Re: HOT pgbench results

On 8/14/07, ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> wrote:
> Heikki Linnakangas <heikki(at)enterprisedb(dot)com> wrote:
>
> > I ran some CPU intensive pgbench tests on HOT. Results are not
> > surprising, HOT makes practically no difference on the total transaction
> > rate, but reduces the need to vacuum:
> >
> > unpatched HOT
> > tps 3680 3790
> > WAL written(MB) 5386 4804
> > checkpoints 10 9
> > autovacuums 116 43
> > autoanalyzes 139 60
>
> I also ran pgbench with/without HOT using a bit different configurations
> (pgbench -s10 -c10 -t500000). There were 10% performance win on HOT,
> although the test was CPU intensive and with FILLFACTOR=100%.

I'm curious why I am seeing results so different from everybody else
(I had almost double tps with HOT). Are you running fsync on/off?
Any other changes to postgresql.conf?

merlin