[petsc-users] Expecting Explanation

[Matthew Knepley]

On Sat, Nov 17, 2018 at 10:37 PM Fazlul Huq via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> I tried to reconfigure PETSc and I got the following error message:
>

Do not reconfigure, just use the mpiexec in $PETSC_DIR/$PETSC_ARCH/bin as
Barry suggested.

   Matt


>
> ..................................................................................................................
> Unable to find mpi in default locations!
> Perhaps you can specify with --with-mpi-dir=<directory>
> If you do not want MPI, then give --with-mpi=0
> You might also consider using --download-mpich instead
>
> .................................................................................................................
> I also got this error message last time when I have installed first and I
> have used --download-mpich command.
>
> The log file is attached herewith along with terminal screenshot.
> I am not sure what to do now.
>
> Thanks.
> Sincerely,
> Huq
>
>
> On Sat, Nov 17, 2018 at 5:26 PM Smith, Barry F. <bsmith at mcs.anl.gov>
> wrote:
>
>>
>>    Then use
>>
>>      ${PETSC_DIR}/${PETSC_ARCH}/bin/mpiexec
>>
>>   don't just use the random (wrong) mpiexec that is in your path.
>>
>>    Barry
>>
>>
>> > On Nov 17, 2018, at 5:22 PM, Fazlul Huq <huq2090 at gmail.com> wrote:
>> >
>> > I think when I have installed PETSc, I did --download-mpich.
>> > How can I correct it? Shall I install PETSc again?
>> >
>> > Thanks.
>> > Sincerely,
>> > Huq
>> >
>> > On Sat, Nov 17, 2018 at 4:53 PM Smith, Barry F. <bsmith at mcs.anl.gov>
>> wrote:
>> >
>> >
>> > > On Nov 17, 2018, at 3:51 PM, Fazlul Huq via petsc-users <
>> petsc-users at mcs.anl.gov> wrote:
>> > >
>> > > Thanks for the answer.
>> > >
>> > > So, when I run the code with "mpiexec -n 2 ./ex6" or "mpiexec -n 4
>> ./ex6" shouldn't it spit out
>> > > the error "This is a uniprocessor example only!"?
>> > > But it didn't do that rather run the code 2/4 times.
>> >
>> >    This can happen if you use the "wrong" mpiexec; that is a different
>> mpiexec than the one associated with the mpi you built PETSc with. For
>> example if some mpiexec is in your path and you used ./configure
>> --download-mpich
>> >
>> >    Barry
>> >
>> >
>> > >
>> > > Thanks.
>> > > Sincerely,
>> > > Huq
>> > >
>> > > On Sat, Nov 17, 2018 at 1:12 PM Fazlul Huq <huq2090 at gmail.com> wrote:
>> > > Hello PETSc developers,
>> > >
>> > > In example 6 or vec section I don't understand this line:
>> > > if (size != 1) SETERRQ(PETSC_COMM_SELF,1,"This is a uniprocessor
>> example only!");
>> > >
>> > > I tried to run the code with "mpiexec -n 2 ./ex6" or "mpiexec -n 4
>> ./ex6" or even "mpiexec -n 1 ./ex6" it the code runs properly.
>> > >
>> > > Thanks.
>> > >
>> > > Sincerely,
>> > > Huq
>> > >
>> > > --
>> > >
>> > > Fazlul Huq
>> > > Graduate Research Assistant
>> > > Department of Nuclear, Plasma & Radiological Engineering (NPRE)
>> > > University of Illinois at Urbana-Champaign (UIUC)
>> > > E-mail: huq2090 at gmail.com
>> > >
>> > >
>> > > --
>> > >
>> > > Fazlul Huq
>> > > Graduate Research Assistant
>> > > Department of Nuclear, Plasma & Radiological Engineering (NPRE)
>> > > University of Illinois at Urbana-Champaign (UIUC)
>> > > E-mail: huq2090 at gmail.com
>> >
>> >
>> >
>> > --
>> >
>> > Fazlul Huq
>> > Graduate Research Assistant
>> > Department of Nuclear, Plasma & Radiological Engineering (NPRE)
>> > University of Illinois at Urbana-Champaign (UIUC)
>> > E-mail: huq2090 at gmail.com
>>
>>
>
> --
>
> Fazlul Huq
> Graduate Research Assistant
> Department of Nuclear, Plasma & Radiological Engineering (NPRE)
> University of Illinois at Urbana-Champaign (UIUC)
> E-mail: huq2090 at gmail.com
>


-- 
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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