On Fri, Jul 8, 2011 at 17:17, TAY wee-beng <zonexo at gmail.com> wrote:
> ** > Hi Jed, > > This is my output when the error happens for gmres: > > 2 KSP preconditioned resid norm 1.556688898463e+007 true resid norm > 2.58995443 > 8801e+003 ||Ae||/||Ax|| 1.232088736212e+003 > 2 KSP preconditioned resid norm 1.556688898463e+007 true resid norm > 2.58995443 > 8801e+003 ||Ae||/||Ax|| 1.232088736212e+003 > 3 KSP preconditioned resid norm 1.207952812560e+003 true resid norm > 9.05939430 > 1179e+003 ||Ae||/||Ax|| 4.309719703237e+003 > 3 KSP preconditioned resid norm 1.207952812560e+003 true resid norm > 9.05939430 > 1179e+003 ||Ae||/||Ax|| 4.309719703237e+003 3 KSP preconditioned resid norm > 1.207952812560e+003 true resid norm 9.05939430 > 1179e+003 ||Ae||/||Ax|| 4.309719703237e+003 > 3 KSP preconditioned resid norm 1.207952812560e+003 true resid norm > 9.05939430 > 1179e+003 ||Ae||/||Ax|| 4.309719703237e+003 > 3 KSP preconditioned resid norm 1.207952812560e+003 true resid norm > 9.05939430 > 1179e+003 ||Ae||/||Ax|| 4.309719703237e+003 > 4 KSP preconditioned resid norm 3.815055004710e+001 true resid norm > 1.96385966 > 1729e+002 ||Ae||/||Ax|| 9.342439899591e+001 > 4 KSP preconditioned resid norm 3.815055004710e+001 true resid norm > 1.96385966 > 1729e+002 ||Ae||/||Ax|| 9.342439899591e+001 > 4 KSP preconditioned resid norm 3.815055004710e+001 true resid norm > 1.96385966 > 1729e+002 ||Ae||/||Ax|| 9.342439899591e+001 > 4 KSP preconditioned resid norm 3.815055004710e+001 true resid norm > 1.96385966 > 1729e+002 ||Ae||/||Ax|| 9.342439899591e+001 > 4 KSP preconditioned resid norm 3.815055004710e+001 true resid norm > 1.96385966 > 1729e+002 ||Ae||/||Ax|| 9.342439899591e+001 > Why is the same line output multiple times? Do you have an MPI problem? This convergence looks funky; I suspect your preconditioner is singular and/or nonlinear. Please send -ksp_view output as you are running here and with -pc_type asm -sub_pc_type lu. > > for fgmres: > > 34 KSP preconditioned resid norm 2.428114102327e-005 true resid norm > 3.35941610 > 6265e-005 ||Ae||/||Ax|| 1.598129588716e-005 > 34 KSP preconditioned resid norm 2.428114102327e-005 true resid norm > 3.35941610 > 6265e-005 ||Ae||/||Ax|| 1.598129588716e-005 > 35 KSP preconditioned resid norm 2.200715659545e-005 true resid norm > 3.88294769 > 5703e-005 ||Ae||/||Ax|| 1.847182191086e-005 > 35 KSP preconditioned resid norm 2.200715659545e-005 true resid norm > 3.88294769 > 5703e-005 ||Ae||/||Ax|| 1.847182191086e-005 > 35 KSP preconditioned resid norm 2.200715659545e-005 true resid norm > 3.88294769 > 5703e-005 ||Ae||/||Ax|| 1.847182191086e-005 > 35 KSP preconditioned resid norm 2.200715659545e-005 true resid norm > 3.88294769 > 5703e-005 ||Ae||/||Ax|| 1.847182191086e-005 > 35 KSP preconditioned resid norm 2.200715659545e-005 true resid norm > 3.88294769 > 5703e-005 ||Ae||/||Ax|| 1.847182191086e-005 > 36 KSP preconditioned resid norm 2.011575409369e-005 true resid norm > 3.89282805 > 6204e-005 ||Ae||/||Ax|| 1.851882441357e-005 > 36 KSP preconditioned resid norm 2.011575409369e-005 true resid norm > 3.89282805 > 6204e-005 ||Ae||/||Ax|| 1.851882441357e-005 > 36 KSP preconditioned resid norm 2.011575409369e-005 true resid norm > 3.89282805 > 6204e-005 ||Ae||/||Ax|| 1.851882441357e-005 > 36 KSP preconditioned resid norm 2.011575409369e-005 true resid norm > 3.89282805 > 6204e-005 ||Ae||/||Ax|| 1.851882441357e-005 > 36 KSP preconditioned resid norm 2.011575409369e-005 true resid norm > 3.89282805 > 6204e-005 ||Ae||/||Ax|| 1.851882441357e-005 > > Btw, I am solving the x and y momentum eqns so there 's 2 eqns to solve. > Do you solve them separately or both at once? (We usually recommend the latter.) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110708/136cffd5/attachment.htm>
