| From: | Gregory Stark <stark(at)enterprisedb(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Alan Stange <stange(at)rentec(dot)com>, "Jignesh K(dot) Shah" <J(dot)K(dot)Shah(at)Sun(dot)COM>, Greg Smith <gsmith(at)gregsmith(dot)com>, "pgsql-performance\(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: 8.4 Performance improvements: was Re: Proposal of tunable fix for scalability of 8.4 |
| Date: | 2009-03-14 01:58:50 |
| Message-ID: | 87d4ck50h1.fsf@oxford.xeocode.com |
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| Lists: | pgsql-performance |
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
> Alan Stange <stange(at)rentec(dot)com> writes:
>> Gregory Stark wrote:
>>> AFAIK Opensolaris doesn't implement posix_fadvise() so there's no benefit.
>
>> It's implemented. I'm guessing it's not what you want to see though:
>> http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/port/gen/posix_fadvise.c
>
> Ugh. So apparently, we actually need to special-case Solaris to not
> believe that posix_fadvise works, or we'll waste cycles uselessly
> calling a do-nothing function. Thanks, Sun.
Do we? Or do we just document that setting effective_cache_size on Solaris
won't help?
I'm leaning towards the latter because I expect Sun will implement this and
there will be people running 8.4 on newer versions of the OS long after it's
out.
--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
Ask me about EnterpriseDB's 24x7 Postgres support!
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