[Carpet] Carpet::checksum_timelevels

[Bela Szilagyi]

I guess an extra level of checking is always useful, especially when staring 
at mysterious crashes of all sorts.

But I would not make this a high priority.  Maybe at the upcoming workshop at 
AEI we could take a look at this.

Bela.

On Sunday 19 November 2006 00:03, Erik Schnetter wrote:
> Checksumming in Carpet is there to ensure that grid functions do not
> change when they are not supposed to change.  Carpet creates a
> checksum when it thinks an entity should remain constant, and checks
> the checksum before it is allowed to change again.
>
> Checksumming was never popular, and I am afraid it has apparently
> seen some bit-rot.  That means that Carpet has now new features, and
> these do not work together with checksumming.  Since checksumming was
> not used, no one spent the time and effort to ensure that it
> continues to work correctly.
>
> If you are interested in checksumming, we can make it work again.
>
> -erik
>
> On Nov 18, 2006, at 16:37:42, Bela Szilagyi wrote:
> > Just to make the statement more precise:  I could get the same
> > assertion
> > failure using the minimal-lenght parfile
> >
> > ActiveThorns="IOUtil Carpet CarpetLib Boundary CartGrid3D CoordBase
> > SymBase "
> > Carpet::checksum_timelevels=yes
> >
> > On Saturday 18 November 2006 22:26, Bela Szilagyi wrote:
> >> Is the parameter Carpet::checksum_timelevels every to be used for
> >> users'
> >> code-testing?
> >>
> >> I tried it and got a very quick reply from carpet:
> >>
> >> cactus_harm:
> >> /home/szilagyi/Cactus/configs/harm/build/Carpet/Checksum.cc:110: void
> >> Carpet::CheckChecksums(const _cGH *, Carpet::checktimes): Assertion
> >> `(int)checksums.size()==maxreflevels' failed.
> >> p0_6443:  p4_error: interrupt SIGx: 6
> >>
> >>
> >> I am using an up-to-date version of everything, I believe.
> >> My trimmed-down parameters are
> >>
> >>
> >> ActiveThorns = "IOUtil"
> >> ActiveThorns = "Carpet CarpetLib CarpetInterp CarpetReduce
> >> CarpetSlab"
> >> ActiveThorns = "Boundary CartGrid3D CoordBase SymBase "
> >> ActiveThorns = "CarpetRegrid"
> >>
> >>
> >> Carpet::domain_from_coordbase           = yes
> >> Carpet::enable_all_storage = no
> >>
> >> CartGrid3D::type                        = coordbase
> >>
> >> CoordBase::domainsize                   = minmax
> >> CoordBase::xmax                         =  8.0
> >> CoordBase::ymax                         =  8.0
> >> CoordBase::zmax                         =  8.0
> >> CoordBase::xmin                         = -8.0
> >> CoordBase::ymin                         = -8.0
> >> CoordBase::zmin                         = -8.0
> >> CoordBase::dx                           =   0.4
> >> CoordBase::dy                           =   0.4
> >> CoordBase::dz                           =   0.4
> >>
> >> Carpet::max_refinement_levels           = 10
> >> CarpetRegrid::refinement_levels         = 2
> >> CarpetRegrid::refined_regions           = manual-coordinate-list
> >> CarpetRegrid::smart_outer_boundaries    = yes
> >> CarpetRegrid::coordinates = "[ [([-3,-3,-3]:[3,3,3]:
> >> [0.2,0.2,0.2]) ] ]"
> >>
> >> Carpet::checksum_timelevels                             = yes
> >
> > --
> > Bela Szilagyi
> >
> > Max-Planck-Institut für Gravitationsphysik
> > Albert-Einstein-Institut
> > Tel: +49 331 567 7632
> > Fax: +49 331 567 7649
> >
> > _______________________________________________
> > developers mailing list
> > developers at lists.carpetcode.org
> > http://lists.carpetcode.org/listinfo/developers

-- 
Bela Szilagyi

Max-Planck-Institut für Gravitationsphysik
Albert-Einstein-Institut
Tel: +49 331 567 7632
Fax: +49 331 567 7649