Comment 7 for bug 956979

On Mar 16, 2012 4:25 PM, "Anders Logg" <email address hidden> wrote:
>
> On Fri, Mar 16, 2012 at 03:04:14PM -0000, Martin Sandve Alnæs wrote:
> > On 16 March 2012 15:49, Johan Hake <email address hidden> wrote:
> > > This is really a duplication of bug 897372, which compared FFc and
SFC,
> > > as SFC compiles the attached form just fine. The generated code is
much
> > > smaller. Talking with Martin, I get the impression that FFC does not
use
> > > the information UFL provides about the internal structure of the
> > > different sub expressions. I got the impression that FFC lump the
whole
> > > expression into a large string.
> >
> > ... for arguments to MathFunctions that is, according to earlier
> > comments from Kristian.
> >
> > Material models for biological tissue often have rather complex
> > arguments to e.g. exp.
> >
> > But Johan, did you try _with_ ffc optimization? I believe that may
> > improve the size of the generated code.

No, that was turned of to improve performance of FFC, which was fixed by my
previous commit. Will test with optimization on.

> I thought the issue was the number of quadrature points used by FFC
> trying to integrate the expression exactly. Does it not help to reduce
> the quadrature order?

It definitely helped but here I am using quadrature order 2.

Johan

> --
> Anders
>
>
> > Martin
> >
> >
> > > Subdividing this string is probably
> > > suboptimal compared to using the information already stored in UFL.
> > >
> > >
> > > Title:
> > > FFC generate code which cannot be compiled
> > >
> > > Status in FEniCS Form Compiler:
> > > New
> > >
> > > Bug description:
> > > I have a viscoelastic biomechanics form which generate an .h file
> > > which is 45M large, with a single line length of 44M characters long.
> > > This wont compile with gcc. No optimization enabled at all.
> > >
> > > To manage notifications about this bug go to:
> > > https://bugs.launchpad.net/ffc/+bug/956979/+subscriptions
> >
>
> --
> You received this bug notification because you are a member of FFC Core
> Team, which is subscribed to FFC.
> https://bugs.launchpad.net/bugs/956979
>
> Title:
> FFC generate code which cannot be compiled
>
> Status in FEniCS Form Compiler:
> New
>
> Bug description:
> I have a viscoelastic biomechanics form which generate an .h file
> which is 45M large, with a single line length of 44M characters long.
> This wont compile with gcc. No optimization enabled at all.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ffc/+bug/956979/+subscriptions