PETSc automatically handles many of the details in parallel PDE solvers. How can I understand what is really happening within my program?
You can use the option -info to get more details about the solution process. The option -log_summary provides details about the distribution of time spent in the various phases of the solution process. You can run with -ts_view or -snes_view or -ksp_view to see what solver options are being used. Run with -ts_monitor -snes_monitor or -ksp_monitor to watch convergence of the methods. -snes_converged_reason and -ksp_converged_reason will indicate why and if the solvers have converged.
You can use the option -info to get more details about the solution process. The option -log_summary provides details about the distribution of time spent in the various phases of the solution process. You can use ${PETSC_DIR}/bin/petscview, which is a Tk/Tcl utility that provides high-level visualization of the computations within a PETSc program. This tool illustrates the changing relationships among objects during program execution in the form of a dynamic icon tree.
