[Developers] [ADMB Users] ADMB meeting in Reykjavik - Doodle Poll
dave fournier
davef at otter-rsch.com
Mon Jun 17 08:04:45 PDT 2013
On 13-06-17 12:36 AM, Laurie Kell wrote:
The SPC guys use Condor for running many instances of a program
(MULTIFAN) . They also use it for
calculating the Hessian over multiple machines. From my point of view
these are legitimate, but trivial
instances of parallelization. If you are interested you might contact
Nick Davies (when he surfaces).
There are multi-threaded versions of the Blas which I have tested for
doing LU decomposition.
These are very fast for large matrices compared to the current code.
The interesting thing is
to understand their obtuse fortran formulations so that corresponding
adjoint code can be written
in C++. I would be interested in collaborating on that.
My current posting was more about true multi-threading, using pthreads.
I have a few trivial examples to show where the boilder plate goes and
an application to Multifan where we calculate the stuff for tag returns
for different tag releases
in parallel as well as a bit more parallelization.
Sibert also has done a "real world" example of this. His appears to get
much better results
that I do. At present I can get Multifan to run in about 57% of the time
for multi-threaded version
on an I7 laptop Sibert gets approx 5 fold improvement on some multicore
big machine.
I also would like the extend the multi-threading by adding the ability
to transparently use multiple hosts.
It two threads are on the same host they communicate via pthreads, if on
different hosts
they communicate via MPI. this should be almost effortless for the user.
Dave
> There are two main areas that we are looking at in the tuna RFMOs and
> elsewhere for running ADMB and AutoDiff code i.e.
> i) running many instances of a single program e.g. over a grid or ii)
> using parallel computing for a single operation such as inverting a
> hessian.
>
> Looking at some examples of each and then thinking about ways forward
> could be a start.
>
> Laurie
>
>
> On Sat, Jun 15, 2013 at 2:35 AM, dave fournier <davef at otter-rsch.com
> <mailto:davef at otter-rsch.com>> wrote:
>
> On 13-06-14 01:01 PM, Laurie Kell wrote:
>
>
> I'm happy to collaborate, but how would it function. I only want
> to do 90% of the work.
>
> multi-threading is something that I would like to be involved
> in, and I know of others who would be keen to collaborate.
>
> Laurie
>
>
>
> On 14/06/13 16:33, dave fournier wrote:
>
> On 13-06-14 01:40 AM, Mark Payne wrote:
>
>
> I wish that all the players could be encouraged to discuss
> future
> directions BEFORE the actual meeting.
> I think that is what the mail lists are for. There is not
> enough time
> at a meeting to initiate a discussion on
> any substantive issue and develop it to a useful level.
>
> For example at the recent meeting Sibert and I presented
> some results on
> multi-threading which indicate
> that it can be useful enough for ADMB programs to justify
> serious
> development efforts. Getting this together
> required about 3 months of programming/discussion to
> prepare for the
> meeting.
>
> With regard to multi-threading, this looks interesting.
>
> http://www.tomshardware.com/news/Intel-Xeon-Phi-Coprocessor-CPU,22700.html
>
> Dave
>
>
> Have you considered having a users session on the side
> of the ASC - after all, there will be many of the ICES
> users there.... Wednesday afternoon is usually free
> for that sort of thing. And it might be nice for some
> of us non-developers to chat with you, hear future
> directions, and give feedback....
>
> Mark
> ________________________________________
> Fra: users-bounces at admb-project.org
> <mailto:users-bounces at admb-project.org>
> [users-bounces at admb-project.org
> <mailto:users-bounces at admb-project.org>] på vegne
> af Arni Magnusson [arnima at hafro.is
> <mailto:arnima at hafro.is>]
> Sendt: 13. juni 2013 23:07
> Til: developers at admb-project.org
> <mailto:developers at admb-project.org>;
> users at admb-project.org <mailto:users at admb-project.org>
> Cc: Athol Whitten; Rishi Sharma; Andre Punt; Dave
> Fournier; Kasper Kristensen; Laurie Kell; Polina Levontin
> Emne: [ADMB Users] ADMB meeting in Reykjavik - Doodle Poll
>
> Dear friends,
>
> The upcoming ADMB Developers' workshop in Reykjavik in
> September was
> discussed a bit at the ADMB Foundation board meeting
> last week. There are
> two other relevant conferences taking place in
> Reykjavik in the same
> month:
>
> 12-14 Sep (Thu-Sat), LGM conference in Reykjavik
> https://sites.google.com/site/lgm2013ice/
>
> 23-27 Sep (Mon-Fri), ICES conference in Reykjavik
> http://ices.dk/news-and-events/asc/ASC-2013/Pages/default.aspx
>
> Initially, we (Anders, Arni, Hans) scheduled the ADMB
> meeting 8-11
> September, just prior to the LGM conference. Now that
> our LGM abstract has
> been rejected, our focus is shifting to the ICES
> conference.
>
> It seems likely that some ADMB-oriented people might
> attend the ICES
> conference. To make it practical to visit Iceland and
> attend both the ADMB
> and ICES events, we could shift the ADMB meeting to be
> just before or
> after the ICES meeting.
>
> ---
>
> Therefore, I have set up a Doodle Poll:
>
> http://doodle.com/dx5et3fe4dfp2d48
>
> Please mark the days that you would _prefer_. If there
> are days you
> _cannot_ make it, please email me so I can take that
> into account. Ignore
> this poll if you don't plan to attend. Feel free to
> forward this email to
> others.
>
> At the end of the poll, we are looking for a 4-day
> slot for the ADMB
> meeting.
>
> The range between 17 Sep and 1 Oct would be practical
> for anyone planning
> to attend both the ADMB and ICES events. If I'm the
> only one attending
> both, there may be no practical reason to shift the
> ADMB meeting.
>
> Let's finish this poll before Wednesday (19 June) and
> make a decision.
>
> Looking forward to welcoming you to Iceland this autumn,
>
> Arni
>
> P.S. If you urgently need a reason to attend the ICES
> conference, I can
> add you as a coauthor on a simple paper that's been
> accepted in Session Q
> on Bayesian methods. Your contribution would be in the
> introduction and
> discussion sections. This might help convince your
> employer about the need
> to travel to Reykjavik this autumn.
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>
>
>
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