[petsc-users] Question about TSComputeRHSJacobianConstant

Sajid Ali sajidsyed2021 at u.northwestern.edu
Wed May 22 14:45:56 CDT 2019

Hi Matt,

Thanks for the explanation. That makes sense since I'd get reasonably close
convergence with preonly sometimes and not at other times which was

Anyway, since there's no pc_tol (analogous to ksp_rtol/ksp_atol, etc), I'd
have to more carefully set the gamg preconditioner options to ensure that
it converges in one run, but since there's no guarantee that what works for
one problem might not work for another (or the same problem at a different
grid size), I'll stick with GMRES+gamg for now.

Thank You,
Sajid Ali
Applied Physics
Northwestern University
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