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Re: Free WAL caches on switching segments

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: ITAGAKI Takahiro <itagaki(dot)takahiro(at)lab(dot)ntt(dot)co(dot)jp>
Cc: pgsql-patches(at)postgresql(dot)org
Subject: Re: Free WAL caches on switching segments
Date: 2006-02-13 02:49:30
Message-ID: 200602130249.k1D2nUe07718@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-patches
ITAGAKI Takahiro wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> wrote:
> 
> > I looked this over and I am unsure what this does for us that isn't
> > already accomplished using the wal_sync_method settings.  See xlog.c for
> > a description of O_DIRECT and when it is used.
> 
> I proposed it to supplement the cache control. There are some OSes that
> supports posix_fadvise but not O_DIRECT, for example, NetBSD 4.0
> (http://www.netbsd.org/Changes/changes-4.0.html).

Oh, that makes sense then.   Let me re-add it to the queue.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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