dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Tue, Oct 26, 2004 at 09:19:22AM -0500, Robert C.Kirby wrote:

> The whole point of the ferari paper is how quickly you can build local 
> stiffness matrices.  I think the attitude I have detailed above (local 
> computation/assembly << solve) is mainly true for:
> 1.) suboptimal solvers
> 2.) Low degree (say linear)
> 3.) Poisson
> 
> It's not as clear when you get to multilinear forms (e.g. 
> Navier-Stokes) what the relative costs are.  Also, the better your 
> solver is, the more likely you are to notice assembly time.

One example is the module elasticity-updated in DOLFIN for which
assembly time dominates solution time (using the old form evaluation
system in DOLFIN). This would be a typical example of a system which
is more complicated than Poisson and where assembly time may be
significant.

/Anders