On Wednesday, April 8, 2009, Josh Berkus <josh@agliodbs.com> wrote:
> On 4/8/09 9:44 AM, Tom Lane wrote:
>
> Josh Berkus<josh@agliodbs.com> writes:
>
> What about seq scans?
>
>
> If the kernel can't read-ahead a seqscan by itself, it's unlikely to
> be smart enough to be helped by posix_fadvise ... or at least so I
> would think. Do you have reason to think differently?
>
>
> Well, Solaris 10 + UFS should be helped by fadvise -- in theory at least, it would eliminate the need to modify your
mountpoints for better readahead when setting up a PG-Solaris server. Solaris-UFS quite lazy about readahead. Zdenek,
Jignesh?
>
> You're probably correct about Linux and FreeBSD. I don't know if OSX + HFS supports fadvise. If so, it could only
help;readahead on HFS right now is nonexistant.
>
> Presumably fadvise is useless on Windows. Anyone know?
It is.
--
Dave Page
EnterpriseDB UK: http://www.enterprisedb.com
