dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

Alessio Quaglino wrote:
> > Alessio Quaglino wrote:
> > > > Alessio Quaglino wrote:
> > > > > > > - I don't know how to set the variable DOLFIN_VERSION present in
> > > > > > > init.cpp
> > > > > > DOLFIN_VERSION is a #define (see src/kernel/main/dolfin/constants.h).
> > > > > Yes sorry, the compiler actually says that the PACKAGE_VERSION
> > > > > variable
> > > > > is
> > > > > undefined.
> > > > >
> > > > > I managed to compile and link everything (using default BLAS libraries
> > > > > and
> > > > > I still haven't checked if UMFPACK works), however I still have quite
> > > > > big
> > > > > problems since my code runs very slowly (compared to linux) and almost
> > > > > gets stuck in the lump() routine because it takes ages.
> > > > Are you using uBLAS or PETSc? If you're using uBLAS, check the compiler
> > > > flags and make sure that you have -DNDEBUG. Otherwise, anything to do
> > > > with uBLAS will be dead slow.
> > > Yes, thanks. It seems VS had the similar flag -NDEBUG which helped quite
> > > a
> > > lot. I was also wondering if I could use some optimized BLAS like ATLAS.
> > DOLFIN doesn't use BLAS, but it may be used by libraries which DOLFIN
> > uses, such as PETSc and UMFPACK. uBLAS doesn't use BLAS.
>
> Just to be sure, since understanding how to use PETSc in VS will be
> cumbersome and time-consuming, if I switch to PETSc I can completely
> forget about uBLAS and get a faster implementation? 

No and no. DOLFIN is dependent on UMFPACK, and PETSc is not necessarily 
faster. The reason for using PETSc is to permit parallel computation and 
access to a wide range of solvers and preconditioners.

Garth


Are there any
> drawbacks coming from this choice (I suppose so, otherwise one would never
> use uBLAS)?
>
> Thanks,
> Alessio
>
>
> > Garth
> >
> > > Is ATLAS independent from BOOST or do I need to have both installed?
> > >
> > > Alessio
> > >
> > >
> > > > Garth
> > > >
> > > > > > It would be helpful if you submitted your fixes as an hg bundle (or a
> > > > > > series of small bundles, one for each set of fixes). I'm on parental
> > > > > > leave until the end of November so I have limited bandwidth, but
> > > > > > someone
> > > > > > else should be able to pick it up.
> > > > > I signed up to the FEniCS wiki so that I'll be able to add a short
> > > > > guide.
> > > > >
> > > > > Alessio
> > > > >
> > > > >
> > > > > > /Anders
> > > > > >
> > > > > >
> > > > > > > Alessio
> > > > > > >
> > > > > > >
> > > > > > >
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> > > > >
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