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 20:57:03 |
Message-ID: | 200209262057.g8QKv3Z22867@candle.pha.pa.us |
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Lists: | pgsql-general pgsql-hackers pgsql-performance |
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.
>
> > Also, though ext3 is slower, turning fsync off should make ext3 function
> > similar to ext2.
>
> Why would that be?
OK, I changed the text to:
File system choice is particularly difficult on Linux because there are
so many file system choices, and none of them are optimal: ext2 is not
entirely crash-safe, ext3, xfs, and jfs are journal-based, and Reiser is
optimized for small files and does journalling. The journalling file
systems can be significantly slower than ext2 but when crash recovery is
required, ext2 isn't an option.
--
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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