Linux - OcTree Problem

sober · Post by **sober** » Tue Nov 28, 2006 7:44 am

I am having a mesh ([url=http://irrlicht.sourceforge.net/phpBB2/ ... hp?t=17286]here is the thread[/quote]) and ) I generate a OcTreeSceneNode out of it.

When I use windows this takes around 1-2 seconds. I am using gcc under windows. When I boot Linux and recompile the code there (same PC again gcc) the generation of the OcTree takes 21 Seconds.

Does anyone has an Idea, what can cause this differences?

hybrid · Post by **hybrid** » Tue Nov 28, 2006 8:31 am

Probably different compiler settings. Linux compiles a debug version without optimization by default, while the windows version has it the other way round.

sober · Post by **sober** » Tue Nov 28, 2006 9:46 am

well, I will use -O2 or -O3 than, when I am home again and look if I will get faster results.
thanks for the hint

sober · Post by **sober** » Tue Nov 28, 2006 5:08 pm

I am using Code::Blocks both in Linux and Windows.
Both are compiling the Source in Release mode with -s -O3 -fexpensive-optimizations

Still: ~2 seconds for OcTree on Windows, ~20 seconds on linux =(

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Needed 22999ms to create OctTree SceneNode.(1274 nodes, 47433 polys)

As there are some more linuxusers around here, perhaps someone can give me a hint?

stodge · Post by **stodge** » Tue Nov 28, 2006 5:29 pm

Profile your application and the Irrlicht library to see what's taking so long.

sober · Post by **sober** » Tue Nov 28, 2006 7:13 pm

Uh...

In profilemode: 33 seconds in:

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irr::core::array<unsigned short, irr::core::irrAllocator<unsigned short> >::erase(unsigned int, int)

next ist 7seconds:

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irr::core::irrAllocator<unsigned short>::construct(unsigned short*, unsigned short const&)

As far as I understand, the arraystuff takes place in the octtreenode