Rolf Kuiper <[email protected]> writes: > I need this to e.g. solve a linear system of equations several times > (as the physical system proceeds in time); during a single call / > timestep, the system, might not change stronger than the RTOL in use, > but in the long-run (several hundreds to thousands of calls), the > system will actually change by several RTOL; nonetheless, the default > KSP solver stops without doing any iteration (= 0), i.e. the system > does not change at all.
When you use -ksp_converged_reason, is it completing due to RTOL or ATOL? For transient problems, it's often good to set an absolute tolerance.
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