From: Jonah H. Harris <jonah.harris@gmail.com>
To: Greg Smith <gsmith@gregsmith.com>
Cc: pgsql-docs@postgresql.org
Cc: pgsql-hackers@postgresql.org
Subject: Re: [DOCS] "distributed checkpoint"
Date: Fri, 7 Dec 2007 22:50:24 -0500
Message-ID: <36e682920712071950x522646edub34cab934aa4396e@mail.gmail.com> (raw)
In-Reply-To: <Pine.GSO.4.64.0712072138270.10014@westnet.com>
References: <20071206220348.GM8451@alvh.no-ip.org>
<5958.1196991889@sss.pgh.pa.us>
<20071206191944.1d7926d2@commandprompt.com>
<20071207034328.GB18310@fetter.org>
<1197051730.4255.603.camel@ebony.site>
<Pine.GSO.4.64.0712072138270.10014@westnet.com>
On Dec 7, 2007 10:25 PM, Greg Smith <gsmith@gregsmith.com> wrote:
> > "Smoothed" makes a lot of sense for me. We used to have a checkpoint
> > spike, now we don't.
>
> To be accurate, there used to be a huge and unavoidable spike, now there's
> a control that aims to make it smaller. The problem hasn't completely
> gone away yet.
Agreed.
> "Distributed checkpoints prevent I/O spikes during checkpoints"
>
> It's good this came up, because that is factually wrong;
Agreed.
> "Checkpoint writes can be spread over a longer time period to smooth the
> I/O spike during each checkpoint"
Sounds good to me.
> It's got spread, it's got smooth, and if I could have worked "silky" in
> there too I would have.
:)
--
Jonah H. Harris, Sr. Software Architect | phone: 732.331.1324
EnterpriseDB Corporation | fax: 732.331.1301
499 Thornall Street, 2nd Floor | jonah.harris@enterprisedb.com
Edison, NJ 08837 | http://www.enterprisedb.com/
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To: pgsql-docs@postgresql.org
Cc: jonah.harris@gmail.com, gsmith@gregsmith.com, pgsql-hackers@postgresql.org
Subject: Re: [DOCS] "distributed checkpoint"
In-Reply-To: <36e682920712071950x522646edub34cab934aa4396e@mail.gmail.com>
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