[Dune] parallel DUNE grid for implementing a spherical shell (UGGrid)

Fri Nov 16 20:54:00 CET 2012

On Fri, Nov 16, 2012 at 06:19:03PM +0000, Eike Mueller wrote:
> Dear all,
> 
> I can now also generate the icosahedral macro grid (see attached
> .vtu file), however when I write this out with the DGFWriter, the
> prisms do not get written to disk. Is there a way around this or do
> I have to do it by hand?

you might consider using one of the other file formats... did you try
the amiramesh writer/reader?

Although I'm not sure how amiramesh handler boundary
parametrizations... If this is a problem, you could also easily
modifying the reader to use predefined boundary-parametrizations
instead of the missing ones from the file.

Christian

> Thanks a lot,
> 
> Eike
> 
> 
> 
> Eike Mueller wrote:
> >Dear all,
> >
> >thank you very much for all your help, I have now solved the load
> >balancing issue, at least for the hexahedral grid.
> >I wrote some sequential code which creates a macro grid with p
> >elements using the UGgrid factory, and save this as a .dgf file. I
> >then wrote a parser for .dgf files, which reads the grid from disk
> >and also adds boundary segments (this is not supported for UG at
> >the moment). If I then read in my .dgf file on p processors, all I
> >need to do is call loadBalance() and each processor automatically
> >ends up with one element, which I can then refine further. It
> >means that at some point I store the entire macro grid on one
> >processor, but I think that is fine, as this grid will maximally
> >contain 10,000s of cells, and there is probably no way this can be
> >avoided, even if I set up the grid with a factory in one go.
> >
> >I did come across some strange behaviour in the DGFWriter, though.
> >When writing out the file, I got a
> >
> >Warning: Ignoring nonpositive boundary id: 0
> >
> >and it would not add this boundary segment to the .dgf file, which
> >meant I could not read it properly later. I traced this down to
> >this bit of code in dune/grid/io/file/dgfparser/dgfwriter.hh:
> >
> >inline void DGFWriter< GV >::write ( std::ostream &gridout ) const
> >[...]
> >if( boundaryId <= 0 )
> >        {
> >          std::cerr << "Warning: Ignoring nonpositive boundary id: "
> >                    << boundaryId << "." << std::endl;
> >          continue;
> >        }
> >[...]
> >
> >If I change the condition to "if( boundaryId < 0 )"
> >
> >it works. Why does it exclude boundaryId = 0?
> >
> >Next goal is doing the same for the icosahedral grid, for this I
> >will need prisms, and again they should only be subdivided in the
> >horizontal direction.
> >
> >Thanks, Eike
> >
> >PS: Andreas, the code has been checked into the GungHo! repository.
> >
> >Oliver Sander wrote:
> >>Am 13.11.2012 12:29, schrieb Dedner, Andreas:
> >>>I might be wrong but I think Yasp only distributes the macro
> >>>grid like ALU does?
> >>>So if you start with only one element then there is no way to
> >>>loadbalance it.
> >>>As far as I know only UG differs from this behaviour allowing
> >>>to loadbalance leaf elements
> >>>"arbitrarily" over the processors....
> >>Yes, UG supposedly does that.  It is called 'vertical load
> >>balancing'.  I have never
> >>actually done that, though (never had to).  Therefore I don't
> >>really know how
> >>it works and whether you need special flags or anything.
> >>-- 
> >>Oliver
> >>
> >>>________________________________________
> >>>From: dune-bounces+a.s.dedner=warwick.ac.uk at dune-project.org
> >>>[dune-bounces+a.s.dedner=warwick.ac.uk at dune-project.org] on
> >>>behalf of Eike Mueller [E.Mueller at bath.ac.uk]
> >>>Sent: 13 November 2012 11:04
> >>>To: Oliver Sander
> >>>Cc: dune at dune-project.org
> >>>Subject: Re: [Dune] parallel DUNE grid for implementing a
> >>>spherical shell (UGGrid)
> >>>
> >>>To make it even simpler, I replaced the UGGrid by an 1x1x1
> >>>YaspGrid, i.e. I start with a grid with one element. If I
> >>>globalRefine() this once, and then loadBalance(), one
> >>>processor always ends up with the entire grid. I must be
> >>>missing something
> >>>very basic here.
> >>>Does the load balancing in DUNE assume that if a father cell
> >>>is owned by a processor, then all it's children on the finer
> >>>levels
> >>>are owned by the same processor? But then calling
> >>>loadBalance() after grid refinement would not make sense. If I
> >>>start with a
> >>>2x2x2 grid and do not refine, then it works, i.e. if I run on
