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

From: Josh Berkus <josh(at)agliodbs(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Cc: "Simon Riggs" <simon(at)2ndquadrant(dot)com>, "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 18:45:27
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackerspgsql-patches

> 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.


Josh Berkus
PostgreSQL @ Sun
San Francisco

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