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Re: adding support for posix_fadvise()

From: Manfred Spraul <manfred(at)colorfullife(dot)com>
To: Neil Conway <neilc(at)samurai(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Hannu Krosing <hannu(at)tm(dot)ee>,PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: adding support for posix_fadvise()
Date: 2003-11-03 19:24:59
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Neil Conway wrote:

>The present Linux implementation doesn't do this, AFAICS -- all it does
>it increase the readahead for this file:
AFAIK Linux uses a modified LRU that automatically puts pages that were 
touched only once at a lower priority than frequently accessed pages.

Neil: what about calling posix_fadvise for the whole file immediately 
after issue_xlog_fsync() in XLogWrite? According to the comment, it's 
guaranteed that this will happen only once.
Or:  add an posix_fadvise into issue_xlog_fsync(), for the range just 

Btw, how much xlog traffic does a busy postgres site generate?


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