[petsc-users] The question of the output from ksp/ex2.c

[Tsung-Hsing Chen]

Unfortunately, it still no work for me.
what I do is
first : ./configure --with-cc=gcc --with-cxx=g++ --with-fc=gfortran
--download-mpich --download-fblaslapack
then make ......, and make check.
the output has shown that "C/C++ example src/snes/examples/tutorials/ex19
run successfully with 2 MPI processes".
last, I type "make -f gmakefile print VAR=MPIEXEC".

And I went running ex2, the problem still exists.
Is there needed to do anything else before I run ex2?
By the way, should I move to petsc-maint at mcs.anl.gov for the upcoming
question?


Stefano Zampini <stefano.zampini at gmail.com> 於 2020年2月26日 週三 下午4:50寫道：

> First, make sure you compiled with support for MPI by running make check
>
> [szampini at localhost petsc]$ make check
> Running test examples to verify correct installation
> Using PETSC_DIR=/home/szampini/Devel/jointinversion/pkgs/petsc and
> PETSC_ARCH=arch-joint
> C/C++ example src/snes/examples/tutorials/ex19 run successfully with 1 MPI
> process
> C/C++ example src/snes/examples/tutorials/ex19 run successfully with 2 MPI
> processes
> C/C++ example src/snes/examples/tutorials/ex19 run successfully with hypre
> C/C++ example src/snes/examples/tutorials/ex19 run successfully with mumps
> Completed test examples
>
> if you have the "2 MPI processes" output, then type
>
> [szampini at localhost petsc]$ make -f gmakefile print VAR=MPIEXEC
> mpiexec
>
> For me, mpiexec is system-wide.
>
> Il giorno mer 26 feb 2020 alle ore 11:38 Tsung-Hsing Chen <
> barrydog505 at gmail.com> ha scritto:
>
>> So, What should I do to use the correct mpiexec?
>> Am I configure petsc with the wrong way or something should be done?
>>
>> Stefano Zampini <stefano.zampini at gmail.com> 於 2020年2月26日 週三 下午4:26寫道：
>>
>>> This is what I get
>>>
>>> [szampini at localhost tutorials]$ mpiexec -n 2 ./ex2 -ksp_monitor_short
>>> -m 5 -n 5 -ksp_gmres_cgs_refinement_type refine_always
>>>   0 KSP Residual norm 2.73499
>>>   1 KSP Residual norm 0.795482
>>>   2 KSP Residual norm 0.261984
>>>   3 KSP Residual norm 0.0752998
>>>   4 KSP Residual norm 0.0230031
>>>   5 KSP Residual norm 0.00521255
>>>   6 KSP Residual norm 0.00145783
>>>   7 KSP Residual norm 0.000277319
>>> Norm of error 0.000292349 iterations 7
>>>
>>> When I sequentially, I get (same output as yours)
>>>
>>> [szampini at localhost tutorials]$ mpiexec -n 1 ./ex2 -ksp_monitor_short
>>> -m 5 -n 5 -ksp_gmres_cgs_refinement_type refine_always
>>>   0 KSP Residual norm 3.21109
>>>   1 KSP Residual norm 0.93268
>>>   2 KSP Residual norm 0.103515
>>>   3 KSP Residual norm 0.00787798
>>>   4 KSP Residual norm 0.000387275
>>> Norm of error 0.000392701 iterations 4
>>>
>>> This means you are using the wrong mpiexec
>>>
>>> Il giorno mer 26 feb 2020 alle ore 11:17 Tsung-Hsing Chen <
>>> barrydog505 at gmail.com> ha scritto:
>>>
>>>> Hi,
>>>>
>>>> I tried to run the example in ksp/examples/tutorials/ex2.
>>>> I run the code with : mpiexec -n 2 ./ex2 -ksp_monitor_short -m 5 -n 5
>>>> -ksp_gmres_cgs_refinement_type refine_always
>>>>
>>>> the output is :
>>>>   0 KSP Residual norm 3.21109
>>>>   1 KSP Residual norm 0.93268
>>>>   2 KSP Residual norm 0.103515
>>>>   3 KSP Residual norm 0.00787798
>>>>   4 KSP Residual norm 0.000387275
>>>> Norm of error 0.000392701 iterations 4
>>>>   0 KSP Residual norm 3.21109
>>>>   1 KSP Residual norm 0.93268
>>>>   2 KSP Residual norm 0.103515
>>>>   3 KSP Residual norm 0.00787798
>>>>   4 KSP Residual norm 0.000387275
>>>> Norm of error 0.000392701 iterations 4
>>>>
>>>> My output(above) is twice as
>>>> the ksp/examples/tutorials/output/ex2_4.out.
>>>> Is this the right answer that should come out?
>>>>
>>>> Thanks in advance,
>>>>
>>>> Tsung-Hsing Chen
>>>>
>>>
>>>
>>> --
>>> Stefano
>>>
>>
>
> --
> Stefano
>
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