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ionice to make vacuum friendier?

From: Ron Mayer <rm_pg(at)cheapcomplexdevices(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: ionice to make vacuum friendier?
Date: 2007-07-17 22:29:32
Message-ID: f7jfs1$ntm$1@news.hub.org (view raw or flat)
Thread:
Lists: pgsql-performance
Seems Linux has IO scheduling through a program called ionice.

Has anyone here experimented with using it rather than
vacuum sleep settings?

http://linux.die.net/man/1/ionice
   This program sets the io scheduling class and priority
   for a program. As of this writing, Linux supports 3 scheduling
   classes:

   Idle. A program running with idle io priority will only get disk
   time when no other program has asked for disk io for a defined
   grace period. The impact of idle io processes on normal system
   activity should be zero.[...]

   Best effort. This is the default scheduling class for any process
   that hasn't asked for a specific io priority. Programs inherit the
   CPU nice setting for io priorities. [...]

http://friedcpu.wordpress.com/2007/07/17/why-arent-you-using-ionice-yet/

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