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Message #00138
Re: Re: Linear Algebra
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To:
Ridgway Scott <ridg@xxxxxxxxxxxxxxx>
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From:
Anders Logg <logg@xxxxxxxxx>
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Date:
Tue, 26 Oct 2004 13:37:48 -0500
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Cc:
claes@xxxxxxxxxxxxxxxx, dolfin-dev@xxxxxxxxxx, knepley@xxxxxxxxxxx, eriksv@xxxxxxxxxxxxxxxx, kirby@xxxxxxxxxxxxxxx
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In-reply-to:
<20041026170803.AB8E14D4D0@merlin.cs.uchicago.edu>
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Mail-followup-to:
Ridgway Scott <ridg@xxxxxxxxxxxxxxx>, dolfin-dev@xxxxxxxxxx, logg@xxxxxxxxx, claes@xxxxxxxxxxxxxxxx, eriksv@xxxxxxxxxxxxxxxx, kirby@xxxxxxxxxxxxxxx, knepley@xxxxxxxxxxx
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Reply-to:
Discussion of DOLFIN development <dolfin-dev@xxxxxxxxxx>
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User-agent:
Mutt/1.5.6+20040907i
On Tue, Oct 26, 2004 at 12:08:03PM -0500, Ridgway Scott wrote:
> > 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.
>
> This is a good point. There are these complex-model linear problems
> where you just form the matrix and solve. Is that what you were
> thinking? Since you can vary the elasticity tensor these days with
> special materials, one could even imagine optimizing over varying
> elasticity tensors, in an extreme case.
>
> Ridg
Yes. In this case, you form the matrix, solve, and modify (move) the
mesh in each time step. The domininating cost is the assembly.
/Anders
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