Re: 7.1 vs. 7.2 on AIX 5L

Tom Lane wrote:
> Tatsuo Ishii <t-ishii@sra.co.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?

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