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Re: adding support for posix_fadvise()

From: Neil Conway <neilc(at)samurai(dot)com>
To: Manfred Spraul <manfred(at)colorfullife(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 20:23:09
Message-ID: 1067890989.3089.540.camel@tokyo (view raw or flat)
Thread:
Lists: pgsql-hackers
On Mon, 2003-11-03 at 14:24, Manfred Spraul wrote:
> 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 
> sync'ed.

I'll try those, in case it makes any difference. My guess/hope is that
it won't (as mentioned earlier), but we'll see.

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

No idea. Can anyone recommend what kind of benchmark would be be
appropriate?

-Neil



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