[Opensim-dev] Sim and Phys Frames per Second (FPS) Issues

[Michael Emory Cerquoni]

The reason physics and scripting are locked at 11fps is because this is
what the OpenSimulator heartbeat ticks at, the reason it is multiplied is
to satisfy the viewer statistics, I am not sure its possible to have it
report the legitimate numbers without some wierd side effects, but I could
be wrong, you would have to experiment, I suspect though that changing this
could lead to a lot of badness.

On Mon, Mar 2, 2015 at 1:23 PM, Sean M <mondesire.sean at gmail.com> wrote:

> Greetings,
>
> We at the MOSES project have noticed Simulation and Physics frames per
> second (FPS) have a few issues that we are trying to resolve. The issues
> are producing suspicious performance statistics for the analysis of the
> current version of OpenSim that we are running.
>
> First, there is a correction factor (m_reportedFpsCorrectionFactor) that
> the raw SimFPS is multiplied by. The comment in the following line is a bit
> curious because it indicates that the FPS is artificially inflated to "lie"
> about the actual FPS being so low:
>
> OpenSim/Region/Framework/Scenes/SimStatsReporter.cs: Line 317
> // We're going to lie about the FPS because we've been lying since 2008.
> The actual FPS is currently
> // locked at a maximum of 11.  Maybe at some point this can change so that
> we're not lying.
> int reportedFPS = (int)(m_fps * m_reportedFpsCorrectionFactor);
>
> Also, lines 174 and 227 mention the use of this correction factor.
>
> Second, this multiplier also comes into play in the Scene where there is a MinFrameTime,
> which seems to be the minimum reported amount of time to process a frame:
> OpenSim/Region/Framework/Scenes/Scene.cs:Line 723
>
> Both of these variables, the correction factor and MinFrameTime, are
> concerning from a statistics view point as they are generating skewed and
> massaged numbers; therefore, I have a few questions:
>
> 1) Is it commonly known that Sim and Phy FPSs are inflated to maintain the
> "lie"? And if so, will it be corrected to be an accurate reporting of
> processed frames per second?
>
> 2) What exactly are the definitions for OpenSim's Simulation (Sim) FPS,
> Physics (Phy) FPS and a frame (I have found conflicting and vague
> definitions on the wiki)?
>
> 3) What are the known performance consequences of setting the m_reportedFpsCorrectionFactor
> to 1 and MinFrameTime to 0?
>
> Thanks,
> Sean M.
>
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>


-- 
Michael Emory Cerquoni
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