Re: [Flightgear-devel] [Bug-Report] Stutterer and pauses withdynamic-view
Robert Black Sent: 29 August 2007 03:41 To: FlightGear developers discussions Subject: Re: [Flightgear-devel] [Bug-Report] Stutterer and pauses withdynamic-view On Tuesday 28 August 2007 18:44, Laurence Vanek wrote: also had this problem in general (not with dynamic view). only thing that helped was adding the following to my .fgfsrc file: --prop:/sim/frame-rate-throttle-hz=75 as far I know no one has solved this problem. apparently only a few of us seem to have the issue. I thought everyone had this behavior. Most videos I have seen of FG have the stutter and pause. Robert I certainly do. I suspect that people have given up complaining about it and have come to regard it as normal. At its worst it makes FG almost impossible to use. 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
Re: [Flightgear-devel] [Bug-Report] Stutterer and pauses withdynamic-view
Quoting Vivian Meazza : Robert Black Sent: 29 August 2007 03:41 To: FlightGear developers discussions Subject: Re: [Flightgear-devel] [Bug-Report] Stutterer and pauses withdynamic-view On Tuesday 28 August 2007 18:44, Laurence Vanek wrote: also had this problem in general (not with dynamic view). only thing that helped was adding the following to my .fgfsrc file: --prop:/sim/frame-rate-throttle-hz=75 as far I know no one has solved this problem. apparently only a few of us seem to have the issue. I thought everyone had this behavior. Most videos I have seen of FG have the stutter and pause. Robert I certainly do. I suspect that people have given up complaining about it and have come to regard it as normal. At its worst it makes FG almost impossible to use. I think stutter comes from the threaded scenery tile loader. When you change view direction, you ask the loader to load more tiles, and when all required tiles are loaded for a given position, the stutter stops. Also, when there is an insane frame rate, there should be no CPU time allocated to the tile loader, and thus, the stutter, so limiting the frame rate, either by using the throttling feature, or activating vsync, should lessen the problem. -Fred -- Frédéric Bouvier http://frfoto.free.fr Photo gallery - album photo http://www.fotolia.fr/p/2278/partner/2278 Other photo gallery http://fgsd.sourceforge.net/ FlightGear Scenery Designer - 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
Re: [Flightgear-devel] [Bug-Report] Stutterer and pauses withdynamic-view
Frederic Bouvier wrote: I think stutter comes from the threaded scenery tile loader. When you change view direction, you ask the loader to load more tiles, and when all required tiles are loaded for a given position, the stutter stops. That seems unlikely. The tile loader is very old code, and this is a new symptom. It's also, as you point out, threaded precicely for the purpose of *not* blocking the main rendering thread. Andy - 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
Re: [Flightgear-devel] [Bug-Report] Stutterer and pauses withdynamic-view
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Frederic Bouvier wrote: Quoting Vivian Meazza : Robert Black Sent: 29 August 2007 03:41 To: FlightGear developers discussions Subject: Re: [Flightgear-devel] [Bug-Report] Stutterer and pauses withdynamic-view On Tuesday 28 August 2007 18:44, Laurence Vanek wrote: also had this problem in general (not with dynamic view). only thing that helped was adding the following to my .fgfsrc file: --prop:/sim/frame-rate-throttle-hz=75 I think stutter comes from the threaded scenery tile loader. When you change view direction, you ask the loader to load more tiles, and when all required tiles are loaded for a given position, the stutter stops. Also, when there is an insane frame rate, there should be no CPU time allocated to the tile loader, and thus, the stutter, so limiting the frame rate, either by using the throttling feature, or activating vsync, should lessen the problem. -Fred You can blame some stuttering on the incomplete integration of the tile loader with OSG, something that I'm working on. In particular, display lists are now compiled and textures are now loaded when a tile first becomes visible; the OSG database pager schedules this work over several frames to avoid affecting the frame rate. Also, it's true that activating vsync will leave some predictable time for the pager thread to run when it won't interrupt the main rendering thread. Tim -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFG1YtreDhWHdXrDRURArtXAJ9iZaxcutfB33/geBAr8jjXn+7AygCfZq4G nY9J867TOdCadCHKVMCrZH8= =KsQG -END PGP SIGNATURE- - 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
Re: [Flightgear-devel] [Bug-Report] Stutterer and pauses withdynamic-view
Quoting Tim Moore [EMAIL PROTECTED]:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Frederic Bouvier wrote:
Quoting Vivian Meazza :
Robert Black
Sent: 29 August 2007 03:41
To: FlightGear developers discussions
Subject: Re: [Flightgear-devel] [Bug-Report] Stutterer and
pauses withdynamic-view
On Tuesday 28 August 2007 18:44, Laurence Vanek wrote:
also had this problem in general (not with dynamic view).
only thing
that helped was adding the following to my .fgfsrc file:
--prop:/sim/frame-rate-throttle-hz=75
I think stutter comes from the threaded scenery tile loader. When you
change
view direction, you ask the loader to load more tiles, and when all
required
tiles are loaded for a given position, the stutter stops. Also, when there
is an
insane frame rate, there should be no CPU time allocated to the tile
loader, and
thus, the stutter, so limiting the frame rate, either by using the
throttling
feature, or activating vsync, should lessen the problem.
