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Re: [PATCHES] Full page writes improvement, code update

From: "Simon Riggs" <simon(at)2ndquadrant(dot)com>
To: <josh(at)agliodbs(dot)com>
Cc: <pgsql-hackers(at)postgresql(dot)org>,"Koichi Suzuki" <suzuki(dot)koichi(at)oss(dot)ntt(dot)co(dot)jp>,<pgsql-patches(at)postgresql(dot)org>
Subject: Re: [PATCHES] Full page writes improvement, code update
Date: 2007-03-29 20:28:36
Message-ID: 1175200117.4386.616.camel@silverbirch.site (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
On Thu, 2007-03-29 at 11:45 -0700, Josh Berkus wrote:

> > OK, different question:
> > Why would anyone ever set full_page_compress = off?
> 
> The only reason I can see is if compression costs us CPU but gains RAM & 
> I/O.  I can think of a lot of applications ... benchmarks included ... 
> which are CPU-bound but not RAM or I/O bound.  For those applications, 
> compression is a bad tradeoff.
> 
> If, however, CPU used for compression is made up elsewhere through smaller 
> file processing, then I'd agree that we don't need a switch.

Koichi-san has explained things for me now.

I misunderstood what the parameter did and reading your post, ISTM you
have as well. I do hope Koichi-san will alter the name to allow
everybody to understand what it does.

-- 
  Simon Riggs             
  EnterpriseDB   http://www.enterprisedb.com



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