From: Joshua D. Drake <jd@commandprompt.com>
To: Greg Smith <gsmith@gregsmith.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: random_page_costs - are defaults of 4.0 realistic for SCSI RAID 1
Date: Tue, 11 Sep 2007 17:46:09 -0700
Message-ID: <46E736D1.6090103@commandprompt.com> (raw)
In-Reply-To: <Pine.GSO.4.64.0709112005300.28383@westnet.com>
References: <C30B1716.4236C%llonergan@greenplum.com>
<87lkbdlkxw.fsf@oxford.xeocode.com>
<46E676D6.70807@verizon.net>
<87zlzt9ifw.fsf@oxford.xeocode.com>
<46E6E338.5050403@verizon.net>
<20070911213105.GF38801@decibel.org>
<87r6l4ajqh.fsf@oxford.xeocode.com>
<Pine.GSO.4.64.0709112005300.28383@westnet.com>
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Greg Smith wrote:
> On Wed, 12 Sep 2007, Gregory Stark wrote:
>
>> Also, it helps to run a "vmstat 1" in another window and watch the bi
>> and bo
>> columns.
>
> Recently on Linux systems I've been using dstat (
> http://dag.wieers.com/home-made/dstat/ ) for live monitoring in this
> sort of situation. Once you get the command line parameters right, you
> can get data for each of the major disks on your system that keep the
> columns human readable (like switching from KB/s to MB/s as appropriate)
> as activity goes up and down combined with the standard vmstat data.
>
> I still use vmstat/iostat if I want to archive or parse the data, but if
> I'm watching it I always use dstat now.
Thanks for the tip Greg... I hadn't heard of dstat.
Sincerely,
Joshua D. Drake
>
> --
> * Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend
>
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To: pgsql-performance@postgresql.org
Cc: jd@commandprompt.com, gsmith@gregsmith.com
Subject: Re: random_page_costs - are defaults of 4.0 realistic for SCSI RAID 1
In-Reply-To: <46E736D1.6090103@commandprompt.com>
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