I have added a new subsystem and dialog to monitor FG performance. It's replacing/improving the original code which was only capable of writing statistics data to the console (I guess few people ever used or were even aware of the old option).
The new GUI dialog is available in the menu: "Debug" => "Monitor system performance". Example: http://imageshack.us/photo/my-images/521/fgfsscreen031.png/ * Only statistics on our "subsystems" are shown. That's the FG modules running in our single-threaded main loop. Everything outside the main loop isn't shown, i.e. there are no statistics on the GPU or OSG rendering threads (use the OSG statistics screen for these). * Title bar shows average and worst case frame rate. In a perfect world, all frames should be spaced evenly, so both values should be almost identical. When frames are produced unevenly, then a larger difference between the worst and average frame rate is visible. Needless to say, we should try to get FG to deliver frames evenly, so movements look smooth. * Main table shows statistics on the individual subsystems. Helps to identify how much time certain systems currently consume, or which are responsible for jitters resulting in uneven frame rates. * A bit background on the FG subsystems may be necessary though to really judge what's going on. For example, you'll see the "nasal" subsystem consuming almost no time at all, so it looks great. However, almost all the nasal code runs in timers, and timers are driven by the "events" subsystem. So, to judge Nasal performance, you'll mainly need to look at "events" (and yes, you'll see time being consumed and jitters being produced there). * Statistics data is only collected while the dialog is open (or you manually set /sim/performance-monitor/enabled). Anyway, this alone isn't improving anything yet, but having a GUI to conveniently monitor performance will hopefully help us to see where exactly we're having issues - and help us to improve... cheers, Thorsten ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-novd2d _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
