Hi freinds,
I have parallelized a code for a Thermoelastic problem based on step-40 .
Although the non-parallel code works for all the initial values and
boundary conditions, the parallel one fails giving this error :
"PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation,
probably memory access out of range"
It seems from debugger backtracethat that error comes from the
PETScWrappers::SolverCG.
Surprisingly, the problem converges for few initial value or boundary
conditions (not for all problem conditions) when I change the
preconditioner from PreconditionAMG to PreconditionJacobi.
It would be appreciated if you could give me any clue why I have this
error. The following is my solve object:
template <int dim>
unsigned int
Solid<dim>::solve ()
{
LA::MPI::Vector
completely_distributed_solution (locally_owned_dofs,
mpi_communicator);
SolverControl solver_control (dof_handler.n_dofs(), 1e-12);
#ifdef USE_PETSC_LA
LA::SolverCG solver(solver_control, mpi_communicator);
#else
LA::SolverCG solver(solver_control);
#endif
LA::MPI::PreconditionAMG preconditioner;
LA::MPI::PreconditionAMG::AdditionalData data;
#ifdef USE_PETSC_LA
data.symmetric_operator = true;
//data.strong_threshold = 0.5;
#else
/* Trilinos defaults are good */
#endif
preconditioner.initialize(tangent_matrix, data);
// LA::MPI::PreconditionJacobi preconditioner(tangent_matrix);
solver.solve (tangent_matrix, completely_distributed_solution,
system_rhs,
preconditioner);
constraints.distribute (completely_distributed_solution);
solution_update = completely_distributed_solution;
return solver_control.last_step();
}
Thanks,
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