[Insight-developers] Not Really Parallel Build

[Luis Ibanez]

Hi Kevin,

Thanks for posting this profiling information.

I'm not sure I'm following the logic, so let me extend your
 table here, and correct me if I'm gathering incorrect data:


computer       build-time        test-time           cmake
---------------------------------------------------------------------
 bubbles      -j8     110.5        -j8      33.4          CVS
 kitty            -j16    12.6       none      7.3          2.4
 candy         -j16    12.6       none      7.4          2.4
 bambi         -j16    12.6       none      7.4          2.4


Is this correct ?

before we start speculating
on the possible explanations  :-)


Also, the command that you are using for bubbles in:
http://www.cdash.org/CDash/viewNotes.php?buildid=469434

                 "ctest -j8 -D Nightly"


looks fine,
(subject to a CMake Guru review..)


     Luis


---------------------------------------------------------------------------------
On Wed, Nov 11, 2009 at 10:36 AM, Kevin H. Hobbs <hobbsk at ohiou.edu> wrote:
> I have four new workstations bubles, kitty, candy, and bambi.
>
> All of these are set up to submit a nightly build of ITK.
>
> kitty, candy, and bambi are set up to build ITK in parallel using gmake
> -i -j 16 . (There are 8 cores but gcc seems quite happy with two
> processes per core.)
>
> I wanted to experiment with using CMake's new parallel build and test
> feature. So I set the build on bubbles to use CTest from CVS with the
> -j8 option (Tests may not be so happy with 2 threads per core.)
>
> I expected the build on bubbles to be half as fast as the builds on
> kitty, candy, and bambi, and the testing on bubbles to be eight times as
> fast as the testing on kitty, candy, and bambi.
>
> What I got was :
>        build   test
> bubbles 110.5   33.4
> kitty   12.6    7.3
> candy   12.6    7.4
> bambi   12.6    7.4
>
> Did I incorrectly set up the parallelism with CTest?
>
> The notes file for bubbles is here :
>
> http://www.cdash.org/CDash/viewNotes.php?buildid=469434
>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Kitware offers ITK Training Courses, for more information visit:
> http://kitware.com/products/protraining.html
>
> Please keep messages on-topic and check the ITK FAQ at:
> http://www.itk.org/Wiki/ITK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.itk.org/mailman/listinfo/insight-developers
>
>