Re: odd iostat graph

From: Greg Smith <gsmith(at)gregsmith(dot)com>
To: Alan McKay <alan(dot)mckay(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: odd iostat graph
Date: 2009-09-11 20:28:06
Message-ID: alpine.GSO.2.01.0909111619450.1470@westnet.com
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On Fri, 11 Sep 2009, Alan McKay wrote:

> We aren't seeing any performance problems on this per-se. But that
> just seems like a really odd graph to me. Can anyone explain it? In
> particular, how regular it is?

What's the scale on the bottom there? The label says "by week" but the
way your message is written makes me think it's actually a much smaller
time frame. If those valleys are around around five minutes apart, those
are the checkpoints finishing; the shape of the graph is right for it to
be those.

--
* Greg Smith gsmith(at)gregsmith(dot)com http://www.gregsmith.com Baltimore, MD

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