dolfin team mailing list archive

[Garth Wells <612579@xxxxxxxxxxxxxxxxxx>]

On Mon, 2010-08-02 at 18:28 +0000, Anders Logg wrote:
> On Mon, Aug 02, 2010 at 04:15:54PM -0000, Johan Hake wrote:
> > It looks like there is something fishy with the cashing. I can have look
> > at it
> >
> > Johan
> 
> There have been some regressions in the speed of caching, probably as
> a result of the FFC rewrite earlier this year. See fem-jit-python here:
> 
>    http://www.fenics.org/bench/
> 
> I haven't bothered to examine it in detail since I thought it was
> "good enough" but apparently not.
> 

It probably is "good enough" in practice. There may be some issues
following the fix of some memory leaks in Instant earlier this year.

Garth

> It would be very welcome if you had a look at it. If you need my help
> I can jump in.
> 
> --
> Anders
>

-- 
Huge performance problem in Python interface
https://bugs.launchpad.net/bugs/612579
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Status in DOLFIN: New

Bug description:
In my Python Code I need to evaluate a nonlinear functional many times. This was rather slow and after a profile run, I've noticed that 90% of the time was spent in the __init__ routine of form.py to compile the form. As far as I can survey the code, this should be necessary only once. 

I have attached a simple example that illustrates the effect. In my test, the second code is roughly 40 times faster.