> >>>8 cores, then each of them ends up getting one element.
> >>>
> >>>Thanks,
> >>>
> >>>Eike
> >>>
> >>>Oliver Sander wrote:
> >>>>Am 12.11.2012 16:01, schrieb Eike Mueller:
> >>>>>Hi Oliver,
> >>>>>
> >>>>>I tried several other strategies, but without any luck. Whatever I do,
> >>>>>the algorithm seems to refuse to split up the macro cells, i.e. the 6
> >>>>>elements I insert with the grid factory.
> >>>>>
> >>>>>I also tried to simplify the problem as much as possible. I now create
> >>>>>one unit cube with the grid factory, do not insert any boundary
> >>>>>segments and refine the grid by calling globalRefine(refcount), so
> >>>>>that I end up with a cartesian unit cube split into 8^refcount
> >>>>>elements. I then balance the grid with loadBalance() (i.e. no
> >>>>>arguments). I would have thought that that should work. Still, if I
> >>>>>refine 1,2 or 3 times (i.e. I should end up with 8,64,512 elements),
> >>>>>for an 8 core run only one process stores the entire grid.
> >>>>This should really work, can you post your test program?
> >>>>
> >>>>But be careful: If you load-balance small grids then all processors
> >>>>get all elements, but most of them only as ghosts.  Did you
> >>>>check that?
> >>>>
> >>>>cheers,
> >>>>Oliver
> >>>>
> >>>>>Could this be a problem with the grid factory?
> >>>>>
> >>>>>Thanks,
> >>>>>
> >>>>>Eike
> >>>>>
> >>>>>Oliver Sander wrote:
> >>>>>>Am 06.11.2012 08:44, schrieb Markus Blatt:
> >>>>>>>Hey Eike,
> >>>>>>>
> >>>>>>>On Mon, Nov 05, 2012 at 07:17:48PM +0000, Eike Mueller wrote:
> >>>>>>>>>And loadbalancing would only be needed for the macrogrid, e.g.,
> >>>>>>>>>not dynamic.
> >>>>>>>>>
> >>>>>>>>That's right, in the code I would refine the grid until there is
> >>>>>>>>only cell per processor (this is the macrogrid). Then I would call
> >>>>>>>>loadBalance, followed by further grid refinement. So for example
> >>>>>>>>with 24 processors, I would subdivide each of the six cells in the
> >>>>>>>>original grid into four cells, then loadbalance that
> >>>>>>>>grid and refine
> >>>>>>>>further.
> >>>>>>>Actually, this approach could be the root of the problem. The
> >>>>>>>loadbalancing is a heuristic algorithm and normally one always gets
> >>>>>>>some load imbalance here. But if you just have as many cells as
> >>>>>>>processor, then naturally some will end up with no cells at all.
> >>>>>>This is true, but it is not the whole truth.
> >>>>>>
> >>>>>>The default load balancing strategy of UG is Recursive Coordinate
> >>>>>>Bisection.
> >>>>>>This means roughly that the grid bounding box is partitionend into
> >>>>>>axis-aligned
> >>>>>>cells, and these cells are assigned to processors.  I reckon (I
> >>>>>>didn't check)
> >>>>>>that since your grid is a hollow sphere, some cells
> >>>>>>simply remain empty.
> >>>>>>
> >>>>>>UG offers several other strategies, but all this really is hardly
> >>>>>>tested.
> >>>>>>Have a look at the lbs method in ug/parallel/dddif/lb.c:533 for some
> >>>>>>alternatives.
> >>>>>>
> >>>>>>good luck,
> >>>>>>Oliver
> >>>>>>
> >>>>>>>How about doing some more refinement before load balancing?
> >>>>>>>
> >>>>>>>Cheers,
> >>>>>>>
> >>>>>>>Markus
> >>>>>>>
> >>>>>>
> >>>>>>_______________________________________________
> >>>>>>Dune mailing list
> >>>>>>Dune at dune-project.org
> >>>>>>http://lists.dune-project.org/mailman/listinfo/dune
> >>>>>
> >>>
> >>>-- 
> >>>Dr Eike Mueller
> >>>Research Officer
> >>>
> >>>Department of Mathematical Sciences
> >>>University of Bath
> >>>Bath BA2 7AY, United Kingdom
> >>>
> >>>+44 1225 38 5633
> >>>e.mueller at bath.ac.uk
> >>>http://people.bath.ac.uk/em459/
> >>>
> >>>_______________________________________________
> >>>Dune mailing list
> >>>Dune at dune-project.org
> >>>http://lists.dune-project.org/mailman/listinfo/dune
> >>>
> >>>
> >>
> >
> >
> 
> 
> -- 
> Dr Eike Mueller
> Research Officer
> 
> Department of Mathematical Sciences
> University of Bath
> Bath BA2 7AY, United Kingdom
> 
> +44 1225 38 5633
> e.mueller at bath.ac.uk
> http://people.bath.ac.uk/em459/

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>   </AppendedData>
> </VTKFile>

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-- 
Prof. Dr. Christian Engwer 
Institut für Numerische und Angewandte Mathematik
Fachbereich Mathematik und Informatik der Universität Münster
Einsteinstrasse 62
48149 Münster

E-Mail	christian.engwer at uni-muenster.de
Telefon	+49 251 83-35067
FAX		+49 251 83-32729