Durk > Sent: 24 October 2007 07:22 > To: FlightGear developers discussions > Subject: Re: [Flightgear-devel] FlightGear/Plib periodic stutter notes > > > On Wednesday 24 October 2007 00:15, Vivian Meazza wrote: > > > > > Not here, I'm afraid. Very good frame rates using the > Buccaneer (70+) > > but there are still noticeable pauses over land. None over > the ocean > > tiles. The pauses, or hesitations do not seem to be associated with > > any Subsystem Timing Alert, of which there are almost none. > > > > Hmmm, I didn't say that FlightGear is completely pause free > now. I did say > that the mysterious interval pauses are gone. These are the > pauses that > become increasingly longer and longer over time (up to the > point of several > seconds, or even minutes). The interval pauses are not > affected by terrain > type or whatever, and originate because the nasal memory > footprint keeps > growing and growing. > > >From the sound of it, you're experiencing model loading > pauses (either > >caused > by Multiplayer / AI, of the tile loader). Most likely, the > pauses you see > correspond to pauses coming from the terrain loader (since they don't > correspond to Subsystem activity). > > To verify, place a debug statement in > simgear/scene/model/model.cxx, line 462, > or thereabouts. Something like: > > SG_LOG(SG_GENERAL, SG_INFO, " Requesting model " << path); > > and see if that message corresponds to the pauses you see. > > Its obvious that eventually we need to address these pauses > too. This may take > a bit longer, because it requires redesigning. In plib we're > actually hitting > a design limitation, but in OSG it should be possible. > > Having said that, addressing the model loading pauses isn't > nearly as > daunting, because the problem is well understood. This is > stark contrast with > the interval pausing, where none of us really had a good idea > what was going > on, until about a week ago or so. >
Thanks for clearing that up: yes, we do seem to have cleared a significant bug. Your analysis of the problem seems plausible. I'll try the debug statement later today. Vivian ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
