Hi, Here are the files that contain all the information below. You can see that the matrices are the same, unless I am missing something here. :)
(I am resending them in compressed format). Regards, Billy. -----Original Message----- From: [email protected] on behalf of Matthew Knepley Sent: Sun 2/1/2009 6:07 PM To: PETSc users list Subject: Re: Performance degradation after upgrade to 3.0.0 In order to determine what is happening you first should: 1) Confirm that the solver setup is identical using -ksp_view for both versions 2) Determine that the matrices are identical. Output both matrices using MatView() with a PetscBinaryViewer. You can diff the files, and you can also solver both matrices using KSP ex10. 3) Look at the residuals using -ksp_monitor. If they are different, something else has changed. Matt On Sun, Feb 1, 2009 at 6:32 AM, Billy Ara?jo <billy at dem.uminho.pt> wrote: > > Hi, > > I have also verified that there has been a degradation of performance using > the new 3.0 version: > > This is my function calling PETSc: > > KSP ksp; > PC pc; > > KSPCreate (PETSC_COMM_WORLD, &ksp); > > KSPSetOperators (ksp, *A, *A, DIFFERENT_NONZERO_PATTERN); > > KSPSetType (ksp, KSPFGMRES); > > KSPGetPC (ksp, &pc); > > PCSetType (pc, PrecondProc); > > KSPSetInitialGuessNonzero (ksp, PETSC_TRUE); > > KSPSetTolerances (ksp, 1E-50, maxtol, PETSC_DEFAULT, maxiter); > > KSPSetFromOptions (ksp); > > KSPSolve (ksp, *b, *x); > > KSPGetIterationNumber (ksp, iter); > > KSPGetResidualNorm (ksp, res); > > KSPDestroy (ksp); > > > with previous version 2.3.3-p6: > > Number of iterations: 42 Residual: +7.073781E-13 Time: +8.615024E-03 > > now: > > Number of iterations: 500 Residual: +2.746161E-05 Time: +1.026870E-01 > > It is reaching maximum number of iterations. The only thing I changed was: > > MatSetOption (*A, MAT_SYMMETRIC); > to > MatSetOption (*A, MAT_SYMMETRIC, PETSC_TRUE); > > I think I didn't change anything else. > > > Regards, > > Billy. > -- 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 -------------- A non-text attachment was scrubbed... Name: not available Type: application/ms-tnef Size: 34286 bytes Desc: not available URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20090201/7d71fc08/attachment-0001.bin>
