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Using PETSc with OOFEM

Use command line -ksp_type to choose the PETSc solver kind.
- Options are: richardson, chebychev, cg, gmres, tcqmr, bcgs, cgs, tfqmr, cr, lsqr, bicg, or preonly.
Use -ksp_gmres_restart with gmres and -ksp_richardson_scale for richardson.
Use command line -pc_type to choose the PETSc preconditioner.
- Options are: jacobi, bjacobi, sor, eisenstat, icc, ilu, asm, ksp, lu, or cholesky
- Loads of options exist for using these preconditioners as well. See most recent PETSc manual.
- Loads of externally supplied solvers as well that need to be hooked in.
Use command line -log_summary to get lots of PETSc information about your run.
Use -ksp_rtol, -ksp_atol, -ksp_divtol, and -ksp_max_it for setting other options.
Monitor convergence with -ksp_monitor and see info about preconditioners etc. with -ksp_view.