[Developers] inv problems.

Derek Seiple dseiple84 at gmail.com
Thu May 19 13:36:37 PDT 2011

Hi All,
Yes, I have made some improvements, but it is not yet back to the
speed that 9.1 had. I am going to make one more change to the code and
then see where we are. Once I've made the change and tested it I'll
report back.


On Thu, May 19, 2011 at 3:13 PM, John Sibert <sibert at hawaii.edu> wrote:
> I seem to recall a recent message from Derek implying that he had fixed the
> speed issue.
> John
> 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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