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From: "Ken Hirsch" <kenhirsch@myself.com>
To: "Anton Altaparmakov" <aia21@cam.ac.uk>
Cc: <linux-kernel@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>
In-Reply-To: <3C945635.4050101@mandrakesoft.com> <5.1.0.14.2.20020317170621.00abd980@pop.cus.cam.ac.uk>
Subject: Re: fadvise syscall?
Date: Sun, 17 Mar 2002 13:35:35 -0500
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Anton Altaparmakov writes
> Posix or not I still don't see why one would want that. You know what you
> are going to be using a file for at open time and you are not going to be
> changing your mind later. If you can show me a single _real_world_ example
> where one would genuinely want to change from one access pattern to
another
> without closing/reopening a particular file I would agree that fadvise is
a
> good idea but otherwise I think open(2) is the superior approach.
>

Sure, a database manager can change the access pattern on every query.  If
there's an index and not too many records are expected to match, it will use
a random pattern, otherwise it will use sequential access.





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