| 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 |
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| 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
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