I would guess that you specified a relative tolerance of 10^-8, which is satisfied below.
Matt On 11/19/06, billy at dem.uminho.pt <billy at dem.uminho.pt> wrote: > > I have specified maximum number of iterations 500 and tolerance 1E-8. Usually > it > drives the residual to specified tolerance but in this case GMRES seems to > stop > after 15 iterations and the residual is still above tolerance. > > 0 KSP Residual norm 2.928143483788e+05 > 1 KSP Residual norm 1.403875955158e+05 > 2 KSP Residual norm 4.068852804332e+04 > 3 KSP Residual norm 8.517044011269e+03 > 4 KSP Residual norm 2.179034005404e+03 > 5 KSP Residual norm 6.155723927227e+02 > 6 KSP Residual norm 1.636241232571e+02 > 7 KSP Residual norm 4.839052750735e+01 > 8 KSP Residual norm 1.118719384434e+01 > 9 KSP Residual norm 3.313977141518e+00 > 10 KSP Residual norm 7.447603108045e-01 > 11 KSP Residual norm 1.942386237492e-01 > 12 KSP Residual norm 4.843647894709e-02 > 13 KSP Residual norm 1.215264193249e-02 > 14 KSP Residual norm 3.111716140560e-03 > 15 KSP Residual norm 7.922640853896e-04 > > Matrix p Number of iterations: 15 Residual: +7.922641E-04 > > Anyone knows why this happens? > > Billy. > > -- "Failure has a thousand explanations. Success doesn't need one" -- Sir Alec Guiness
