Date: Wed, 03 Aug 2011 16:01:30 -0700 From: Doug Barton <dougb@FreeBSD.org> To: Andriy Gapon <avg@FreeBSD.org> Cc: freebsd-ports@FreeBSD.org, Peter Jeremy <peterjeremy@acm.org> Subject: Re: UPDATING 20110730 Message-ID: <4E39D34A.7050102@FreeBSD.org> In-Reply-To: <4E392579.4070001@FreeBSD.org> References: <20110801085135.GA45113@lpthe.jussieu.fr> <4E367999.8000906@FreeBSD.org> <20110802210907.GB78870@server.vk2pj.dyndns.org> <4E392579.4070001@FreeBSD.org>
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On 08/03/2011 03:39, Andriy Gapon wrote: > on 03/08/2011 00:09 Peter Jeremy said the following: >> An alternative viewpoint is that this is wasteful because data is then >> double-buffered. > > If you stop accessing data on disk after putting it into an application cache, > then there would not be double-buffering, the OS is free to evict it from its cache. I agree with Andriy that the OS is smart enough to manage the disk buffer cache all on its own. Meanwhile, another detail that I didn't include in previous messages that I probably should have is that portmaster is already caching a whole bunch of stuff, which is one of the reasons it's as fast as it is. In fact, because it does a lot of this caching through environment variables I have run into problems where attempting to run external commands with long command lines sometimes fails because there is not enough memory available. As a result I've been attempting to streamline both my command lines, and what I cache. I hadn't had this complaint for a while but I got one the other day, so it looks like I still have some more work to do in this area. Doug -- Nothin' ever doesn't change, but nothin' changes much. -- OK Go Breadth of IT experience, and depth of knowledge in the DNS. Yours for the right price. :) http://SupersetSolutions.com/
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