[petsc-users] SLEPc Eigenvalue problem - Zero Pivot

Sat May 16 01:02:52 CDT 2015

Hi, I managed to plot it in matlab with the PetscBinaryRead with options:
vc=PetscBinaryRead('outvec','complex',true);

I missed the option 'complex' previously.

It is working fine now. I will ask another separate query so that this can
be closed.

Venkatesh

On Sat, May 16, 2015 at 1:16 AM, venkatesh g <venkateshgk.j at gmail.com>
wrote:

> 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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