dolfin team mailing list archive

["Matthew Knepley" <knepley@xxxxxxxxx>]

---------- Forwarded message ----------
From: Matthew Knepley <knepley@xxxxxxxxx>
Date: Wed, Aug 6, 2008 at 4:24 AM
Subject: Re: [DOLFIN-dev] Assembly benchmark
To: "Garth N. Wells" <gnw20@xxxxxxxxx>


On Wed, Aug 6, 2008 at 4:20 AM, Garth N. Wells <gnw20@xxxxxxxxx> wrote:
>> ok, here's the page, let's see some numbers:
>>
>>   http://www.fenics.org/wiki/Benchmark
>>
>
> I just added my results.
>
> The most obvious difference in our systems is 32/64 bit which could
> likely account for the differences. MTL4 seems considerably faster on
> the 32 bit system.

I need to understand the categories into which the time is divided:

 1) They do not add to the total (or even close)

 2) I am not sure what is going on within each unit

 3) This is still much more expensive than my PETSc example (which can be
     easily run. Its ex2 in KSP).

Thus it is hard for me to be convinced that something underneath is just not
preventing fast operation. Furthermore, this is not checked against a
performance
model, say plotted against the number of cells.

 Matt

> Garth
--
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which
their experiments lead.
-- Norbert Wiener



-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which
their experiments lead.
-- Norbert Wiener