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Re: Performance increase with elevator=deadline

From: Gregory Stark <stark(at)enterprisedb(dot)com>
To: "Albe Laurenz" <laurenz(dot)albe(at)wien(dot)gv(dot)at>
Cc: <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Performance increase with elevator=deadline
Date: 2008-04-11 14:47:17
Message-ID: 878wzkh2iy.fsf@oxford.xeocode.com (view raw or flat)
Thread:
Lists: pgsql-performance
"Albe Laurenz" <laurenz(dot)albe(at)wien(dot)gv(dot)at> writes:

> This refers to the performance problem reported in
> http://archives.postgresql.org/pgsql-performance/2008-04/msg00052.php
>
> After some time of trial and error we found that changing the I/O scheduling
> algorithm to "deadline" improved I/O performance by a factor 4 (!) for
> this specific load test.

What was the algorithm before?

-- 
  Gregory Stark
  EnterpriseDB          http://www.enterprisedb.com
  Ask me about EnterpriseDB's On-Demand Production Tuning

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