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
_/ _/ _/ _/ -- DLR --
_/ _/ _/ _/ Member of the
_/_/_/_/_/_/_/_/_/_/ Helmholtz-Association
_/ _/ _ _
_/_/ | \ | |_| Institute of Aerodynamics
_/ |_/ |_ | \ and Flow Technology
Transport Aircraft Branch
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o High-Lift Research D-38108 Braunschweig/Germany
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===============================================================
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