Re: [HACKERS] Performance while loading data and indexing

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Neil Conway <neilc(at)samurai(dot)com>
Cc: shridhar_daithankar(at)persistent(dot)co(dot)in, pgsql-hackers(at)postgresql(dot)org, pgsql-general(at)postgresql(dot)org
Subject: Re: [HACKERS] Performance while loading data and indexing
Date: 2002-09-26 20:45:54
Message-ID: 200209262045.g8QKjtv21744@candle.pha.pa.us
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Neil Conway wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > The paper does recommend ext3, but the differences between file systems
> > are very small.
>
> Well, I only did a very rough benchmark (a few runs of pgbench), but
> the results I found were drastically different: ext2 was significantly
> faster (~50%) than ext3-writeback, which was in turn significantly
> faster (~25%) than ext3-ordered.

Wow. That leaves no good Linux file system alternatives. PostgreSQL
just wants an ordinary file system that has reliable recovery from a
crash.

> > Also, though ext3 is slower, turning fsync off should make ext3 function
> > similar to ext2.
>
> Why would that be?

I assumed it was the double fsync for the normal and journal that made
the journalling file systems slog.

--
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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