| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | John Hansen <john(at)geeknet(dot)com(dot)au> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Gavin Sherry <swm(at)linuxworld(dot)com(dot)au>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Bgwriter behavior |
| Date: | 2004-12-28 22:07:12 |
| Message-ID: | 200412282207.iBSM7Ce16200@candle.pha.pa.us |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-patches |
John Hansen wrote:
> > > > I ran some tests last week and can report results similar on Tom's test:
> > > >
> > > > pgbench -i -s 10 bench
> > > > pgbench -c 10 -t 10000 bench
> > > >
>
> don't you have to specify the scaling factor for the benchmark as well?
> as in pgbench -c 10 -t 10000 -s 10 bench ?
>
> > I just tried and got 115tps with fsync off vs 100 with fsync on, so
> > fsync is certainly doing something.
>
> well, I usually get results that differ by that much from run to run.
> Probably you ran in to more checkpoints on the second test.
>
> Also, did you reinitialize the bench database with pgbench -i ?
I destroyed the database and recreated it.
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Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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