-Fred
You can blame some stuttering on the incomplete integration of the tile
loader with
OSG, something that I'm working on. In particular, display lists are now
compiled and
textures are now loaded when a tile first becomes visible; the OSG database
pager
schedules this work over several frames to avoid affecting the frame rate.
Also, it's
true that activating vsync will leave some predictable time for the pager
thread to run
when it won't interrupt the main rendering thread.
Did someone experiment changing the number of loader threads ?
This is possible by changing line 120 of Scenery/FGTileLoader.hxx
In CVS, the line is now :
enum { MAX_THREADS = 1 };
It won't cure the fact that OGL resources needs to be allocated in the rendering
thread, but would enable multiple cores to load more than one tile at a time.
-Fred
--
Frédéric Bouvier
http://frfoto.free.fr Photo gallery - album photo
http://www.fotolia.fr/p/2278/partner/2278 Other photo gallery
http://fgsd.sourceforge.net/ FlightGear Scenery Designer
-
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Re: [Flightgear-devel] [Bug-Report] Stutterer and pauses withdynamic-view
On Wednesday 29 August 2007 15:43, Andy Ross wrote: Frederic Bouvier wrote: I think stutter comes from the threaded scenery tile loader. When you change view direction, you ask the loader to load more tiles, and when all required tiles are loaded for a given position, the stutter stops. That seems unlikely. The tile loader is very old code, and this is a new symptom. It's also, as you point out, threaded precicely for the purpose of *not* blocking the main rendering thread. Andy I'm not so sure I'd regard this as a new problem. I first reported it on the 8th Dec 2006 and Melchior responded that he'd been experiencing it for some time before then. At that time, Melchior thought it was related to the AI sub-system. The thread subject was Periodic 'stutter' in FG LeeE - 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
Re: [Flightgear-devel] Simple 3d model request
Hi Josh, Finally had a minute to download and try the model ... it looks great, thanks Should be perfect as is. If you get bored and want to fiddle with it any more, here's a small amount of feedback ... mostly just minor things. 1. The winglets are pretty much 90 degrees to the wing: http://baron.flightgear.org/~curt/UAV/Malolo1/DSC01760.JPG 2. For the actual airplane, I don't think the winglets are tapered quite as much ... you are close, but by my eye there could be just a bit more sweep on the trailing edge of the winglet leaving a bit more chord at the top. The leading edge looks pretty good. If you thought you might have time to fiddle some more, I could get you actual dimensions. http://baron.flightgear.org/~curt/UAV/Malolo1/DSC01756.JPG 3. The protoype has this odd/unfinished color scheme, but the next version will most likely be white on the tops of the wing and both sides of the winglets and natural black carbon fiber cloth on the bottom of the wing. The bottom of the center section may stay it's gross natural kevlar color which you matched pretty well. That's all I can really nitpick, great job, I really appreciate the quick help on this, makes my week! :-) Curt. On 8/27/07, JOSHUA WILSON [EMAIL PROTECTED] wrote: I have a model at http://golffoxtrotsierra.741.com/Malolo1.zip I used some of your photos and the yardstick model in order to make it. Josh - 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 -- Curtis Olson - University of Minnesota - FlightGear Project http://baron.flightgear.org/~curt/ http://www.humanfirst.umn.edu/ http://www.flightgear.org Unique text: 2f585eeea02e2c79d7b1d8c4963bae2d - 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
Re: [Flightgear-devel] [Bug-Report] Stutterer and pauses withdynamic-view
On Wednesday 29 August 2007 17:53, leee wrote: I'm not so sure I'd regard this as a new problem. I first reported it on the 8th Dec 2006 and Melchior responded that he'd been experiencing it for some time before then. At that time, Melchior thought it was related to the AI sub-system. The thread subject was Periodic 'stutter' in FG Speaking of which; there is one part of the AI system that causes some (currently unavoidable) stutter. Models are loaded on demand, and this causes some stutter. Mathias has indicated trying to move the loading process out of the main render thread, or something like that. I'm not sure how much that relates to the issues Tim mentioned in this thread. In addition, there are a few other candidates for causing stutter in the AI system, in particular the route finding algorithm and the traffic separation detection code, because these are requiring peaks in CPU activity. In particular when two aircraft request these functions in succession, there can be peaks of activity. However, having said that, these AI related issues are quite unlikely to cause the observed stutter, for two reasons 1). Heiko's original report in this thread explicitly mentions that he has turned off traffic manager and AI, and 2) I'm also seeing these stutters occur even before the AI traffic system starts loading. Cheers, Durk - 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
