Sounds like there are different mingw tools and msys2 tools.

So I guess one could use mingw compilers even from cygwin [using cygwin tools] 
- i.e mingw compilers don't really need msys2 tools to work.

Satish

On Sun, 5 Jul 2020, Paolo Lampitella wrote:

> Unfortunately, even PETSC_ARCH=i didn't work out. And while 
> with-single-library=0 wasn't really appealing to me, it worked but only to 
> later fail on make test.
> 
> I guess all these differences are due to the fortran bindings and/or gcc 10.
> 
> However, until I discover how they are different, I guess I'll be fine with 
> /usr/bin/ar
> 
> Paolo
> 
> 
> 
> Inviato da smartphone Samsung Galaxy.
> 
> 
> 
> -------- Messaggio originale --------
> Da: Paolo Lampitella <paololampite...@hotmail.com>
> Data: 05/07/20 14:00 (GMT+01:00)
> A: Pierre Jolivet <pierre.joli...@enseeiht.fr>
> Cc: Matthew Knepley <knep...@gmail.com>, petsc-users <petsc-users@mcs.anl.gov>
> Oggetto: RE: [petsc-users] PETSc and Windows 10
> 
> Thank you very much Pierre.
> 
> I'll keep you informed in case I see any relevant change from the tests when 
> using your suggestion.
> 
> Paolo
> 
> 
> 
> Inviato da smartphone Samsung Galaxy.
> 
> 
> 
> -------- Messaggio originale --------
> Da: Pierre Jolivet <pierre.joli...@enseeiht.fr>
> Data: 05/07/20 13:45 (GMT+01:00)
> A: Paolo Lampitella <paololampite...@hotmail.com>
> Cc: Matthew Knepley <knep...@gmail.com>, petsc-users <petsc-users@mcs.anl.gov>
> Oggetto: Re: [petsc-users] PETSc and Windows 10
> 
> Hello Paolo,
> 
> On 5 Jul 2020, at 1:15 PM, Paolo Lampitella 
> <paololampite...@hotmail.com<mailto:paololampite...@hotmail.com>> wrote:
> 
> Dear all,
> 
> I just want to update you on my journey to PETSc compilation in Windows under 
> MSYS2+MINGW64
> 
> Unfortunately, I haven’t been able to compile petsc-slepc trough Freefem but, 
> as my final goal required also Fortran bindings (but I only needed blas, 
> lapack, metis and hypre), I decided to follow my own route using the useful 
> information from Pierre.
> 
> 
>   *   I started by installing MPI from 
> https://www.microsoft.com/en-us/download/details.aspx?id=100593. I don’t 
> think the SDK is actually needed in my specific workflow, but I installed it 
> as well together with mpisetup.
>   *   Then I installed MSYS2 just following the wizard. Opened the MSYS2 
> terminal and updated with pacman -Syuu, closed if asked, reopened it and used 
> again pacman -Syuu several times until no more updates were available. Closed 
> it and opened it back.
>   *   Under the MSYS2 terminal installed just the following packages:
> 
> 
> 
>      *   pacman -S base-devel git gcc gcc-fortran
>      *   pacman -S mingw-w64-x86_64-toolchain
>      *   pacman -S mingw-w64-x86_64-cmake
>      *   pacman -S mingw-w64-x86_64-msmpi
> 
> 
> 
>   *   Closed the MSYS2 terminal and opened the MINGW64 one, went to 
> /mingw64/include and compiled my mpi module following 
> https://www.scivision.dev/windows-mpi-msys2/:
> 
> 
> 
>      *   gfortran -c mpi.f90 -fno-range-check -fallow-invalid-boz
> 
> 
> However, I will keep an eye on the MS-MPI GitHub repository because the 
> fortran side seems to be far from perfect.
