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PCP Multi-Archive Contexts: Treatment of Archive Boundaries

To: Ken McDonell <kenj@xxxxxxxxxxxxxxxx>
Subject: PCP Multi-Archive Contexts: Treatment of Archive Boundaries
From: Dave Brolley <brolley@xxxxxxxxxx>
Date: Wed, 18 Nov 2015 13:57:14 -0500
Cc: PCP Mailing List <pcp@xxxxxxxxxxx>
Delivered-to: pcp@xxxxxxxxxxx
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Hi Ken (and All),

You may have seen the recent discussion regarding scaling, consistency and support for dynamic behaviour within directories of archives. The topic of how to treat archive boundaries with respect to scaling came up as part of the discussion of whether and how to handle new archives which may appear in the middle of the overall timeline while the context is open.

Currently, the prototype treats archive boundaries as seamless. That is, if we transition from Archive A to B while scaling some counter, the last sample from A and the first same from B will be interpolated as if they came from the same archive.

It has been suggested that the boundary actually represents a break in the logging and that it should be treated as a virtual MARK record. Now that I think about it, I am leaning toward this interpretation, since the boundary does indeed represent a gap during which no logging was performed.

I am interested in your opinion and suggestions for this and also for the discussion re: scaling, consistency and dynamic behaviour.

Thanks,
Dave

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