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Re: Streaming replication on win32, still broken

From: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
To: Magnus Hagander <magnus(at)hagander(dot)net>
Cc: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Streaming replication on win32, still broken
Date: 2010-02-18 10:04:56
Message-ID: 4B7D10C8.5000301@enterprisedb.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Magnus Hagander wrote:
> O_DIRECT helps us when we're not going to read the file again, because
> we don't waste cache on it. If we are, which is the case here, it
> should be really bad for performance, since we actually have to do a
> physical read.
> 
> Incidentally, that should also apply to general WAL when archive_mdoe
> is on. Do we optimize for that?

Hmm, no we don't. We do take that into account so that we refrain from
issuing posix_fadvice(DONTNEED) if archive_mode is on, but we don't
disable O_DIRECT. Maybe we should..

-- 
  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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