> 
> 
>   *   Then I downloaded the 3.13.3 version of petsc and configured it, still 
> under the MINGW64 terminal, with the following command:
> 
> 
> /usr/bin/python ./configure --prefix=/home/paolo/petsc --with-ar=/usr/bin/ar
> --with-shared-libraries=0 --with-debugging=0 --with-windows-graphics=0 
> --with-x=0
> COPTFLAGS="-O3 -mtune=native"
> CXXOPTFLAGS="-O3 -mtune=native"
> FOPTFLAGS="-O3 -mtune=native"
> FFLAGS=-fallow-invalid-boz
> --with-mpiexec="/C/Program\ Files/Microsoft\ MPI/Bin/mpiexec"
> --download-fblaslapack --download-metis --download-hypre
> --download-metis-cmake-arguments='-G "MSYS Makefiles"'
> --download-hypre-configure-arguments="--build=x86_64-linux-gnu 
> --host=x86_64-linux-gnu"
> 
> Note that I just bypassed uninstalling python in mingw64 (which doesn’t work) 
> by using /usr/bin/python and that, as opposed to Pierre, I needed to also use 
> the MSYS2 archiver (/usr/bin/ar) as opposed to the mingw64 one 
> (/mingw64/bin/ar that shows up in the Pierre configure) as also mentioned 
> here 
> http://hillyuan.blogspot.com/2017/11/build-petsc-in-windows-under-mingw64.html,
>  probably because of this issue 
> https://stackoverflow.com/questions/37504625/ar-on-msys2-shell-receives-truncated-paths-when-called-from-makefile.
> 
> You are right that you can avoid deinstalling mingw-w64-x86_64-python if you 
> can supply the proper Python yourself (we don’t have that luxury in our 
> Makefile).
> If you want to avoid using that AR, and stick to /mingw64/bin/ar (not sure 
> what the pros and cons are), you can either:
> - use another PETSC_ARCH (very short, like pw, for petsc-windows);
> - use --with-single-library=0.
> See this post on GitLab 
> https://gitlab.com/petsc/petsc/-/issues/647#note_373507681
> The OS I’m referring to is indeed my Windows + MSYS2 box.
> 
> Thanks,
> Pierre
> 
> Then make all, make install and make check all went smooth. Also, I don’t 
> know exactly what with-x=0 and with-windows-graphics=0 do, but I think it is 
> stuff that I don’t need (yet configure worked with windows-graphics as well).
> 
> 
>   *   Finally I launched make test. As some tests failed, I replicated the 
> same install procedure on all the systems I have available on this same 
> Windows machine (Ubuntu 20.04 and Centos 8 under a VirtualBox 6.0.22 VM, 
> Ubuntu 20.04 under WSL1 and the MSYS2-MINGW64 toolchain). I am attaching a 
> file with the results printed to screen (not sure about which file should be 
> used for a comparison/check). Note, however, that the tests in MSYS2 started 
> with some cyclic reference issues for some .mod files, but this doesn’t show 
> up in any file I could check.
> 
> 
> I am still left with some doubts about the archiver, the cyclic reference 
> errors and the differences in the test results, but I am able to link my code 
> with petsc. Unfortunately, as this Windows porting is part of a large code 
> restructuring, I can’t do much more with it, now, from my code. But if you 
> can suggest some specific tutorial to use as test also for the parallel, I 
> would be glad to dig deeper into the matter.
> 
> Best regards
> 
> Paolo
> 
> Inviato da Posta<https://go.microsoft.com/fwlink/?LinkId=550986> per Windows 
> 10
> 
> Da: Pierre Jolivet<mailto:pierre.joli...@enseeiht.fr>
> Inviato: martedì 30 giugno 2020 15:22
> A: Paolo Lampitella<mailto:paololampite...@hotmail.com>
> Cc: Matthew Knepley<mailto:knep...@gmail.com>; 
> petsc-users<mailto:petsc-users@mcs.anl.gov>
> Oggetto: Re: [petsc-users] PETSc and Windows 10
> 
> Please use the 3.13.2 tarball, this was fixed by Satish in the previous 
> commit I already linked 
> (https://gitlab.com/petsc/petsc/-/commit/2cd8068296b34e127f055bb32f556e3599f17523).
> (If you want FreeFEM to do the dirty work for you, just switch to the develop 
> branch, and redo “make petsc-slepc”)
> But I think you’ve got everything you need now for a smooth compilation :)
> 
> Thanks,
> Pierre
> 
> 
> On 30 Jun 2020, at 3:09 PM, Paolo Lampitella 
> <paololampite...@hotmail.com<mailto:paololampite...@hotmail.com>> wrote:
> 
> Dear Pierre,
> 
> thanks for the fast response. Unfortunately it still fails, but now in the 
> configure of ScaLAPACK
> (which means that it went ok for slepc, tetgen, metis, parmetis, ptscotch, 
> superlu and suitesparse).
