Hi Tugkan, My best guess would that your StateStet and Drawables aren't taking advantage of STATIC DataVariance, if the DataVariance isn't STATIC then the DrawTheadPerContext and CullThreadPerCameraDrawTheadPerContext threading models won't provide any frame overlap and won't provide any improvement in performance.
Another thing to check up on is compiler optimization - make sure it's enabled. Finally have a look at what type of ref counting has been implemented, ideally cmake should have chosen atomic ref counting. Have a look at the include/OpenThreads/Config file for what type of ref counting has been selected. It does sound like you might be stuck using Mutex based ref counting. Robert. On Thu, Dec 4, 2008 at 12:13 PM, Tugkan Calapoglu <[EMAIL PROTECTED]> wrote: > Hi All, > > I have been working on performance issues because after we ported our engine > to OSG2.7.6 we lost some performance. > > In my tests I am using a complex town database which is pretty > representative for our applications. I use osgviewer for the tests. > I tested with several versions of OSG starting from 0.99 and I observe a > gradual degredation of performance from 0.99 to 2.7.6 > > Most notably, the frame rate I get in 2.7.6 with > CullThreadPerCameraDrawThreadPerContex is not any better than one I get from > OSG0.99. Other threading modes give even worse results. > > It is expected that thread syncronization adds some overhead but I was > hoping to get overall better performance from new multithreading models. > > Here are some of my observations: > - From SVN revision 7327 to 7328 a significant loss of cull performance is > observed. I found out that this is due to the addition of > #define OSGUTIL_RENDERBACKEND_USE_REF_PTR > I made some tests and measured following for SingleThreaded case: > in 7327 cull time is ~1.15 > in 7328 cull time is ~1.65 > in 7328 where thread safe ref/unref is turned off cull time is ~1.35 > > - cull time gets even worse from 7328 onward. In latest SVN version I have > 1.95 ms in SingleThreaded mode. I couldn't find yet where the performance > loss occurs. > > - A similar performance loss is observable in draw times but I didn't have > time yet to look closer at it. > > > Did anybody else compared old OSG versions to newer ones? How was your > results? > > > Tugkan > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
