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<font size="-1">Hi,<br>
<br>
<br>
i noticed an behavior of VTK, which i cant explain at the moment.
Maybe, someone found the same effect and has some thoughts ...<br>
<br>
Ok - what was done:<br>
<br>
o compiling ParaView 3.14.1 with QT 4.6.2 on a 64bit linux box<br>
o comparing the Version without and with shared libs (BUILD_SHARED
off and on)<br>
o starting ParaView and have a look on the loading time / the time
for the first interaction (e.g. clicking on load-button)<br>
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<br>
o measurements done with TimerLog of ParaView<br>
<br>
What i found was:<br>
<br>
</font><tt><big><font size="-1"><big> | static |
shared<br>
=====================================<br>
GUI | ok | slow<br>
Load | 7.139 sec. | 11.47 sec.<br>
</big></font></big></tt><big><font size="-1"><big><tt>Rotate |
0.088 sec. | 0.029 sec. <br>
</tt></big></font></big><font size="-1"><br>
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 <u>two times faster as for the static case</u>?<br>
<br>
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.<br>
<br>
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<br>
<br>
</font><tt><big><font size="-1"><big> | static |
shared<br>
=====================================<br>
GUI | ok | ok<br>
Load | 7.279 sec. | 11.28 sec.<br>
</big></font></big></tt><big><font size="-1"><big><tt>Rotate |
0.5 sec. | 0.028 sec. <br>
</tt></big></font></big><font size="-1"><br>
</font><font size="-1">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<u> again faster then the static one</u>...<br>
<br>
Any ideas why the rendering is faster with shared libs?!<br>
<br>
Best regards and thank you,<br>
<br>
Stefan<br>
<br>
<br>
<br>
<br>
<br>
</font><font size="-1"> <br>
</font><font size="-1"> </font><br>
<tt>===============================================================<br>
<br>
_/ Stefan Melber-Wilkending <br>
_/_/ ------------------------ <br>
_/ _/ <br>
_/_/_/_/_/_/_/_/_/_/ German Aerospace Center <br>
_/ _/ _/ _/ -- DLR -- <br>
_/ _/ _/ _/ Member of
the <br>
_/_/_/_/_/_/_/_/_/_/ Helmholtz-Association <br>
_/ _/ _ _ <br>
_/_/ | \ | |_| Institute of Aerodynamics <br>
_/ |_/ |_ | \ and Flow Technology
<br>
Transport Aircraft Branch <br>
<br>
Fields of activities: Lilienthalplatz 7 <br>
o High-Lift Research D-38108 Braunschweig/Germany <br>
o Complex Configurations <br>
o Numerical Wind-Tunnel Phone ..: +49 531/295-2836 <br>
o Wind-Tunnel Design Fax. ...: +49 531/295-2914 <br>
o Supercomputing <br>
o Visualization Techniques Email ..: <a
class="moz-txt-link-abbreviated"
href="mailto:Stefan.Melber@dlr.de">Stefan.Melber@dlr.de</a><br>
o Glider-Aerodynamics Web ....: <a
class="moz-txt-link-freetext" href="http://www.dlr.de/AS">http://www.dlr.de/AS</a><br>
<br>
===============================================================<br>
</tt><br>
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