[petsc-users] SLEPc Eigenvalue problem - Zero Pivot

[venkatesh g]

Hi, I am now running the solver with the mumps

/ex7 -f1 adt -f2 bdt -st_type sinvert -st_ksp_type preonly -st_pc_type lu
-st_pc_factor_mat_solver_package mumps -evecs outvec

However, my eigenvalue is not right by 0.5% and the eigenvector is not
correct when I plotted it.
It has to match the matlab result as it is a benchmark from a book.

Kindly advice.

Venkatesh



On Fri, May 15, 2015 at 8:24 PM, venkatesh g <venkateshgk.j at gmail.com>
wrote:

> Ah. I made mistake by looking at the old manual. I am now reading the
> latest version of the manual.
>
> I will do this and get back.
>
> Venkatesh
>
> On Fri, May 15, 2015 at 6:14 PM, Jose E. Roman <jroman at dsic.upv.es> wrote:
>
>> You have to choose MUMPS as the solver. ONCE AGAIN, read section 3.4.1 of
>> the users manual.
>> Jose
>>
>>
>> El 15/05/2015, a las 13:48, venkatesh g escribió:
>>
>> > Ok, I followed this process and compiled ex7 successfully.
>> >
>> > Now I give the command: './ex7 -f1 A11 -f2 B11 -eps_nev 4 -eps_target
>> 0.5 -st_type sinvert'
>> >
>> > The error is the zero pivot problem:
>> >
>> >  Reading COMPLEX matrices from binary files...
>> > [0]PETSC ERROR: --------------------- Error Message
>> ------------------------------------
>> > [0]PETSC ERROR: Detected zero pivot in LU factorization:
>> > see http://www.mcs.anl.gov/petsc/documentation/faq.html#ZeroPivot!
>> > [0]PETSC ERROR: Zero pivot row 420 value 0 tolerance 2.22045e-14!
>> > [0]PETSC ERROR:
>> ------------------------------------------------------------------------
>> > [0]PETSC ERROR: Petsc Release Version 3.3.0, Patch 7, Sat May 11
>> 22:15:24 CDT 2013
>> > [0]PETSC ERROR: See docs/changes/index.html for recent updates.
>> > [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
>> > [0]PETSC ERROR: See docs/index.html for manual pages.
>> > [0]PETSC ERROR:
>> ------------------------------------------------------------------------
>> > [0]PETSC ERROR: ./ex7 on a linux-gnu named earth.ceas.iisc.ernet.in by
>> venkatesh Fri May 15 17:07:02 2015
>> > [0]PETSC ERROR: Libraries linked from
>> /cluster/share/venkatesh/petsc-3.3-p7/linux-gnu-intel-cmplx-batch/lib
>> > [0]PETSC ERROR: Configure run at Fri May 15 15:10:57 2015
>> > [0]PETSC ERROR: Configure options --with-cc=gcc --with-fc=ifort
>> --with-blas-lapack-dir=/opt/intel/composer_xe_2013.5.192/mkl/lib/intel64
>> --download-mpich=/cluster/share/apps/mpich2-1.4.1p1.tar.gz
>> --download-mumps=/cluster/share/apps/MUMPS_4.10.0-p3.tar.gz
>> --download-scalapack=/cluster/share/apps/SCALAPACK-1.7.tar.gz
>> --download-blacs=/cluster/share/apps/blacs-dev.tar.gz
>> --download-parmetis=/cluster/share/apps/parmetis-4.0.2-p3.tar.gz
>> --download-metis=/cluster/share/apps/metis-5.0.2-p3.tar.gz
>> --download-cmake=/cluster/share/apps/cmake-2.8.7.tar.gz
>> --with-scalar-type=complex --with-fortran-kernels=generic
