ffc team mailing list archive

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

Quoting Johan Hoffman <jhoffman@xxxxxxxxxxx>:

> Looks great!
> 
> A question regarding Numeric: I hear that Numeric has been replaced by
> Numarray in Python? Does that change anything in the installation and
> usage of FIAT/FFC?

Seems like Numarray is also going to cease in favour of SciPy.

Garth

> 
> /Johan
> 
> 
> > Commit from logg (2005-12-05 18:26 CET)
> > ----------------
> >
> > Restructure computation of reference tensor to use less memory.
> >
> > As a side effect, the speed of the computation was actually improved...
> >
> > Here are some results for compiling the nonlinear term of Navier-Stokes
> for quadratics on tets:
> >
> >          | FFC 0.2.2  | FFC 0.2.3 | Current CVS
> > --------------------------------------------------
> > CPU time | 167 s      | 21 s      | 15 s
> > Memory   | 22 MB      | 489 MB    | 27 MB
> >
> > The memory usage is actually around 22 MB during most of the
> computation.
> > The 27 MB is only during a short peak (while copying some values from
> one tensor to another).
> >
> > FFC 0.2.2 used an old loop-based approach, while FFC 0.2.3 worked
> through Numeric. The current CVS works similarly to version 0.2.3, but
> instead of building a giant tensor and then doing contractions on that
> tensor, there are now loops over the dimensions to be contracted so that
> we don't build any tensors larger than the final reference tensor.
> >
> > Also note that it now takes about 1 second to compile the nonlinear term
> of
> > Navier-Stokes for linears. This is a good speedup compared to the
> initial
> > 130 seconds with FFC version 0.1.4...
> >
> >   ffc  ChangeLog                                1.104
> >   ffc  src/ffc/compiler/monomialintegration.py  1.4
> >   ffc  src/ffc/compiler/referencetensor.py      1.19
> >   ffc  src/reference/Elasticity.h               1.32
> >   ffc  src/reference/EnergyNorm.h               1.10
> >   ffc  src/reference/Mass.h                     1.18
> >   ffc  src/reference/NavierStokes.h             1.30
> >   ffc  src/reference/Projection.h               1.7
> >   ffc  src/reference/Stokes.h                   1.15
> >
> > _______________________________________________
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> >
> 
> 
> 
> 
> 
> 
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