Date: Tue, 12 Jan 2010 09:46:49 -0800 From: Chuck Swiger <cswiger@mac.com> To: Anton Shterenlikht <mexas@bristol.ac.uk> Cc: freebsd-questions@freebsd.org Subject: Re: top/ps: is Active Memory = sum(resident set size)? Message-ID: <11F836C5-7E9F-4ACC-948F-196EF605F1AB@mac.com> In-Reply-To: <20100112141726.GA23278@mech-cluster241.men.bris.ac.uk> References: <20100112141726.GA23278@mech-cluster241.men.bris.ac.uk>
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Hi-- On Jan 12, 2010, at 6:17 AM, Anton Shterenlikht wrote: > Should the Active memory, as reported by top(1), be equal to the > sum of rss (the real memory (resident set) size of the process) > of all processes, as reported by ps(1)? No. They aren't measuring the same thing; in a system with plenty of available RAM, processes might be entirely resident because there is no memory pressure to start paging inactive pages out, but only be using a fraction of their address space, in which case active per top will be less than the sum of RSS. -- -Chuck
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