From: | NikhilS <nikkhils(at)gmail(dot)com> |
---|---|
To: | "Luke Lonergan" <llonergan(at)greenplum(dot)com> |
Cc: | "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: | 2006-10-18 06:05:10 |
Message-ID: | d3c4af540610172305g4c96c335ub322a55c32491ffb@mail.gmail.com |
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Thread: | |
Lists: | pgsql-hackers |
Hi,
"bgwriter doing aysncronous I/O for the dirty buffers that it is supposed to
sync"
Another decent use-case?
Regards,
Nikhils
EnterpriseDB http://www.enterprisedb.com
On 10/15/06, Luke Lonergan <llonergan(at)greenplum(dot)com> wrote:
>
> Martijn,
>
> On 10/15/06 10:56 AM, "Martijn van Oosterhout" <kleptog(at)svana(dot)org> wrote:
>
> > Have enough systems actually got to the point of actually supporting
> > async I/O that it's worth implementing?
>
> I think there are enough high end applications / systems that need it at
> this point.
>
> The killer use-case we've identified is for the scattered I/O associated
> with index + heap scans in Postgres. If we can issue ~5-15 I/Os in
> advance
> when the TIDs are widely separated it has the potential to increase the
> I/O
> speed by the number of disks in the tablespace being scanned. At this
> point, that pattern will only use one disk.
>
> - Luke
>
>
>
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