Date: Thu, 17 Aug 2006 00:11:21 +0200 From: "O. Hartmann" <ohartman@mail.uni-mainz.de> To: Dan Nelson <dnelson@allantgroup.com> Cc: Mike Jakubik <mikej@rogers.com>, stable@freebsd.org Subject: Re: TOP shows above 100% WCPU usage Message-ID: <44E39809.10104@mail.uni-mainz.de> In-Reply-To: <20060815172728.GB88051@dan.emsphone.com> References: <44E1F796.5070105@rogers.com> <20060815172728.GB88051@dan.emsphone.com>
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Dan Nelson wrote: > In the last episode (Aug 15), Mike Jakubik said: > >> 35 processes: 7 running, 28 sleeping >> CPU states: 58.1% user, 0.0% nice, 38.4% system, 1.1% interrupt, 2.4% idle >> Mem: 642M Active, 416M Inact, 125M Wired, 112M Buf, 825M Free >> Swap: 4071M Total, 4071M Free >> >> PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND >> 465 mysql 18 20 0 905M 641M kserel 0 39:18 160.64% mysqld >> 631 root 1 96 0 2424K 1668K CPU1 0 0:02 0.00% top >> >> How can mysql use 160%? Is this a reporting bug in top because mysql is >> threaded? >> > > You have multiple CPUs, so a threaded process can theoretically reach > 100*ncpus cpu usage. > > I use FreeBSD 6.1-STABLE/AMD on an pure 64Bit box/environment, single CPU Athlon 3500+, and sometimes I can see a 100%+ usage of WCPU in 'xine' or 'transmission'. So this is definitely not related to multiple CPUs.
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