On Feb 25, 2005, at 11:25 AM, Andrew Johnson wrote:
Responding to these comments in the order they were made:
Ralph Lange wrote:
Does this imply that IOC load is evenly distributed? I.e. that
records with the same scanPeriod period are processed in a "spread
over time" manner rather than "en bloc" as in V3?
I suspect that's how it would behave, although I'm not 100% sure how
we should be measuring the delay period - presumably measured from the
start time of the previous record processing (i.e. we'd add another
timestamp field in dbCommon to record the start of processing time,
although we could just start the processing delay time from the *end*
of the previous processing). If we do it that way then records of the
same period would get spread out over time by the delays between their
timer going off and actually getting processed.
I'd like to register a strong objection to this since it means that the
'sampling rate' of periodic record processing is no longer
deterministic. I think that it is much more important that the
long-term average rate of periodic record processing match the
specified rate.
--
Eric Norum <[email protected]>
Advanced Photon Source
Argonne National Laboratory
(630) 252-4793
- References:
- Re: EPICS base V4: iocCore database Marty Kraimer
- Re: EPICS base V4: iocCore database Andrew Johnson
- Re: EPICS base V4: iocCore database: Booleans Benjamin Franksen
- EPICS base V4 Marty Kraimer
- Re: EPICS base V4 Andrew Johnson
- Re: EPICS base V4 Ralph Lange
- Re: EPICS base V4 Andrew Johnson
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