graphite-dev team mailing list archive

Thread
Date

[Question #220485]: carbon-cache number of cached points is very cyclical

To: graphite-dev@xxxxxxxxxxxxxxxxxxx
From: Nelson Elhage <question220485@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 29 Jan 2013 19:20:58 -0000
Reply-to: question220485@xxxxxxxxxxxxxxxxxxxxx
Sender: bounces@xxxxxxxxxxxxx

New question #220485 on Graphite:
https://answers.launchpad.net/graphite/+question/220485

A graph of carbon.agents.*.cache.size shows that the number of cached points is *very* cyclical, with a period of around 2 hours: 
https://nelhage.com/files/stripe-carbon-cache.png

Cross-referencing with munin graphs shows that disk write activity does seem to spike for brief intervals on the same period, suggesting that carbon cache is basically just accumulating data points and then writing them out in bursts. Is this normal? It seems like we can't be nearly utilizing our disk fully with that kind of behavior. Is there something I can tune to make it smooth the disk usage?



-- 
You received this question notification because you are a member of
graphite-dev, which is an answer contact for Graphite.