| From: | Gavin Sherry <swm(at)linuxworld(dot)com(dot)au> |
|---|---|
| To: | David Boreham <david_list(at)boreham(dot)org> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: ice-broker scan thread |
| Date: | 2005-11-29 04:14:38 |
| Message-ID: | Pine.LNX.4.58.0511291513260.18370@linuxworld.com.au |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Mon, 28 Nov 2005, David Boreham wrote:
> Gavin Sherry wrote:
>
> > MySQL, Oracle and others implement read-ahead threads to simulate async IO
>
> I always believed that Oracle used async file I/O. Not that I've seen their
> code, but I'm fairly sure they funded the addition of kernel aio to Linux
> a few years back.
That's right.
>
> But....Oracle comes from a time long ago when threads and decent
> filesystems didn't exist, so some of the things they do may not be
> appropriate
> to add to a product that doesn't have them today.
The paper I linked to seemed to suggest that they weren't using async IO
in 9.2 -- which is fairly old. I'm not sure why the authors didn't test
10g.
Gavin
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