| From: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | Martin Scholes <marty(at)iicolo(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | Re: WAL Bypass for indexes |
| Date: | 2006-04-05 18:00:34 |
| Message-ID: | 1144260034.13549.730.camel@localhost.localdomain |
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| Lists: | pgsql-hackers |
On Wed, 2006-04-05 at 09:40 -0700, Martin Scholes wrote:
> > I will run multiple tests and post the actual numbers.
>
> I did run more extensive tests and did not bother writing down the
> numbers, and here's why: the unmodified Pg ran pgbench with a whopping
> average of 6.3% time in IO wait.
>
> If I was able to totally eliminate that time (which is impossible),
> then the best we could hope for is a 7% increase in performance by
> skipping WAL of indexes.
The WAL becomes more of a hotspot as you scale up numbers of CPUs. I
guess this idea doesn't make much difference for smaller systems.
I think your idea still has merit, Martin. I'll do some tests also.
Best Regards, Simon Riggs
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