>> --with-large-file-io=1
>> > [0]PETSC ERROR:
>> ------------------------------------------------------------------------
>> > [0]PETSC ERROR: MatPivotCheck_none() line 583 in
>> /cluster/share/venkatesh/petsc-3.3-p7/include/petsc-private/matimpl.h
>> > [0]PETSC ERROR: MatPivotCheck() line 602 in
>> /cluster/share/venkatesh/petsc-3.3-p7/include/petsc-private/matimpl.h
>> > [0]PETSC ERROR: MatLUFactorNumeric_SeqAIJ() line 570 in
>> /cluster/share/venkatesh/petsc-3.3-p7/src/mat/impls/aij/seq/aijfact.c
>> > [0]PETSC ERROR: MatLUFactorNumeric() line 2803 in
>> /cluster/share/venkatesh/petsc-3.3-p7/src/mat/interface/matrix.c
>> > [0]PETSC ERROR: PCSetUp_LU() line 160 in
>> /cluster/share/venkatesh/petsc-3.3-p7/src/ksp/pc/impls/factor/lu/lu.c
>> > [0]PETSC ERROR: PCSetUp() line 832 in
>> /cluster/share/venkatesh/petsc-3.3-p7/src/ksp/pc/interface/precon.c
>> > [0]PETSC ERROR: KSPSetUp() line 278 in
>> /cluster/share/venkatesh/petsc-3.3-p7/src/ksp/ksp/interface/itfunc.c
>> > [0]PETSC ERROR: PCSetUp_Redundant() line 176 in
>> /cluster/share/venkatesh/petsc-3.3-p7/src/ksp/pc/impls/redundant/redundant.c
>> > [0]PETSC ERROR: PCSetUp() line 832 in
>> /cluster/share/venkatesh/petsc-3.3-p7/src/ksp/pc/interface/precon.c
>> > [0]PETSC ERROR: KSPSetUp() line 278 in
>> /cluster/share/venkatesh/petsc-3.3-p7/src/ksp/ksp/interface/itfunc.c
>> > [0]PETSC ERROR: STSetUp_Sinvert() line 153 in
>> /cluster/share/venkatesh/petsc-3.3-p7/slepc-3.3-p4/src/st/impls/sinvert/sinvert.c
>> > [0]PETSC ERROR: STSetUp() line 280 in
>> /cluster/share/venkatesh/petsc-3.3-p7/slepc-3.3-p4/src/st/interface/stsolve.c
>> > [0]PETSC ERROR: EPSSetUp() line 204 in
>> /cluster/share/venkatesh/petsc-3.3-p7/slepc-3.3-p4/src/eps/interface/setup.c
>> > [0]PETSC ERROR: EPSSolve() line 109 in
>> /cluster/share/venkatesh/petsc-3.3-p7/slepc-3.3-p4/src/eps/interface/solve.c
>> > [0]PETSC ERROR: main() line 148 in ex7.c
>> > application called MPI_Abort(MPI_COMM_WORLD, 71) - process 0
>> > [unset]: aborting job:
>> > application called MPI_Abort(MPI_COMM_WORLD, 71) - process 0
>> >
>> > Venkatesh
>> >
>> > On Fri, May 15, 2015 at 4:22 PM, Jose E. Roman <jroman at dsic.upv.es>
>> wrote:
>> >
>> > El 15/05/2015, a las 12:49, venkatesh g escribió:
>> >
>> > > Hi,
>> > > 'make test' was successful on the $PETSC_DIR.
>> > > I configured MUMPS, metis, parmetis, scalapack through
>> '--download-mumps=/path/MUMPS_4.10.0-p3.tar.gz' and etc..
>> > >
>> > > I will anyway download the new version and start installing it now.,
>> Is it due to some flag issue ? I have attached my makefile.
>> > >
>> > > Venkatesh
>> > >
>> >
>> > You must link with all libraries, otherwise you will get undefined
>> symbols. The easiest way is to include PETSc and SLEPc makefile
>> definitions. See for instance section 1.4.2 of SLEPc's users manual.
>> >
>> > Jose
>> >
>> >
>>
>>
>
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