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

help / color / mirror / Atom feed
From: Michael Stone <mstone+postgres@mathom.us>
To: pgsql-performance@postgresql.org
Subject: Re: Vacuums on large busy databases
Date: Thu, 14 Sep 2006 21:04:32 -0400
Message-ID: <20060915010429.GP6030@mathom.us> (raw)
In-Reply-To: <1158281522.29889.200.camel@dogma.v10.wvs>
References: <cone.1158247381.60704.30981.1000@zoraida.natserv.net>
	<56FA8838-6DEA-4505-990D-85D5EDA26243@fastcrypt.com>
	<cone.1158255415.91768.31944.1000@zoraida.natserv.net>
	<470FED70-B3BA-4B6C-A6B1-DFD8882746B2@fastcrypt.com>
	<cone.1158265846.124028.75607.5001@35st-server.simplicato.com>
	<20060914204220.GL6030@mathom.us>
	<cone.1158278679.769031.75607.5001@35st-server.simplicato.com>
	<1158281522.29889.200.camel@dogma.v10.wvs>

On Thu, Sep 14, 2006 at 05:52:02PM -0700, Jeff Davis wrote:
>Any long-running system will have very little "free" memory. Free memory
>is wasted memory, so the OS finds some use for it.

The important part of the output of "free" in this context isn't how 
much is free, it's how much is cache vs how much is allocated to 
programs. Other os's have other ways of telling the same thing. Neither 
of those numbers generally has much to do with how much shows up in ps 
when large amounts of shared memory are in use.

Mike Stone



view thread (23+ messages)  latest in thread

Message-ID: <20060915010429.GP6030@mathom.us>
Permalink:  ../20060915010429.GP6030@mathom.us/
Also on:    postgresql.org/message-id/20060915010429.GP6030@mathom.us

 · 

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: mstone+postgres@mathom.us
  Subject: Re: Vacuums on large busy databases
  In-Reply-To: <20060915010429.GP6030@mathom.us>

* 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