Hi,
On Tuesday 16 January 2007 01:31, Mike Wittman wrote:
> I don't have any experimental data on performance at this point, and I
> don't know that this would be a significant bottleneck. I'm just
> interested to see if anyone has previously considered this approach in
> the event that it does become an issue for me. What I do know is that
> during osg::Referenced creation the CRITICAL_SECTION structure requires
> separate heap allocation of about 56 bytes of memory on 32 bit Windows
> and about 80 bytes on 64 bit Windows, including an allocation of a
> kernel handle, and requires deletion of the same at destruction. An
> atomic count would incur no extra allocation or deletion.
And at least on MSVC and gcc >= 4.1 there are compiler builtin functions to do
atomic counts.
With that knowledge the compiler can probably even optimize successive
ref/unref pairs away under some circumstances ...
Greetings
Mathias
--
Dr. Mathias Fröhlich, science + computing ag, Software Solutions
Hagellocher Weg 71-75, D-72070 Tuebingen, Germany
Phone: +49 7071 9457-268, Fax: +49 7071 9457-511
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