Horton

Re: Clock sweep not caching enough B-Tree leaf pages?

Bruce Momjian <bruce@momjian.us>

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From: Bruce Momjian <bruce@momjian.us>
To: Peter Geoghegan <pg@heroku.com>
Cc: Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2014-04-15T00:30:16Z
Lists: pgsql-hackers 
On Mon, Apr 14, 2014 at 10:11:53AM -0700, Peter Geoghegan wrote:
> Has anyone thought about this in the last few years? I know that Tom
> examined the LRU-K paper back in 2000 [5], but was discouraged by some
> kind of contention or CPU overhead (although he did say he intended to
> revisit the question). Obviously a lot has changed in the past 14
> years, particularly with regard to CPU characteristics.

I am glad you are looking at this.  You are right that it requires a
huge amount of testing, but clearly our code needs improvement in this
area.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + Everyone has their own god. +

Commits

  1. Replace the BufMgrLock with separate locks on the lookup hashtable and