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Re: adding support for posix_fadvise()

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Neil Conway <neilc(at)samurai(dot)com>
Cc: 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 15:01:55
Message-ID: 14249.1067871715@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Neil Conway <neilc(at)samurai(dot)com> writes:
> POSIX_FADV_RANDOM doesn't effect the page cache, it just determines how
> aggressive the kernel is when doing readahead (at least on Linux, but
> I'd expect to see other kernels implement similar behavior).

I would expect POSIX_FADV_SEQUENTIAL to reduce the chance that a page
will be kept in buffer cache after it's been used.

			regards, tom lane

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