dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

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 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.