Does -log_summary with an example code - say src/ksp/ksp/examples/tutorials/ex2.c or ex2f.F
Perhaps you are missing a call to PetscFinalize() in your code? Satish On Wed, 11 Jun 2008, Etienne PERCHAT wrote: > Hi Barry, > > I don't understand why but -log_summary does not produce anything. > I've checked that the code has been compiled with DPETSC_USE_LOG. > > Any tips ? > Thanks, > > Etienne > > -----Message d'origine----- > De?: owner-petsc-users at mcs.anl.gov [mailto:owner-petsc-users at > mcs.anl.gov] De la part de Barry Smith > Envoy??: vendredi 6 juin 2008 16:39 > ??: petsc-users at mcs.anl.gov > Objet?: Re: KSPCR with PCILU generally slower with v2.3.3 than with 2.3.0 > > > If you run both cases with -log_summary you'll see where it is > spending more time. > Mail along the -log_summary output. > > Barry > > On Jun 6, 2008, at 6:27 AM, Etienne PERCHAT wrote: > > > Hi Barry, > > > > Using -ksp_truemonitor does not change anything. I have the same > > number of iterations in the 3 cases (v2.3.3p8 + true_monitor, > > v2.3.3, v2.3.0) and the same final residual norm but with v2.3.0 the > > code is slightly faster. > > > > I have to stress that I also monitor convergence with KSPMonitorSet > > in order to store the "best residual" and the "best solution" (I did > > not test if it is still useful in 2.3.3). > > > > Etienne > > > > -----Message d'origine----- > > De : owner-petsc-users at mcs.anl.gov [mailto:owner-petsc-users at > > mcs.anl.gov > > ] De la part de Barry Smith > > Envoy? : jeudi 5 juin 2008 20:28 > > ? : petsc-users at mcs.anl.gov > > Objet : Re: KSPCR with PCILU generally slower with v2.3.3 than with > > 2.3.0 > > > > > > This could also be the result of changes in the way we test for > > convergence. > > Try with -ksp_truemonitor and see if it is using the same number of > > iterations > > to converge. > > > > Barry > > > > On Jun 5, 2008, at 5:35 AM, Etienne PERCHAT wrote: > > > >> Hello, > >> > >> I'm solving MPIBAIJI matrices using KSPCR preconditioned by a > >> PCBJACOBI > >> between sub domains and PCILU with a fill ratio of 1 on each sub > >> domain. > >> > >> Solving exactly the same linear systems, I notice that the solution > >> is > >> slower using v2.3.3p8 than with v2.3.0. > >> The behavior is not very clear: v2.3.3p8 is generally slower (10 % or > >> more) but on some systems it happen to be really faster (may be 40 > >> %). > >> > >> Unhappily in my case at the end I'm always slower ... > >> > >> Did somebody noticed such behavior? Is there changes if I upgrade to > >> current 2.3.3p13 version (I've seen a fix:" fix error with using > >> mpirowbs & icc & ksp_view") ? > >> > >> Thanks, > >> Etienne Perchat > >> > >> > > > > > > > > > >
