| From: | "Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> |
|---|---|
| To: | "Simon Riggs" <simon(at)2ndquadrant(dot)com>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: 8.2 is 30% better in pgbench than 8.3 |
| Date: | 2007-07-23 16:34:05 |
| Message-ID: | 2e78013d0707230934y629a2aeerdae4315cb3424947@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 7/23/07, Alvaro Herrera <alvherre(at)commandprompt(dot)com> wrote:
>
>
>
> Certainly it doesn't prevent starvation completely -- really there is no
> way to completely prevent starvation unless you have as many workers as
> you have tables, and one disk for each. What DSM does do is let the big
> tables be vacuumed quickly which makes most of the problem go away.
>
>
>
Frankly I haven't seen DSM results very closely, but DSM can help
us avoid full heap scans (and thats a big thing!), but it can't avoid the
associated index scans and that might limit our ability to vacuum very
large tables frequently.
Thanks,
Pavan
--
Pavan Deolasee
EnterpriseDB http://www.enterprisedb.com
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