Re: [Paracomp-devel] Crash in pcSystemFinalize

[Shree K. <shr...@hp...>]

Hi Stefan

On Mon, 2008-04-28 at 14:27 +0000, Stefan Eilemann wrote:
> Me again,
> 
> With the simple compositing test in Equalizer I now get a segmentation
> fault in pcSystemFinalize:
...
> 
> OS: Ubuntu 6.10
> HW: Opteron 248
> 

Can you do a build with "release=0" (to enable debug symbols) and post
the stack trace ? That would help me a bit.

> 
> I also get similar, disappointing performance results as on my Mac:
> 
> PC: 15 images: 11.431 ms (1601.83 MB/s)
> Eq: 15 images: 9.207 ms (1988.76 MB/s)

I think the slower code is primarily a difference in compiler
optimization behaviour. I haven't found a good solution for this right
now. 

The following approach looks like a sufficient workaround -- I'll make a
special case for the pixel formats you are using (Currently this is
going through some template expansion and I don't know why the
performance is different. Once the format is special cased the results
will match - because they are basically the same code :-)

I'll do this tomorrow and update you.

> Do I have to configure something in order to use the opteron 'plugin'?
> 
That's not needed for depth compositing, since there is no special code.
For alpha blending, it will get used automatically (provided it's found
in PC_LIBRARY_PATH/composite).

HTH
-- Shree