Date: Thu, 7 Oct 2010 14:34:27 +0100 From: RW <rwmaillists@googlemail.com> To: freebsd-questions@freebsd.org Subject: Re: Cache Memory in top command Message-ID: <20101007143427.1245645f@gumby.homeunix.com> In-Reply-To: <201010071113.o97BDg0X017404@mp.cs.niu.edu> References: <201010071113.o97BDg0X017404@mp.cs.niu.edu>
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On Thu, 7 Oct 2010 06:13:42 -0500 (CDT) Scott Bennett <bennett@cs.niu.edu> wrote: > On Wed, 29 Sep 2010 12:42:30 +0100 Bruce Cran <bruce@cran.org.uk> > wrote: > >You can find more information about the VM architecture at > >http://www.freebsd.org/doc/en/books/arch-handbook/vm.html . > > > The top(1) man page is clearly in error, at least on FreeBSD > systems. The descriptions of the Active, Inact, Wired, Cache, Buf, > and Free fields are all wrong inasmuch as the word "pages" in each > should instead be "bytes". For example, top on my system at present > shows: > > Mem: 1099M Active, 401M Inact, 262M Wired, 88M Cache, 112M Buf, 143M > Free > > Consider the value given for "Wired" (i.e., page-fixed pages, which > cannot exceed the number of page frames on the machine, of course.) > Now, either "M" has some extraordinary definition, or it means > "mega", though presumably in the classical computing sense of the > power of 2 that is closest to one million. It does actually say, just above, that M and K are megabytes and kilobytes. It is wrong though, in that it has "number of pages" when it should have "memory from pages" or just "pages"
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