> 
> The way I applied the modification is by manually editing the Makefile in the 
> 3rdparty/ff-petsc folder, adding -fallow-invalid-boz to both CFLAGS and 
> FFLAGS (this entry added by me). Then executed make petsc-slepc.
> 
> As my project is much less ambitious, I have a good feeling that I will be 
> able to use your Makefile successfully, but as I am kind of slow I tought 
> that it would have been useful for you to know. The configure.log is 
> attached. This time the error is:
> 
> Rank mismatch between actual argument at (1) and actual argument at (2) 
> (scalar and rank-1)
> 
> in subroutine pclarf.f of ScaLAPACK.
> 
> However, before attampting with my project, I have few questions about your 
> Makefile, in particular this piece:
> 
> --with-mpi-lib=/c/Windows/System32/msmpi.dll 
> --with-mpi-include=/home/paolo/FreeFem-sources/3rdparty/include/msmpi 
> --with-mpiexec="/C/Program\ Files/Microsoft\ MPI/Bin/mpiexec"
> 
> I see from MPI.py that I should not use ‘--with-mpi-lib/include’ if I want to 
> use my now working mpi wrappers. Is this correct?
> 
> Paolo
> 
> Inviato da Posta<https://go.microsoft.com/fwlink/?LinkId=550986> per Windows 
> 10
> 
> Da: Pierre Jolivet<mailto:pierre.joli...@enseeiht.fr>
> Inviato: lunedì 29 giugno 2020 21:37
> A: Paolo Lampitella<mailto:paololampite...@hotmail.com>
> Cc: Matthew Knepley<mailto:knep...@gmail.com>; 
> petsc-users<mailto:petsc-users@mcs.anl.gov>
> Oggetto: Re: [petsc-users] PETSc and Windows 10
> 
> I do not give up easily on Windows problems:
> 1) that’s around 50% of our (FreeFEM) user-base (and I want them to use PETSc 
> and SLEPc, ofc…)
> 2) most people I work with from corporations just have Windows 
> laptops/desktops and I always recommend MSYS because it’s very lightweight 
> and you can pass .exe around
> 3) I’ve bothered enough Satish, Jed, and Matt on GitLab to take (at least 
> partially) the blame now when it doesn’t work on MSYS
> 
> That being said, the magic keyword is the added flag 
> FFLAGS="-fallow-invalid-boz" (see, I told you ./configure issues were easier 
> to deal with than the others).
> Here you’ll see that everything goes through just fine (sorry, it took me a 
> long time to post this because everything is slow on my VM):
> 1) http://jolivet.perso.enseeiht.fr/win10/configure.log
> 2) http://jolivet.perso.enseeiht.fr/win10/make.log (both steps #1 and #2 in 
> MSYS terminal, gcc/gfortran 10, MS-MPI see screenshot)
> 3) http://jolivet.perso.enseeiht.fr/win10/ex2.txt (Command Prompt, 4 
> processes + MUMPS, I can send you the .exe if you want to try on your machine)
> I just realize that I didn’t generate the Fortran bindings, but you can see I 
> compiled MUMPS and ScaLAPACK, so that shouldn’t be a problem.
> Or if there is a problem, we will need to fix this in PETSc.
> 
> I’ll push this added flag to the FreeFEM repo, thanks for reminding me of the 
> brokenness of gcc/gfortran 10 + MS-MPI.
> Here is to hoping this won’t affect PETSc ./configure with previous 
> gcc/gfortran version (unlikely, this option is apparently 13-year old 
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=29471)
> 
> Let me know of the next hiccup, if any.
