Re: patch for new feature: Buffer Cache Hibernation

From: Greg Stark <gsstark(at)mit(dot)edu>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Mitsuru IWASAKI <iwasaki(at)jp(dot)freebsd(dot)org>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: patch for new feature: Buffer Cache Hibernation
Date: 2011-05-04 16:22:37
Message-ID: BANLkTimktbHZfSpvKAfKBCv5jCbOyraHgg@mail.gmail.com
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On Wed, May 4, 2011 at 4:44 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Do you have
> any proof that writing out a few GB of buffers and then reading them
> back in is actually much cheaper than letting the database re-read the
> data from the disk files?

I believe he's just writing out the meta data. Ie, which blocks to
re-reread from the disk files.

--
greg

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