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Re: O_DIRECT use

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: O_DIRECT use
Date: 2002-01-04 21:29:51
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Lists: pgsql-hackers
Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> I have added this item to TODO:
> 	* Consider use of open/fctl(O_DIRECT) to minimize OS caching

Why exactly would we wish to minimize OS caching?

In my mind, Postgres has always relied heavily on the existence of a
layer of kernel caching.  Disabling that will hurt far more than help.

			regards, tom lane

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