> Thanks,
> Pierre
> 
> 
> 
> On 29 Jun 2020, at 8:09 PM, Paolo Lampitella 
> <paololampite...@hotmail.com<mailto:paololampite...@hotmail.com>> wrote:
> 
> Dear Pierre,
> 
> thanks again for your time
> 
> I guess there is no way for me to use the toolchain you are using (I don’t 
> remember having any choice on which version of MSYS or GCC I could install)
> 
> Paolo
> 
> Inviato da Posta<https://go.microsoft.com/fwlink/?LinkId=550986> per Windows 
> 10
> 
> Da: Pierre Jolivet<mailto:pierre.joli...@enseeiht.fr>
> Inviato: lunedì 29 giugno 2020 20:01
> A: Matthew Knepley<mailto:knep...@gmail.com>
> Cc: Paolo Lampitella<mailto:paololampite...@hotmail.com>; 
> petsc-users<mailto:petsc-users@mcs.anl.gov>
> Oggetto: Re: [petsc-users] PETSc and Windows 10
> 
> 
> 
> 
> 
> 
> On 29 Jun 2020, at 7:47 PM, Matthew Knepley 
> <knep...@gmail.com<mailto:knep...@gmail.com>> wrote:
> 
> On Mon, Jun 29, 2020 at 1:35 PM Paolo Lampitella 
> <paololampite...@hotmail.com<mailto:paololampite...@hotmail.com>> wrote:
> Dear Pierre, sorry to bother you, but I already have some issues. What I did:
> 
> 
>   *   pacman -R mingw-w64-x86_64-python mingw-w64-x86_64-gdb (is gdb also 
> troublesome?)
>   *   Followed points 6 and 7 at 
> https://doc.freefem.org/introduction/installation.html#compilation-on-windows
> 
> I first got a warning on the configure at point 6, as –disable-hips is not 
> recognized. Then, on make ‘petsc-slepc’ of point 7 (no SUDO=sudo flag was 
> necessary) I got to this point:
> 
> tar xzf ../pkg/petsc-lite-3.13.0.tar.gz
> patch -p1 < petsc-suitesparse.patch
> patching file petsc-3.13.0/config/BuildSystem/config/packages/SuiteSparse.py
> touch petsc-3.13.0/tag-tar
> cd petsc-3.13.0 && ./configure MAKEFLAGS='' \
>         --prefix=/home/paolo/freefem/ff-petsc//r \
>         --with-debugging=0 COPTFLAGS='-O3 -mtune=generic' CXXOPTFLAGS='-O3 
> -mtune=generic' FOPTFLAGS='-O3 -mtune=generic' --with-cxx-dialect=C++11 
> --with-ssl=0 --with-x=0 --with-fortran-bindings=0 --with-shared-libraries=0 
> --with-cc='gcc' --with-cxx='g++' --with-fc='gfortran' 
> CXXFLAGS='-fno-stack-protector' CFLAGS='-fno-stack-protector' 
> --with-scalar-type=real --with-mpi-lib='/c/Windows/System32/msmpi.dll' 
> --with-mpi-include='/home/paolo/FreeFem-sources/3rdparty/include/msmpi' 
> --with-mpiexec='/C/Program\ Files/Microsoft\ MPI/Bin/mpiexec' 
> --with-blaslapack-include='' 
> --with-blaslapack-lib='/mingw64/bin/libopenblas.dll' --download-scalapack 
> --download-metis --download-ptscotch --download-mumps --download-hypre 
> --download-parmetis --download-superlu --download-suitesparse 
> --download-tetgen --download-slepc '--download-metis-cmake-arguments=-G "MSYS 
> Makefiles"' '--download-parmetis-cmake-arguments=-G "MSYS Makefiles"' 
> '--download-superlu-cmake-arguments=-G "MSYS Makefiles"' '--
 download-hypre-configure-arguments=--build=x86_64-linux-gnu 
--host=x86_64-linux-gnu' PETSC_ARCH=fr
> ===============================================================================
>              Configuring PETSc to compile on your system
> ===============================================================================
> TESTING: FortranMPICheck from 
> config.packages.MPI(config/BuildSystem/config/pack*******************************************************************************
>          UNABLE to CONFIGURE with GIVEN OPTIONS    (see configure.log for 
> details):
> -------------------------------------------------------------------------------
> Fortran error! mpi_init() could not be located!
> *******************************************************************************
> 
> make: *** [Makefile:210: petsc-3.13.0/tag-conf-real] Errore 1
> 
> Note that I didn’t add anything to any PATH variable, because this is not 
> mentioned in your documentation.
> 
> On a side note, this is the same error I got when trying to build PETSc in 
> Cygwin with the default OpenMPI available in Cygwin.
