[Paraview] VTK/ParaView and shared libs ...

[Utkarsh Ayachit]

Stefan,

Can you try doing a ldd on the paraview executable. Is in statically
linking OpenGl? I wonder if brings in different implementations if
that happens.

Utkarsh

On Thu, May 31, 2012 at 11:40 PM, Stefan Melber <Stefan.Melber at dlr.de> wrote:
> Hi,
>
>
> i noticed an behavior of VTK, which i cant explain at the moment. Maybe,
> someone found the same effect and has some thoughts ...
>
> Ok - what was done:
>
> o compiling ParaView 3.14.1 with QT 4.6.2 on a 64bit linux box
> o comparing the Version without and with shared libs (BUILD_SHARED off and
> on)
> o starting ParaView and have a look on the loading time / the time for the
> first interaction (e.g. clicking on load-button)
> o measure the loading time of an complex case and the time for the rendering
> after a rotation of the (complex) model on the screen
> o measurements done with TimerLog of ParaView
>
> What i found was:
>
>        | static          | shared
> =====================================
> GUI    | ok              | slow
> Load   | 7.139 sec.      | 11.47 sec.
> Rotate | 0.088 sec.      | 0.029 sec.
>
> The slow GUI response (approx. 3-5 secs) of the shared variant is clear
> because of the loading time of all libs. The same holds for the "Load" -
> however - why is the render time after a rotation more then two times faster
> as for the static case?
>
> Further on, these test above was done on a linux box with Quadro4000
> graphics card, 295.33 NVidia driver, SLED-Linux with 3.0.13er kernel and
> Xorg 7.4.
>
> Now, i did the same tests on the same linux box, but with OpenSuse 12.1,
> 3.1.10er kernel and Xorg 7.6 and got
>
>        | static          | shared
> =====================================
> GUI    | ok              | ok
> Load   | 7.279 sec.      | 11.28 sec.
> Rotate | 0.5 sec.        | 0.028 sec.
>
> Thats now really interesting: In both cases (static and shared) now the GUI
> is fast - why - i dont know. The Loading time is comparable to SLED - but
> the render time of the static case is now about 6 times slower then with
> SLED?! And - it has some unsteady delays in the redraw. The shared variant
> is ok and again faster then the static one...
>
> Any ideas why the rendering is faster with shared libs?!
>
> Best regards and thank you,
>
>      Stefan
>
>
>
>
>
>
>
> ===============================================================
>
>                      _/          Stefan Melber-Wilkending
>                    _/_/          ------------------------
>                  _/  _/
>          _/_/_/_/_/_/_/_/_/_/     German Aerospace Center
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