[rrd-users] Slow collection runtimes occurring regularly

[Simon Hobson]

Joshua Keroes wrote:

>Is our theory correct, that the RRD consolidations may be causing
>these long runtimes

It would be logical that each time a "bucket" is completed, then 
additional processing will happen in order to do the necessary 
normalisation and consolidation.

>, and if that's the case, is there a way to evenly
>stagger the consolidations over time so we can better distribute RRD
>update load?

You cannot offset the consolidation times as everything is referenced 
to unix epoch (Midnight 1st Jan 1970). However, if it is just system 
load you are concerned about, can you delay feeding in some update 
values a bit ? As long as you use an explicit timestamp in the update 
statement, then it doesn't matter what actual clock time the update 
is submitted to rrd - as long as you maintain the right sequence of 
updates.

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Simon Hobson

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