From: Gregory Stark <stark@enterprisedb.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Alan Stange <stange@rentec.com>
Cc: Jignesh K. Shah <J.K.Shah@Sun.COM>
Cc: Greg Smith <gsmith@gregsmith.com>
Cc: pgsql-performance\@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: 8.4 Performance improvements: was Re: Proposal of tunable fix for scalability of 8.4
Date: Sat, 14 Mar 2009 01:58:50 +0000
Message-ID: <87d4ck50h1.fsf@oxford.xeocode.com> (raw)
In-Reply-To: <12431.1236965004@sss.pgh.pa.us>
References: <C5DDBB25.3333%scott@richrelevance.com>
<49B922C0.6050700@sun.com>
<alpine.GSO.2.01.0903121613270.1925@westnet.com>
<49BA5537.8060002@sun.com>
<87prgl4jbh.fsf@oxford.xeocode.com>
<49BA79A4.9030208@rentec.com>
<12431.1236965004@sss.pgh.pa.us>
Tom Lane <tgl@sss.pgh.pa.us> writes:
> Alan Stange <stange@rentec.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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To: pgsql-performance@postgresql.org
Cc: stark@enterprisedb.com, tgl@sss.pgh.pa.us, stange@rentec.com, J.K.Shah@Sun.COM, gsmith@gregsmith.com
Subject: Re: 8.4 Performance improvements: was Re: Proposal of tunable fix for scalability of 8.4
In-Reply-To: <87d4ck50h1.fsf@oxford.xeocode.com>
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