dolfin team mailing list archive

["Garth N. Wells" <g.n.wells@xxxxxxxxxx>]

How does it compare now with PETSc?

I've added and removed several times with the uBlas flag -NDEBUG when 
using --enable-debug. Without it uBlas is too slow to be useful, and 
with it some errors can (and have) crept in. We could add a configure 
option flag --disable-ublas-debug?

When using uBlas make sure that you use "alias" (e.g. alias(x) = y) 
whenever possible. There are also some ways to speed up element access 
for sparse vectors and matrices (see the last section on 
http://www.boost.org/libs/numeric/ublas/doc/operations_overview.htm).

Garth


Anders Logg wrote:
> Yes! Runs much faster than before now with --enable-optimization.
>
> Thanks
> /Anders
>
>
> On Mon, Aug 21, 2006 at 04:18:58PM +0200, Garth N. Wells wrote:
> > Did you use --enable-debug? This slows uBlas down with a factor of about 10.
> >
> > Garth
> >
> > DOLFIN wrote:
> > > One or more new changesets pushed to the primary DOLFIN repository.
> > > A short summary of the last three changesets is included below.
> > >
> > > changeset:   2147:72ba0f91c6a891f8a088a5802000ee1c153113f6
> > > tag:         tip
> > > user:        "Anders Logg <logg@xxxxxxxxx>"
> > > date:        Mon Aug 21 16:16:15 2006 +0200
> > > files:       src/bench/ode/reaction/bench.log src/bench/ode/wave/bench.log 
> > > src/bench/ode/wave/main.cpp
> > > description:
> > > Make ODE benchmarks independent of PETSc.
> > > Benchmarks run slow compared to previous versions which used PETSc.
> > > Need to find out what goes wrong.
> > >
> > >
> > > changeset:   2146:549fe838f11c3fcdf1200e841fd52e1057337d23
> > > user:        "Anders Logg <logg@xxxxxxxxx>"
> > > date:        Mon Aug 21 14:41:20 2006 +0200
> > > files:       ChangeLog src/kernel/mf/Makefile.in 
> > > src/kernel/mf/MatrixFactory.cpp src/kernel/mf/dolfin/ConvectionMatrix.h 
> > > src/kernel/mf/dolfin/Makefile.am src/kernel/mf/dolfin/Makefile.in 
> > > src/kernel/mf/dolfin/MatrixFactory.h 
> > > src/kernel/mf/dolfin/StiffnessMatrix.h src/kernel/mf/dolfin/dolfin_mf.h 
> > > src/kernel/mf/ffc-forms/ConvectionMatrix2D.form 
> > > src/kernel/mf/ffc-forms/ConvectionMatrix2D.h 
> > > src/kernel/mf/ffc-forms/ConvectionMatrix3D.form 
> > > src/kernel/mf/ffc-forms/ConvectionMatrix3D.h
> > > description:
> > > Add class ConvectionMatrix and corresponding class to matrix factory.
> > >
> > >
> > > changeset:   2145:371b275e8b34d6b754ff79f29c75c87303cac868
> > > user:        "Anders Logg <logg@xxxxxxxxx>"
> > > date:        Mon Aug 21 14:24:53 2006 +0200
> > > files:       ChangeLog src/kernel/mf/Makefile.in 
> > > src/kernel/mf/MatrixFactory.cpp src/kernel/mf/dolfin/LoadVector.h 
> > > src/kernel/mf/dolfin/Makefile.am src/kernel/mf/dolfin/Makefile.in 
> > > src/kernel/mf/dolfin/MassMatrix.h src/kernel/mf/dolfin/MatrixFactory.h 
> > > src/kernel/mf/dolfin/StiffnessMatrix.h src/kernel/mf/dolfin/dolfin_mf.h 
> > > src/kernel/mf/ffc-forms/LoadVector2D.form 
> > > src/kernel/mf/ffc-forms/LoadVector2D.h 
> > > src/kernel/mf/ffc-forms/LoadVector3D.form 
> > > src/kernel/mf/ffc-forms/LoadVector3D.h
> > > description:
> > > Add class LoadVector and corresponding static function to
> > > MatrixFactory.
> > >
> > >
> > > -------------------------------------------------------
> > > For more details, visit http://www.fenics.org/hg/dolfin
> > > _______________________________________________
> > > DOLFIN-dev mailing list
> > > DOLFIN-dev@xxxxxxxxxx
> > > http://www.fenics.org/mailman/listinfo/dolfin-dev
> _______________________________________________
> DOLFIN-dev mailing list
> DOLFIN-dev@xxxxxxxxxx
> http://www.fenics.org/mailman/listinfo/dolfin-dev

--

Dr. Garth N. Wells
Faculty of Civil Engineering and Geosciences
Delft University of Technology
Stevinweg 1
2628 CN Delft
Netherlands

tel.   +31 15 278 7922
fax.   +31 15 278 6383
e-mail g.n.wells@xxxxxxxxxx
url    http://www.mechanics.citg.tudelft.nl/~garth