Hey Robert, I took a look at this and I think Remo is right. Basically the issue is that if you do anything that forces the osgDB library to be loaded before you have a chance to set your desired settings in osg::DisplaySettings then they won't take effect b/c the prototype DatabasePager is created here on library load: https://github.com/openscenegraph/OpenSceneGraph/blob/10d8ac7f65b177a3a92a28e2f976413c9c641489/src/osgDB/DatabasePager.cpp#L1243
So if you happen to do what Remo is doing by using osgDB to get the number of processors, your DisplaySettings won't take effect b/c the prototype pager has already been created. I've been bit by this a few times as well, so it's something worth looking at. It's also a hard problem to track down b/c it just usually manifests itself as "Why is osgearth slow in my app but not in osgviewer" Perhaps the answer is to create the prototype on demand instead of on library load? Jason On Sun, Apr 30, 2017 at 12:31 PM Remo Eichenberger <[email protected]> wrote: > Hi Robert > > How one should change the number of threads dynamic before DatabasePager > initialise it in his singleton? > > > Code: > > int cores = Registry::capabilities().getNumProcessors(); > osg::DisplaySettings::instance()->setNumOfDatabaseThreadsHint( > osg::clampAbove(cores, 2) ); > osg::DisplaySettings::instance()->setNumOfHttpDatabaseThreadsHint( > osg::clampAbove(cores/2, 1) ); > > > > > It will not work. It works only with an environment variable. The > singleton should not setup the threads on startup. The constructor of a > singleton is at beginning of application startup. The order of initialise > is not defined (only from the compiler). > > Cheers, > Remo > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=70866#70866 > > > > > > _______________________________________________ > osg-submissions mailing list > [email protected] > > http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org >
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