Date: Sat, 22 Sep 2007 01:01:24 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Andreas Pettersson <andpet@telia.com> Cc: freebsd-questions@freebsd.org Subject: Re: top columns VCSW and IVCSW Message-ID: <20070921220124.GB1948@kobe.laptop> In-Reply-To: <46F41F2D.6040503@telia.com> References: <46F41F2D.6040503@telia.com>
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On 2007-09-21 21:44, Andreas Pettersson <andpet@telia.com> wrote: > I couldn't find it in the man page and Google turned up with nothing of > value so I ask here. > What does the top (in IO mode) columns VCSW and IVCSW mean? VCSW = 'Voluntary context switches' IVCSW = 'Involuntary context switches' The first type of context switch happens when a process yields before it has used its allotted time-quantum (i.e. because of an I/O request). The second type of context switch happens when a process eats up all of its quantum, and it is forcibly context-switched out of a CPU core by the scheduler, to let other processes run. The manpage doesn't document all the ``-m io'' columns, so we should try to fix it :(
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