pg.ddx.io  pgsql-performance@postgresql.org mailing list archive  

help / color / mirror / Atom feed

From: Brad Nicholson <bnichols@ca.afilias.info>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Greg Smith <greg@2ndquadrant.com>
Cc: André Volpato <andre.volpato@ecomtecnologia.com.br>
Cc: pgsql-performance@postgresql.org
Subject: Re: AIX slow buffer reads
Date: Wed, 27 Oct 2010 18:37:23 -0400
Message-ID: <4CC8A9A3.7060901@ca.afilias.info> (raw)
In-Reply-To: <26542.1288210215@sss.pgh.pa.us>
References: <1141414014.10692.1288199109474.JavaMail.root@zimbra01a>
	<4CC87C69.5070301@2ndquadrant.com>
	<26542.1288210215@sss.pgh.pa.us>

On 10/27/2010 4:10 PM, Tom Lane wrote:
> Greg Smith<greg@2ndquadrant.com>  writes:
>> André Volpato wrote:
>>> I disabled effective_io_concurrency at AIX but it made no changes on bitmap index times.
>> Brad's point is that it probably doesn't do anything at all on AIX, and
>> is already disabled accordingly.
> AFAICT from googling, AIX does have posix_fadvise, though maybe it
> doesn't do anything useful ...
>
> 			regards, tom lane

If there is an easy way to check if it does do anything useful?  If so, 
I can check it out.

-- 
Brad Nicholson  416-673-4106
Database Administrator, Afilias Canada Corp.

view thread (13+ messages)  latest in thread

Message-ID: <4CC8A9A3.7060901@ca.afilias.info>
Permalink:  ../4CC8A9A3.7060901@ca.afilias.info/
Also on:    postgresql.org/message-id/4CC8A9A3.7060901@ca.afilias.info

copy link · copy postgr.es

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-performance@postgresql.org
  Cc: bnichols@ca.afilias.info, tgl@sss.pgh.pa.us, greg@2ndquadrant.com, andre.volpato@ecomtecnologia.com.br
  Subject: Re: AIX slow buffer reads
  In-Reply-To: <4CC8A9A3.7060901@ca.afilias.info>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox