From: Tom Lane <tgl@sss.pgh.pa.us>
To: Gregory Stark <stark@enterprisedb.com>
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: Fri, 13 Mar 2009 22:06:16 -0400
Message-ID: <26666.1236996376@sss.pgh.pa.us> (raw)
In-Reply-To: <87d4ck50h1.fsf@oxford.xeocode.com>
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>
<87d4ck50h1.fsf@oxford.xeocode.com>
Gregory Stark <stark@enterprisedb.com> writes:
> Tom Lane <tgl@sss.pgh.pa.us> writes:
>> 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 assume you meant effective_io_concurrency. We'd still need a special
case because the default is currently hard-wired at 1, not 0, if
configure thinks the function exists. Also there's a posix_fadvise call
in xlog.c that that parameter doesn't control anyhow.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, stark@enterprisedb.com, 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: <26666.1236996376@sss.pgh.pa.us>
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