[petsc-users] pc_redistribute issue

[Mark Adams]

KSP Object: (redistribute_) 1 MPI process
  type: gmres
    restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization
with no iterative refinement
    happy breakdown tolerance 1e-30
  maximum iterations=10000, initial guess is zero

*  tolerances:  relative=1e-12, absolute=1e-50, divergence=10000.*  left
preconditioning
  using PRECONDITIONED norm type for convergence test
PC Object: (redistribute_) 1 MPI process
  type: bjacobi
    number of blocks = 1
    Local solver information for first block is in the following KSP and PC
objects on rank 0:
    Use -redistribute_ksp_view ::ascii_info_detail to display information
for all blocks
    KSP Object: (redistribute_sub_) 1 MPI process
      type: preonly
      maximum iterations=10000, initial guess is zero
      tolerances:  relative=1e-05, absolute=1e-50, divergence=10000.
      left preconditioning
      using NONE norm type for convergence test
    PC Object: (redistribute_sub_) 1 MPI process
      type: lu
        out-of-place factorization
        tolerance for zero pivot 2.22045e-14

On Sat, Jan 27, 2024 at 10:24 AM Matthew Knepley <knepley at gmail.com> wrote:

> View the solver.
>
>   Matt
>
> On Sat, Jan 27, 2024 at 9:43 AM Mark Adams <mfadams at lbl.gov> wrote:
>
>> I am not getting ksp_rtol 1e-12 into pc_redistribute correctly?
>>
>>
>>
>> * Linear redistribute_ solve converged due to CONVERGED_RTOL iterations
>> 1  0 KSP Residual norm 2.182384017537e+02   1 KSP Residual norm
>> 1.889764161573e-04 *
>> Number of iterations =   1 N = 47628
>> Residual norm 8.65917e-07
>> #PETSc Option Table entries:
>> -f S.bin # (source: command line)
>> -ksp_monitor # (source: command line)
>> -ksp_type preonly # (source: command line)
>> -mat_block_size 36 # (source: command line)
>> -mat_view ascii::ascii_info # (source: command line)
>> -options_left # (source: command line)
>> -pc_type redistribute # (source: command line)
>> -redistribute_ksp_converged_reason # (source: command line)
>>
>> *-redistribute_ksp_rtol 1e-12 # (source: command line)*-redistribute_ksp_type
>> gmres # (source: command line)
>> -redistribute_pc_type bjacobi # (source: command line)
>> -redistribute_sub_pc_factor_mat_solver_type mumps # (source: command line)
>> -redistribute_sub_pc_type lu # (source: command line)
>> #End of PETSc Option Table entries
>> *There are no unused options.*
>>
>
>
> --
> 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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