From: Kevin Grittner <Kevin.Grittner@wicourts.gov>
To: Scott Carey <scott@richrelevance.com>
Cc: gryzman@gmail.com
Cc: Andrej <andrej.groups@gmail.com
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Cc: Jeff <threshar@torgo.978.org>
Subject: Re: random_page_cost vs ssd?
Date: Wed, 11 Mar 2009 14:40:44 -0500
Message-ID: <49B7CD6B.EE98.0025.0@wicourts.gov> (raw)
In-Reply-To: <C5DD5F07.32E1%scott@richrelevance.com>
References: <b35603930903111204l6825f931kf67183f7c48971fe@mail.gmail.com>
<C5DD5F07.32E1%scott@richrelevance.com>
Scott Carey <scott@richrelevance.com> wrote:
> On 3/11/09 11:04 AM, "Andrej" <andrej.groups@gmail.com> wrote:
>> 2009/3/12 Scott Carey <scott@richrelevance.com>:
>>> All tests start with 'cat 3 > /proc/sys/vm/drop_caches'
>> What's the content of '3' above?
> Google > *linux drop_caches* first result:
> http://www.linuxinsight.com/proc_sys_vm_drop_caches.html
>
> To be sure a test is going to disk and not file system cache for
> everything in linux, run:
> *sync; cat 3 > /proc/sys/vm/drop_caches*
The cited page recommends "echo 3" -- is that what you used in your
tests, or the "cat 3" you repeated specify? If the latter, what is in
the "3" file?
>> Please don't top post, and don't use HTML e-Mail :} Make your
>> quotes concise.
>>
>> http://www.american.edu/econ/notes/htmlmail.htm
Did you miss this part?
-Kevin
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To: pgsql-performance@postgresql.org
Cc: Kevin.Grittner@wicourts.gov, scott@richrelevance.com, gryzman@gmail.com, Andrej <andrej.groups@gmail.com, threshar@torgo.978.org
Subject: Re: random_page_cost vs ssd?
In-Reply-To: <49B7CD6B.EE98.0025.0@wicourts.gov>
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