| -ksp_max_it | - maximum number of linear iterations
|
| -ksp_rtol rtol | - relative tolerance used in default determination of convergence, i.e.
if residual norm decreases by this factor than convergence is declared
|
| -ksp_atol abstol | - absolute tolerance used in default convergence test, i.e. if residual
norm is less than this then convergence is declared
|
| -ksp_divtol tol | - if residual norm increases by this factor than divergence is declared
|
| -ksp_converged_use_initial_residual_norm | - see KSPConvergedDefaultSetUIRNorm()
|
| -ksp_converged_use_min_initial_residual_norm | - see KSPConvergedDefaultSetUMIRNorm()
|
| -ksp_converged_maxits | - see KSPConvergedDefaultSetConvergedMaxits()
|
| -ksp_norm_type | - none - skip norms used in convergence tests (useful only when not using
convergence test (say you always want to run with 5 iterations) to
save on communication overhead
preconditioned - default for left preconditioning
unpreconditioned - see KSPSetNormType()
natural - see KSPSetNormType()
|
| -ksp_check_norm_iteration it | - do not compute residual norm until iteration number it (does compute at 0th iteration)
works only for PCBCGS, PCIBCGS and and PCCG
|
| -ksp_lag_norm | - compute the norm of the residual for the ith iteration on the i+1 iteration; this means that one can use
the norm of the residual for convergence test WITHOUT an extra MPI_Allreduce() limiting global synchronizations.
This will require 1 more iteration of the solver than usual.
|
| -ksp_guess_type | - Type of initial guess generator for repeated linear solves
|
| -ksp_fischer_guess <model,size> | - uses the Fischer initial guess generator for repeated linear solves
|
| -ksp_constant_null_space | - assume the operator (matrix) has the constant vector in its null space
|
| -ksp_test_null_space | - tests the null space set with MatSetNullSpace() to see if it truly is a null space
|
| -ksp_knoll | - compute initial guess by applying the preconditioner to the right hand side
|
| -ksp_monitor_cancel | - cancel all previous convergene monitor routines set
|
| -ksp_monitor <optional filename> | - print residual norm at each iteration
|
| -all_ksp_monitor <optional filename> | - print residual norm at each iteration for ALL KSP solves, regardless of their prefix. This is
useful for PCFIELDSPLIT, PCMG, etc that have inner solvers and you wish to track the convergence of all the solvers
|
| -ksp_monitor_lg_residualnorm | - plot residual norm at each iteration
|
| -ksp_monitor_solution [ascii binary or draw][:filename][:format option] | - plot solution at each iteration
|
| -ksp_monitor_singular_value | - monitor extreme singular values at each iteration
|