Re: Closing some 8.4 open items

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