Re: Assessing stress in Performer

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Sharon Clay (src++at++rose.engr.sgi.com)
Thu, 17 Jul 1997 21:48:07 -0700

+>---- On Jul 17, 3:19pm, Jillian Michelle Tidd wrote:
> Subject: Assessing stress in Performer
->From guest++at++holodeck.csd.sgi.com Thu Jul 17 21:22:35 1997
->From: Jillian Michelle Tidd <jmtidd++at++cs.uiowa.edu>
->Subject: Assessing stress in Performer
->To: info-performer++at++sgi.com
->Date: Thu, 17 Jul 1997 15:19:43 -0500 (CDT)
->X-Mailer: ELM [version 2.4 PL25]
->
->hello,
-> I am looking for a way to assess stress in Performer. I know that the stats graphics display a wavy red line that indicates when the system is stressed by straying outside of a certain boundary, but I am looking for a better way to quantify this measurement. Is there a variable in pfStats that holds the values used to draw the red line? Any assistance would be appreciated.

pfGetChanLoad() and pfGetChanStress() are the APIs I think you want.
That wavy red line is actually load which
is evaluated on a per-channel basis based on the goal frame rate and
the amount of frame time a channel is supposed to consume as per
pfChanStressFilter().
Stress is defined as being under or overloaded which is when the load is
above or below the min/max lines set by pfChanStressFilter().
If you enable stress (can do it in the perfly GUI) you'll see that
the stats then show the stress as a white line and print the
current stress value.

src.

-- 
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Sharon Rose Clay (Fischler) - Silicon Graphics, Advanced Systems Dev.
src++at++sgi.com  (415) 933 - 1002  FAX: (415) 965 - 2658  MS 8U-590
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