Re: odd iostat graph - Mailing list pgsql-performance

From Greg Smith
Subject Re: odd iostat graph
Date
Msg-id alpine.GSO.2.01.0909111619450.1470@westnet.com
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In response to odd iostat graph  (Alan McKay <alan.mckay@gmail.com>)
Responses Re: odd iostat graph
List pgsql-performance
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@gregsmith.com http://www.gregsmith.com Baltimore, MD

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