dolfin team mailing list archive

[Martin Sandve Alnæs <martinal@xxxxxxxxx>]

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