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Howto:Use the system monitor: Difference between revisions
Disabled some "Caution" text that i think was distracting from the main content.
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== The system monitor == | == The system monitor == | ||
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[[File:System-performance-monitor-fg260.png|400px|thumb|Screen shot showing the system performance monitor available in FG 2.6.0+]] | [[File:System-performance-monitor-fg260.png|400px|thumb|Screen shot showing the system performance monitor available in FG 2.6.0+]] | ||
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In FlightGear >= 2.6.0, use the menu option '''Debug''' => '''Monitor System Performance''' to analyze stutters. | In FlightGear >= 2.6.0, use the menu option '''Debug''' => '''Monitor System Performance''' to analyze stutters. | ||
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So, frame spacing is a much better property to judge visual quality than just watching fps. | So, frame spacing is a much better property to judge visual quality than just watching fps. | ||
* 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). | * 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). | ||
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In short: if the framerate '''varies along with the Frame Delay''', then it's a graphics performance issue. If framerate is pretty stable, and Frame Delay '''varies more or less wildly''' I'd suspect some other subsystem being the culprit and causing more or less periodic delays as it needs to do it's stuff. | In short: if the framerate '''varies along with the Frame Delay''', then it's a graphics performance issue. If framerate is pretty stable, and Frame Delay '''varies more or less wildly''' I'd suspect some other subsystem being the culprit and causing more or less periodic delays as it needs to do it's stuff. | ||
== Profiling == | |||
For developers, and people building from source, FlightGear versions >= 2.9 provide real profiling support using Google PerfTools, for details please see [[Built-in Profiler]]. | |||
= Interpreting the OSG on screen stats = | = Interpreting the OSG on screen stats = | ||