dolfin team mailing list archive

[Robert Kirby <robert.c.kirby@xxxxxxxxx>]

I agree with these statements, Martin.  I would also recommend serious
profiling on a range of problems before substantial reengineering.


On Mon, Mar 23, 2009 at 8:18 AM, Martin Sandve Alnæs <martinal@xxxxxxxxx>wrote:

> On Mon, Mar 23, 2009 at 1:58 PM, A Navaei <axnavaei@xxxxxxxxxxxxxx> wrote:
> > 2009/3/23 Robert Kirby <robert.c.kirby@xxxxxxxxx>:
> >> Hi all, some thoughts:
> >> 1.) In the current paradigm (build + apply), building the matrix is
> >> typically not dominant in the overall run-time.
> >
> > Isn't this in contrast with what Kent said about matrix insertion
> > being the bottleneck? Are there any references for these claims?
>
> Matrix insertion is the bottleneck during the
> assembly of matrices from simple PDEs
> (at least simple ones).
>
> Depending on the application, other parts like the
> linear solver are often more costly than the assembly.
>
> Both these claims are easy to verify.
>
> Martin
>