| From: | "Luke Lonergan" <llonergan(at)greenplum(dot)com> |
|---|---|
| To: | "Skype Technologies OY" <hannu(at)skype(dot)net>, "Martijn van Oosterhout" <kleptog(at)svana(dot)org> |
| Cc: | "Myron Scott" <lister(at)sacadia(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Support Parallel Query Execution in Executor |
| Date: | 2006-04-10 19:02:56 |
| Message-ID: | C05FF9F0.213EB%llonergan@greenplum.com |
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| Lists: | pgsql-hackers pgsql-patches |
Hannu,
On 4/10/06 2:23 AM, "Hannu Krosing" <hannu(at)skype(dot)net> wrote:
>> The cost of fetching a page from the OS is not really much of an
>> overhead,
>
> Have you tested this ?
I have - the overhead of fetching a page from Linux I/O cache to buffer
cache is about an additional 20% over fetching it directly from buffer cache
on PG 7.4.
Haven't tested it on 8.1.
- Luke
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