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pmchart + Some Archives == Sloooooow

To: pcp@xxxxxxxxxxx
Subject: pmchart + Some Archives == Sloooooow
From: Paul Smith <psmith@xxxxxxxxxx>
Date: Tue, 6 Jan 2015 09:22:20 +1100
Delivered-to: pcp@xxxxxxxxxxx
From time to time I run into a PCP archive with even the latest pmchart where 
scrolling through time seems to make pmchart go into CPU hell.  Discussion on 
IRC with nathan helped me track down that it is the Load Avg part of the 
Overview view that is part of the root cause, something to do with discrete 
metrics and hinv.ncpu.  If I use the vanilla load average view by itself, it 
works fine.  

09:01 nathans: it'd be good to send a note to the list if you could paul?  this 
is libpcp interp.c territory & kenj might have some additional insights

I have an archive that exhibits this I can share if it helps, or I can raise a 
bugzilla ticket etc.. ?

cheers,

Paul
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