On Wed, Dec 14, 2011 at 2:07 PM, Mark F. Adams <mark.adams at columbia.edu>wrote:
> > > Mark > > On Dec 14, 2011, at 1:57 PM, Matthew Knepley wrote: > > On Wed, Dec 14, 2011 at 12:45 PM, Mark F. Adams <mark.adams at > columbia.edu>wrote: > >> I have a nonlinear problem and am finding the the convergence test for >> the interior PETSc linear solver is apparently testing against the norm of >> the first linear solve (see appended). This is clearly not what anyone >> would want, is this the intended semantics? Is there perhaps a method to >> reset rtol? > > This is the same discussion about what to use a ||r_0||. You might want http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPDefaultConvergedSetUIRNorm.html#KSPDefaultConvergedSetUIRNorm Matt > -snes_view -ksp_view? > > Matt > > >> Mark >> >> Picard iteration 0 max(resid) = 781020 >> 0 KSP Residual norm 2.499264167662e+07 >> 1 KSP Residual norm 6.330915810095e+06 >> 2 KSP Residual norm 1.856999435466e+06 >> 3 KSP Residual norm 3.967325725053e+05 >> 4 KSP Residual norm 9.037332775808e+04 >> 5 KSP Residual norm 1.826960320400e+04 >> Linear solve converged due to CONVERGED_RTOL iterations 5 >> Picard iteration 1 max(resid) = 727577 ------- Rate = 1.07345 >> 0 KSP Residual norm 6.885328126772e+06 >> 1 KSP Residual norm 2.150319244570e+06 >> 2 KSP Residual norm 2.297759417371e+05 >> 3 KSP Residual norm 3.321819214451e+04 >> 4 KSP Residual norm 4.155970071625e+03 >> Linear solve converged due to CONVERGED_RTOL iterations 4 >> Picard iteration 2 max(resid) = 486788 ------- Rate = 1.49465 >> 0 KSP Residual norm 2.987417661953e+06 >> 1 KSP Residual norm 5.046119985008e+05 >> 2 KSP Residual norm 3.882757664605e+04 >> 3 KSP Residual norm 4.106091678345e+03 >> Linear solve converged due to CONVERGED_RTOL iterations 3 >> Picard iteration 3 max(resid) = 137348 ------- Rate = 3.54418 >> 0 KSP Residual norm 7.285359985607e+05 >> 1 KSP Residual norm 9.132700545850e+04 >> 2 KSP Residual norm 6.834608381922e+03 >> Linear solve converged due to CONVERGED_RTOL iterations 2 >> Picard iteration 4 max(resid) = 25082.7 ------- Rate = 5.47582 >> 0 KSP Residual norm 1.207523847817e+05 >> 1 KSP Residual norm 1.286174706329e+04 >> Linear solve converged due to CONVERGED_RTOL iterations 1 >> Picard iteration 5 max(resid) = 5723.21 ------- Rate = 4.38264 >> 0 KSP Residual norm 2.211945822133e+04 >> Linear solve converged due to CONVERGED_RTOL iterations 0 >> >> > > > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener > > > > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20111214/01e28ee0/attachment.html>