From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
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To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: 7.1 vs. 7.2 on AIX 5L |
Date: | 2002-01-10 20:08:26 |
Message-ID: | 200201102008.g0AK8Rd11467@candle.pha.pa.us |
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Lists: | pgsql-hackers |
Tom Lane wrote:
> Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp> writes:
> > I have made a new version of pgbench which allows not to update
> > branches and tellers tables, which should significantly reduce the
> > contentions.
>
> I used this version of pgbench in some fresh runs on RedHat's 4-way SMP
> Linux box. I did several test runs under varying conditions (pgbench
> scale 500 or 50, checkpoint_segments/wal_files either default 3/0 or
> 30/5, fsync on or off). I compared current CVS tip (including the
> now-committed lwlock rev 2 patch) to 7.1.3. The results are attached.
> As you can see, current beats 7.1 pretty much across the board on that
> hardware. The reason seems to be revealed by looking at vmstat output.
> Typical "vmstat 5" output for 7.1.3 (here in a 6-client pgbench -N
> run) is
Those are dramatic graphs. Is it the WAL increase that made 7.2 much
faster?
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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