> 
> I am attaching the configure.log… it seems to me that the error comes from 
> the configure trying to include the mpif.h in your folder and not using the 
> -fallow-invalid-boz flag that I had to use, for example, to compile mpi.f90 
> into mpi.mod
> 
> But I’m not sure why this is happening
> 
> Pierre,
> 
> Could this be due to gcc 10?
> 
> Sorry, I’m slow. You are right. Our workers use gcc 9, everything is fine, 
> but I see on my VM which I updated that I use gcc 10 and had to disable 
> Fortran, I guess the MUMPS run I showcased was with a prior PETSc build.
> I’ll try to resolve this and will keep you posted.
> They really caught a lot of people off guard with gfortran 10…
> 
> Thanks,
> Pierre
> 
> 
> 
> 
> Executing: gfortran -c -o /tmp/petsc-ur0cff6a/config.libraries/conftest.o 
> -I/tmp/petsc-ur0cff6a/config.compilers 
> -I/tmp/petsc-ur0cff6a/config.setCompilers 
> -I/tmp/petsc-ur0cff6a/config.compilersFortran 
> -I/tmp/petsc-ur0cff6a/config.libraries  -Wall -ffree-line-length-0 
> -Wno-unused-dummy-argument -O3 -mtune=generic   
> -I/home/paolo/FreeFem-sources/3rdparty/include/msmpi 
> /tmp/petsc-ur0cff6a/config.libraries/conftest.F90
> Possible ERROR while running compiler: exit code 1
> stderr:
> C:/msys64/home/paolo/FreeFem-sources/3rdparty/include/msmpi/mpif.h:227:36:
> 
>   227 |        PARAMETER (MPI_DATATYPE_NULL=z'0c000000')
>       |                                    1
> Error: BOZ literal constant at (1) is neither a data-stmt-constant nor an 
> actual argument to INT, REAL, DBLE, or CMPLX intrinsic function [see 
> '-fno-allow-invalid-boz']
> C:/msys64/home/paolo/FreeFem-sources/3rdparty/include/msmpi/mpif.h:303:27:
> 
>   303 |        PARAMETER (MPI_CHAR=z'4c000101')
>       |                           1
> Error: BOZ literal constant at (1) is neither a data-stmt-constant nor an 
> actual argument to INT, REAL, DBLE, or CMPLX intrinsic function [see 
> '-fno-allow-invalid-boz']
> C:/msys64/home/paolo/FreeFem-sources/3rdparty/include/msmpi/mpif.h:305:36:
> 
>   305 |        PARAMETER (MPI_UNSIGNED_CHAR=z'4c000102')
>       |                                    1
> 
>   Thanks,
> 
>      Matt
> 
> Thanks
> 
> Paolo
> 
> Inviato da Posta<https://go.microsoft.com/fwlink/?LinkId=550986> per Windows 
> 10
> 
> Da: Pierre Jolivet<mailto:pierre.joli...@enseeiht.fr>
> Inviato: lunedì 29 giugno 2020 18:34
> A: Paolo Lampitella<mailto:paololampite...@hotmail.com>
> Cc: Satish Balay<mailto:ba...@mcs.anl.gov>; 
> petsc-users<mailto:petsc-users@mcs.anl.gov>
> Oggetto: Re: [petsc-users] PETSc and Windows 10
> 
> 
> 
> On 29 Jun 2020, at 6:27 PM, Paolo Lampitella 
> <paololampite...@hotmail.com<mailto:paololampite...@hotmail.com>> wrote:
> 
> I think I made the first step of having mingw64 from msys2 working with 
> ms-mpi.
> 
> I found that the issue I was having was related to:
> 
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91556
> 
> and, probably (but impossible to check now), I was using an msys2 and/or 
> mingw mpi package before this fix:
> 
> https://github.com/msys2/MINGW-packages/commit/11b4cff3d2ec7411037b692b0ad5a9f3e9b9978d#diff-eac59989e3096be97d940c8f47b50fba
> 
> Admittedly, I never used gcc 10 before on any machine. Still, I feel that 
> reporting that sort of error in that way is,
> at least, misleading (I would have preferred the initial implementation as 
> mentioned in the gcc bug track).
