[Developers] inv problems.

John Sibert sibert at hawaii.edu
Thu May 19 12:13:56 PDT 2011

I seem to recall a recent message from Derek implying that he had fixed 
the speed issue.

On 05/19/2011 08:02 AM, Arni Magnusson wrote:
> Hi Dave,
> I notice that I'm the only recipient of this important question. I 
> appreciate your faith in me, but efficient linear algebra with AD 
> objects is really outside my area of expertise.
> I haven't looked at the inverse or solve code (old, new, or proposed), 
> but posted the GCC profile diagnostics to help the development team to 
> improve the performance of the 'vol' example, which became 3 times 
> slower between 9.1 and 10.0. The profile diagnostics point at some 
> culprit functions, and Derek Seiple told me (25 Apr email) that he is 
> currently following those leads.
> This is definitely a high-priority issue. Given the nature of the 
> problem (we have 9.1 code that works fast) and the upcoming developer 
> workshop, I'm optimistic it will be solved in version 10.2 or 11.0.
> Cheers,
> Arni
> On Thu, 19 May 2011, dave fournier wrote:
>> Hi,
>> I'm a bit woried about these problmes with inv and maybe solve taking 
>> so long.
>> It kind of breaks the entire software. That is what I alway expected 
>> to happen eventually.  The idea is that it is supposed to be fast. I 
>> produced a sketch of the code proper working code but it seems to 
>> have been screwed up. Any thoughts?
>> Dave
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John Sibert
Emeritus Researcher, SOEST
University of Hawaii at Manoa

Visit the ADMB project http://admb-project.org/

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