KSPCR with PCILU generally slower with v2.3.3 than with 2.3.0

[Satish Balay]

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
> Envoyé : vendredi 6 juin 2008 16:39
> À : 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
> > Envoyé : jeudi 5 juin 2008 20:28
> > À : 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
> >>
> >>
> >
> >
> >
> 
> 
> 
>