Date: Tue, 1 Jan 2002 17:33:55 +0100 (CET) From: Roy Sigurd Karlsbakk <roy@karlsbakk.net> To: Dan Nelson <dnelson@allantgroup.com> Cc: <freebsd-questions@FreeBSD.ORG> Subject: Re: increasing readahead? Message-ID: <Pine.LNX.4.30.0201011733260.7743-100000@mustard.heime.net> In-Reply-To: <20011219200649.GA30574@dan.emsphone.com>
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On Wed, 19 Dec 2001, Dan Nelson wrote: > In the last episode (Dec 19), Roy Sigurd Karlsbakk said: > > I really need a LARGE readahead for my application. Does anyone know > > how I can increase the current one? > > man setvbuf > > > I also need a way to pre-allocate chunks of 4 megs when I'm writing > > to a file, to make the actual fragments large enough to eliminate a > > large part of the actual overhead of seeking > > Are you sure this is your problem? FreeBSD does write clustering and > allocates disk space to avoid fragmentation. Do you know how large these clusters are? Are there any way of monitoring / controlling these? roy -- Roy Sigurd Karlsbakk, MCSE, MCNE, CLS, LCA Computers are like air conditioners. They stop working when you open Windows. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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