I followed the instructions in the previous email and I was able to get the 2.6.1 API to build with atomic ref counting on my Enterprise Redhat box. This change caused a 33% improvement in my culling time and an 8% improvement in my draw time when in cull thread per context mode. In single threaded mode it made a similar amount of improvement in both cull and draw.
This improvement is definitely nice so thanks for the help, but I am still confused as to how the 1.2 API is still able to perform about %12 - %15 better than 2.6.1 even with atomic ref counting used. Although, I will say that I only see this on certain databases - I have another OpenFlight database that essentially gets the same level of performance on both versions of the API. Has anyone else noticed a difference in performance between 1.2 and 2.6 on any of their old databases? Are there other settings (build or runtime) that I can use to improve performance? Are there different default settings or perhaps increased error catching that was added in 2.X that could account for the difference that I am seeing? Thanks. Alex -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Osfield Sent: Tuesday, February 10, 2009 10:35 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Cull time doubled? On Tue, Feb 10, 2009 at 4:39 PM, Jason Daly <[email protected]> wrote: > On RHEL 5, you have to *explicitly* set CXXFLAGS to "-march=i486" or higher > *before* running CMake. For some reason, the default configuration will > evaluate to using mutexes, even if your CPU supports the GCC builtins. In long hand I think Jason is suggesting something like: // remove the previous CMakeCache.txt to force a full reconfigure rm CMakeCache.txt // set the CXXFLAGS to tell cmake that you plan to use a specific architecture export CXXFLAGS="-march=i686" // call the ./configure script or run cmake . -DCMAKE_BUILD_TYPE=Release that it's equivalent to ./configure // then run the parallel build to use all those loverly cores that modern machines have :-) make -j 4 Could you let us know how you get on with this recipe. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
