Hi,
I am having issues with using PETSC iterative solvers. I follow the steps
in Step40 exactly, and I get: PETSc preconditioner should have an
associated matrix set to be used in solver.
I do set the preconditioner correctly, exactly as shown in Step40. I am
able to reproduce this error by running step-40 too (shown below). I am
using deal.II version 9.0.1, and petsc version 3.10.3 . My question is
Step-40 expected to show this error, if not, any pointers on what is
causing this error?.
Thanks,
Pandey
[ 66%] Built target step-40
[100%] Run step-40 with Release configuration
Running with PETSc on 1 MPI rank(s)...
Cycle 0:
Number of active cells: 1024
Number of degrees of freedom: 4225
---------------------------------------------------------
TimerOutput objects finalize timed values printed to the
screen by communicating over MPI in their destructors.
Since an exception is currently uncaught, this
synchronization (and subsequent output) will be skipped to
avoid a possible deadlock.
---------------------------------------------------------
ERROR: Uncaught exception in MPI_InitFinalize on proc 0. Skipping
MPI_Finalize() to avoid a deadlock.
----------------------------------------------------
Exception on processing:
--------------------------------------------------------
An error occurred in line <88> of file
</scratch/software/dealii/dealii-9.0.1/source/lac/petsc_solver.cc> in
function
void dealii::PETScWrappers::SolverBase::solve(const
dealii::PETScWrappers::MatrixBase&, dealii::PETScWrappers::VectorBase&,
const dealii::PETScWrappers::VectorBase&, const
dealii::PETScWrappers::PreconditionerBase&)
The violated condition was:
B != nullptr
Additional information:
*PETSc preconditioner should have anassociated matrix set to be used in
solver.*
--------------------------------------------------------
Aborting!
----------------------------------------------------
CMakeFiles/run.dir/build.make:57: recipe for target 'CMakeFiles/run' failed
make[3]: *** [CMakeFiles/run] Error 1
CMakeFiles/Makefile2:131: recipe for target 'CMakeFiles/run.dir/all' failed
make[2]: *** [CMakeFiles/run.dir/all] Error 2
CMakeFiles/Makefile2:138: recipe for target 'CMakeFiles/run.dir/rule' failed
make[1]: *** [CMakeFiles/run.dir/rule] Error 2
Makefile:144: recipe for target 'run' failed
make: *** [run] Error 2
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