixes OpenMPI with MPICH, but I don't think I even
> > > >>>> have
> > > >>>> > > MPICH on my system.
> > > >>>> > >
> > > >>>> > > Please let me know what you think about it?
> > > >>>> > >
> > > >>>> > >     Cheers,
> > > >>>> > >
> > > >>>> > >     Bojan
> > > >>>> > >
> > > >>>> > >
> > > >>>> > >
> > > >>>> > >
> > > >>>> >
> > > >>>> >
> > > >>>>
> > > >>>
> > > >>
> > > >> --
> > > >> What most experimenters take for granted before they begin their
> > > >> experiments is infinitely more interesting than any results to which
> > their
> > > >> experiments lead.
> > > >> -- Norbert Wiener
> > > >>
> > > >> https://www.cse.buffalo.edu/~knepley/
> > > >> <http://www.cse.buffalo.edu/~knepley/>
> > > >>
> > > >
> > >
> > >
> >
>

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