| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Zeugswetter Andreas ADI SD <ZeugswetterA(at)spardat(dot)at> |
| Cc: | Bruno Wolff III <bruno(at)wolff(dot)to>, Neil Conway <neilc(at)samurai(dot)com>, Martijn van Oosterhout <kleptog(at)svana(dot)org>, Raja Agrawal <raja(dot)agrawal(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Asynchronous I/O Support |
| Date: | 2006-10-20 12:47:28 |
| Message-ID: | 20061020124728.GB27869@alvh.no-ip.org |
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| Lists: | pgsql-hackers |
Zeugswetter Andreas ADI SD wrote:
> > An improvement is going into 2.6.19 to handle asynchronous
> > vector reads and writes. This was covered by Linux Weekly
> > News a couple of weeks ago:
> > http://lwn.net/Articles/201682/
>
> That is orthogonal. We don't really need vector io so much, since we
> rely on OS readahead. We want asyc IO to tell the OS earlier, that we
> will need these random pages, and continue our work in the meantime.
Of course, you can use asynchronous vector write with a single entry in
the vector if you want to perform an asynchronous write.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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