> 
> A second thing that I was not used to, and made me more uncertain of the 
> procedure I was following, is having to compile myself the mpi module. There 
> are several version of this out there, but I decided to stick with this one:
> 
> https://www.scivision.dev/windows-mpi-msys2/
> 
> even if there seems to be no need to include -fno-range-check and the current 
> mpi.f90 version is different from the mpif.h as reported here:
> 
> https://github.com/microsoft/Microsoft-MPI/issues/33
> 
> which, to me, are both signs of lack of attention on the fortran side by 
> those that maintain this thing.
> 
> In summary, this is the procedure I followed so far (on a 64 bit machine with 
> Windows 10):
> 
> 
>   *   Install MSYS2 from https://www.msys2.org/ and just follow the install 
> wizard
>   *   Open the MSYS2 terminal and execute: pacman -Syuu
>   *   Close the terminal when asked and reopen it
>   *   Keep executing ‘pacman -Syuu’ until nothing else needs to be updated
>   *   Close the MSYS2 terminal and reopen it (I guess because was in paranoid 
> mode), then install packages with:
> 
> 
> pacman -S base-devel git gcc gcc-fortran bsdcpio lndir pax-git unzip
> pacman -S mingw-w64-x86_64-toolchain
> pacman -S mingw-w64-x86_64-msmpi
> pacman -S mingw-w64-x86_64-cmake
> pacman -S mingw-w64-x86_64-freeglut
> pacman -S mingw-w64-x86_64-gsl
> pacman -S mingw-w64-x86_64-libmicroutils
> pacman -S mingw-w64-x86_64-hdf5
> pacman -S mingw-w64-x86_64-openblas
> pacman -S mingw-w64-x86_64-arpack
> pacman -S mingw-w64-x86_64-jq
> 
> This set should include all the libraries mentioned by Pierre and/or used by 
> his Jenkins, as the final scope here is to have PETSc and dependencies 
> working. But I think that for pure MPI one could stop to msmpi (even, maybe, 
> just install msmpi and have the dependencies figured out by pacman). 
> Honestly, I don’t remember the exact order I used to install the packages, 
> but this should not affect things. Also, as I was still in paranoid mode, I 
> kept executing ‘pacman -Syuu’ after each package was installed. After this, 
> close the MSYS2 terminal.
> 
> 
>   *   Open the MINGW64 terminal and create the .mod file out of the mpi.f90 
> file, as mentioned here https://www.scivision.dev/windows-mpi-msys2/, with:
> 
> 
> cd /mingw64/include
> gfortran mpif90 -c -fno-range-check -fallow-invalid-boz
> 
> Ah, yes, that’s new to gfortran 10 (we use gfortran 9 on our workers), which 
> is now what’s ship with MSYS2 (we haven’t updated yet). Sorry that I forgot 
> about that.
> 
> This is needed to ‘USE mpi’ (as opposed to INCLUDE ‘mpif.h’)
> 
> 
>   *   Install the latest MS-MPI (both sdk and setup) from 
> https://www.microsoft.com/en-us/download/details.aspx?id=100593
> 
> 
> At this point I’ve been able to compile (using the MINGW64 terminal) 
> different mpi test programs and they run as expected in the classical Windows 
> prompt. I added this function to my .bashrc in MSYS2 in order to easily copy 
> the required dependencies out of MSYS:
> 
> function copydep() { ldd $1 | grep "=> /$2" | awk '{print $3}' | xargs -I 
> '{}' cp -v '{}' .; }
> 
> which can be used, with the MINGW64 terminal, by navigating to the folder 
> where the final executable, say, my.exe, resides (even if under a Windows 
> path) and executing:
> 
> copydep my.exe mingw64
> 
> This, of course, must be done before actually trying to execute the .exe in 
> the windows cmd prompt.
> 
> Hopefully, I should now be able to follow Pierre’s instructions for PETSc 
> (but first I wanna give a try to the system python before removing it)
> 
> Looks like the hard part is over. It’s usually easier to deal with 
> ./configure issues.
> If you have weird errors like “incomplete Cygwin install” or whatever, this 
> is the kind of issues I was referring to earlier.
> In that case, what I’d suggest is just, as before:
> pacman -R mingw-w64-x86_64-python mingw-w64-x86_64-gdb
> pacman -S python
> 
> Thanks,
> Pierre
> 
> Thanks
> 
> Paolo
> 
> 
> 
> 
> --
> 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/>
> 
> 
> <configure.log>
> 
> 
> <petsc_test.txt>
> 
> 

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