| Re: itools causing FC5 linux logout [message #50019] |
Thu, 07 September 2006 02:38  |
swisswuff
Messages: 7
Registered: January 2006
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Junior Member |
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I have a similar problem. I use Suse Linux 10.1 and IDL 6.2, as well as
IDL on OS X (G5 PPC). I would think that it is somewhat related to
memory usage or maybe some memory leakage.
The problem occurs when I use xobjview to display some idlgrpolygon or
idlgrvolume data.
Just trying IDL out on an Acer Veriton 3500 with an Intel i840 chipset,
using hardware acceleration as option for xobjview, rendering and
manipulation of the visualized data is without problem, but on closing
out from xobjvew, I would typically experience a log-out from KDE
already with moderate amounts of data (that shouldn't crash it). Using
software rendering as option for xobjview, I can't even get xobjview
up, but will have a log out of KDE before the data is visualized. These
are incidents that do not occur with really minute amounts of data, so
data size does seem to play a role. Visualizing a 512 x 512 x 10 voxel
sample with 16bit-data will predictably crash out of Linux despite
there being a 1.5GB RAM memory. The following IDL support trick does
not work / remains without effect:
http://www.ittvis.com/services/techtip.asp?ttid=3524
Running IDL on a Powermac G5 under OS X / X11, the problem occurs
slightly less frequently than that; there's an ATI graphics card
installed there. So, with very large data, there's a slight risk of IDL
crashing (not the X11 / OS X environment though) - particularly when
using xobjview's "quit" menu command (rather than just closing the
window).
Running IDL on my AMD Opteron workstation equipped with NVIDIA graphics
card, the problem does not occur when I use xobjview to display really
ample amounts of data in relation to the RAM available. I can really
max out the system. However, when I display very large models (without
being able to quantify it right now but close to the available limit in
RAM), I occasionally get IDL to close out (but not KDE or any other
window manager) - as under OSX, this happens mostly when I use the
"quit" command of xobjview, but typically not when closing the window.
Previously, running IDL under OS 9, I would experience a build-up or
accumulation of some type of memory overload: after 3-7
3D-visualizations with larger models, IDL would typically crash, or
crash the whole machine.
We use other customized 3D software, where the manufacturer told us
that they had the one or other un-understood crash with ATI cards, but
not with NVIDIA cards. Maybe there are differences in the way 3D
visualization is implemented and works? Maybe, all of the graphic cards
use rather extensive simplification models, that may or may not work
with IDL-generated data?
Wolf Schweitzer
Karl Schultz wrote:
> I doubt that it is a memory problem. It is more likely that the X server
> is crashing due to an OpenGL problem. When you say "logged out of your
> gnome session", do you mean that the X server is crashing and getting
> restarted?
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