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[Bug 1136] pmlogreduce type conversion conflicts with naive multi-archiv

To: pcp@xxxxxxxxxxx
Subject: [Bug 1136] pmlogreduce type conversion conflicts with naive multi-archive same-type assertion
From: bugzilla-daemon@xxxxxxxxxxx
Date: Thu, 11 Feb 2016 02:19:34 +0000
Auto-submitted: auto-generated
Delivered-to: pcp@xxxxxxxxxxx
In-reply-to: <bug-1136-835@xxxxxxxxxxxxxxxx/bugzilla/>
References: <bug-1136-835@xxxxxxxxxxxxxxxx/bugzilla/>

Comment # 3 on bug 1136 from
(a) yes, the nirvana solution for pmlogreduce would be to convert counter,bytes
-> instant,bytes/sec

(b) we'd need to widen _every_ 64-bit counter for this to be a viable option,
and that just does not feel right

(c) widening was added to pmlogreduce because the longer the time interval that
the archive spans the higher the probability of a counter wrap, and in the
absence of (a) the simplest way to deal with this is to expand 32-bit counters
to 64-bit counters

I would prefer to fix this properly, not Band-Aid the "32-bit counters being
widened to 64-bit counters thanks to pmlogreduce" problem.

Needs some more soak-n-think time at my end ...


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