pfStats - missing time? (more info)

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Simon Gibbs (Simon.Gibbs++at++gmd.de)
Wed, 15 May 1996 08:29:04 +0200 (MDT)

>
> I have a simple Performer 2.0 application which includes:
> pfMultiprocess(PFMP_APPCULLDRAW);
> pfPhase(PFPHASE_LOCK);
> pfFrameRate(50.0f);
>
> I'm using the default statistics display. In the line:
>
> frame=17.5 app=0.3 cull=0.0 draw=6.9
>
> What is the meaning of the frame time (and why isn't it
> the sum of app/cull/draw)?
>

I should have added that the application is running:
        - setmon 1280x1024_50f (genlocked to an external video sync)
        - on a 4 cpu Onyx / RE2, IRIX 5.3
        - locked down on one cpu

The swapbuffer period should be exactly 20 msec, so what is 17.5?
(I've tried the same program on a second Onyx, identical
configuration, and get about the same numbers.)

Simon Gibbs
GMD

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