HI All, I've been testing my newly built Intel Core i7/X58/Kubuntu 8.10 system and found that OSG performance was around 1/3rd of what I expected, and have traced the cause of this down to the cmake-2.6.0 (2.6 patch 0) that I installed from the Ubuntu repositories. The specific problem is that Cmake is defaulting to a blank entry for CMAKE_CXX_FLAGS_RELEASE, something that normally reads "-O3 -DNDEBUG", to see the value run ccmake . and then press 't' to get the advanced options.
Manually setting CMAKE_CXX_FLAGS_RELEASE to -O3 -DNDEBUG fixed the performance problem with the Release build. I have also pulled down cmake 2.6.2 from the cmake website, built and installed it and this version of Cmake sets up the expect value for CMAKE_CXX_FLAGS_RELEASE so they have fixed this bug. I don't know whether this bug is just specific to my process architecture, or whether its just an issue with the Ubuntu repositories version of CMake 2.6.0, but there is a good chance that the problem affects more platforms and Cmake versions. Could users check their CMAKE_CXX_FLAGS_RELEASE value and report this value along with cmake version, source of your cmake version and platform details. Once we have a pattern of what is cmake versions/platforms this problem we can post an advisory on the wiki, and perhaps see if we can get the repositories updated. Thanks, Robert. _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
