Barry Smith wrote: > 9 KSP Residual norm 3.942287795560e-03 > 10 KSP Residual norm 4.611215310185e+00 > ^^^^^^^^^^^^^^^^^^^^^^ > > This should never happen. This means there is an error > in your preconditioner, your smoother is not a linear operator > on its input variables. With GMRES, at restart the residual > norm should hardly change at all. The fact that it shoots > up means that the norm indicated in iteration 9 is totally wrong. > > If you run the gmres version with -ksp_monitor_true_residual > you will see that the true residual is not actually decreasing > like you think it is. >
Thank You for answer, result for which you asking are in my previous email - look at end of the previous email. If You look there at true residual, You will see that results are ok. Regards, Lukasz 2) -ksp_type fgmres -ksp_gmres_restart 100 -ksp_monitor_true_residual 0 KSP preconditioned resid norm 8.770931682456e+05 true resid norm 8.770931682456e+05 ||Ae||/||Ax|| 2.025559907164e+06 1 KSP preconditioned resid norm 1.466659768959e+00 true resid norm 1.466659768959e+00 ||Ae||/||Ax|| 3.387105649673e+00 2 KSP preconditioned resid norm 2.135783619677e-01 true resid norm 2.135783619678e-01 ||Ae||/||Ax|| 4.932380991006e-01 3 KSP preconditioned resid norm 1.342354228152e-01 true resid norm 1.342354228151e-01 ||Ae||/||Ax|| 3.100034299884e-01 4 KSP preconditioned resid norm 7.872906297489e-02 true resid norm 7.872906297491e-02 ||Ae||/||Ax|| 1.818169828064e-01 5 KSP preconditioned resid norm 3.414496482864e-02 true resid norm 3.414496482865e-02 ||Ae||/||Ax|| 7.885441854116e-02 6 KSP preconditioned resid norm 2.025183908090e-02 true resid norm 2.025183908092e-02 ||Ae||/||Ax|| 4.676961897981e-02 7 KSP preconditioned resid norm 1.023707179274e-02 true resid norm 1.023707179279e-02 ||Ae||/||Ax|| 2.364150462111e-02 8 KSP preconditioned resid norm 4.938281368004e-03 true resid norm 4.938281368031e-03 ||Ae||/||Ax|| 1.140447230867e-02 9 KSP preconditioned resid norm 2.373276511281e-03 true resid norm 2.373276511245e-03 ||Ae||/||Ax|| 5.480847330515e-03 10 KSP preconditioned resid norm 1.180493643594e-03 true resid norm 1.180493643635e-03 ||Ae||/||Ax|| 2.726233291716e-03 11 KSP preconditioned resid norm 7.142592937639e-04 true resid norm 7.142592936809e-04 ||Ae||/||Ax|| 1.649511181911e-03 12 KSP preconditioned resid norm 4.226036746778e-04 true resid norm 3) -ksp_type fgmres -ksp_gmres_restart 10 -ksp_monitor_true_residual 0 KSP preconditioned resid norm 8.770931682456e+05 true resid norm 8.770931682456e+05 ||Ae||/||Ax|| 2.025559907164e+06 1 KSP preconditioned resid norm 1.466659768959e+00 true resid norm 1.466659768959e+00 ||Ae||/||Ax|| 3.387105649673e+00 2 KSP preconditioned resid norm 2.135783619677e-01 true resid norm 2.135783619678e-01 ||Ae||/||Ax|| 4.932380991006e-01 3 KSP preconditioned resid norm 1.342354228152e-01 true resid norm 1.342354228151e-01 ||Ae||/||Ax|| 3.100034299884e-01 4 KSP preconditioned resid norm 7.872906297489e-02 true resid norm 7.872906297491e-02 ||Ae||/||Ax|| 1.818169828064e-01 5 KSP preconditioned resid norm 3.414496482864e-02 true resid norm 3.414496482865e-02 ||Ae||/||Ax|| 7.885441854116e-02 6 KSP preconditioned resid norm 2.025183908090e-02 true resid norm 2.025183908092e-02 ||Ae||/||Ax|| 4.676961897981e-02 7 KSP preconditioned resid norm 1.023707179274e-02 true resid norm 1.023707179279e-02 ||Ae||/||Ax|| 2.364150462111e-02 8 KSP preconditioned resid norm 4.938281368004e-03 true resid norm 4.938281368031e-03 ||Ae||/||Ax|| 1.140447230867e-02 9 KSP preconditioned resid norm 2.373276511281e-03 true resid norm 2.373276511245e-03 ||Ae||/||Ax|| 5.480847330515e-03 10 KSP preconditioned resid norm 1.180493643635e-03 true resid norm 1.180493643635e-03 ||Ae||/||Ax|| 2.726233291716e-03 11 KSP preconditioned resid norm 8.973593571160e-04 true resid norm 8.973593570913e-04 ||Ae||/||Ax|| 2.072362665506e-03 12 KSP preconditioned resid norm 8.954054180580e-04 true resid norm
