[petsc-users] Multiple solves with PCMG fail

[Filippo Leonardi]

@ Jed

Can't figure out what solver is causing the problem actually, I tried 
evrerything: mg_levels, mg_coarse and nothing.

On Tuesday 04 November 2014 12.21:29 Mark Adams wrote:
> On Tue, Nov 4, 2014 at 2:55 AM, Filippo Leonardi <
> 
> filippo.leonardi at sam.math.ethz.ch> wrote:
> > Sorry for the late update.
> > 
> > I tested the code with the branch:
> > ksp-zero-eig
> 
> Did you make PETSc after the checking out the branch?  

Yes.

> Please send us the
> error message and run in debug mode if possible.

See below.

> 
> > But the problem seems to still be there, also tried:
> > -ksp_chebyshev_estimate_eigenvalues_random
> > but does not change.
> > 
> > Just tell me what test you need and I'll try to do them.
> > 
> > Best,
> > Filippo
> > 
> > On Wednesday 29 October 2014 10.30:14 Mark Adams wrote:
> > > > Yeah, that should work; an alternative is to defer the estimate until
> > > > the next solve.
> > > 
> > > Sounds better.  As I said one of my users has a zero RHS on the first
> > 
> > solve.

( Despite ARCH being arch-linux2-cxx-opt  it's compiled in debug mode )

mpirun -np 4 ./test1 -mg_levels_ksp_chebyshev_estimate_eigenvalues_random -
ksp_chebyshev_estimate_eigenvalues_random -pc_type mg -pc_mg_levels 5 -
draw_pause -1 -ksp_view 

[0]PETSC ERROR: [1]PETSC ERROR: --------------------- Error Message 
--------------------------------------------------------------
[1]PETSC ERROR: Null argument, when expecting valid pointer                                                                                                                                                                                                                     
[1]PETSC ERROR: Null Pointer: Parameter # 3                                                                                                                                                                                                                                     
[1]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for 
trouble shooting.                                                                                                                                                                                   
[1]PETSC ERROR: Petsc Development GIT revision: v3.5.2-925-g233c798  GIT Date: 
2014-11-03 17:44:15 -0700                                                                                                                                                                        
[1]PETSC ERROR: ./test1 on a arch-linux2-cxx-opt named Besikovitch-III by 
filippo Wed Nov  5 08:32:52 2014                                                                                                                                                                      
[1]PETSC ERROR: Configure options                                                                                                                                                                                                                                               
[1]PETSC ERROR: #1 KSPComputeEigenvalues() line 119 in 
/home/filippo/Workspace/petsc-git/ksp-zero-eig/src/ksp/ksp/interface/itfunc.c                                                                                                                                            
[1]PETSC ERROR: #2 KSPChebyshevComputeExtremeEigenvalues_Private() line 328 in 
/home/filippo/Workspace/petsc-git/ksp-zero-eig/src/ksp/ksp/impls/cheby/cheby.c                                                                                                                   
[1]PETSC ERROR: #3 KSPSolve_Chebyshev() line 373 in 
/home/filippo/Workspace/petsc-git/ksp-zero-eig/src/ksp/ksp/impls/cheby/cheby.c                                                                                                                                              
[1]PETSC ERROR: #4 KSPSolve() line 460 in /home/filippo/Workspace/petsc-
git/ksp-zero-eig/src/ksp/ksp/interface/itfunc.c                                                                                                                                                         
[1]PETSC ERROR: #5 PCMGMCycle_Private() line 19 in 
/home/filippo/Workspace/petsc-git/ksp-zero-eig/src/ksp/pc/impls/mg/mg.c                                                                                                                                                      
[1]PETSC ERROR: #6 PCApply_MG() line 337 in /home/filippo/Workspace/petsc-
git/ksp-zero-eig/src/ksp/pc/impls/mg/mg.c     
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Filippo Leonardi.vcf
Type: text/vcard
Size: 322 bytes
Desc: not available
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20141105/b260e9eb/attachment-0001.bin>