Re: random_page_cost vs ssd?

From: hubert depesz lubaczewski <depesz(at)depesz(dot)com>
To: Scott Carey <scott(at)richrelevance(dot)com>
Cc: Andrej <andrej(dot)groups(at)gmail(dot)com>, Grzegorz Jaśkiewicz <gryzman(at)gmail(dot)com>, Jeff <threshar(at)real(dot)jefftrout(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: random_page_cost vs ssd?
Date: 2009-03-11 19:32:27
Message-ID: 20090311193227.GA19182@depesz.com
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On Wed, Mar 11, 2009 at 12:28:56PM -0700, Scott Carey wrote:
> 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’

well. the url you showed tells to do: echo 3 > ...
cat 3 is "slightly" different.

Best regards,

depesz

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