Date: Thu, 17 Aug 2006 14:26:01 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Brent Casavant <b.j.casavant@ieee.org> Cc: Bill LeFebvre <bill@lefebvre.org>, freebsd-stable@freebsd.org Subject: Re: TOP shows above 100% WCPU usage Message-ID: <20060817192601.GB30450@dan.emsphone.com> In-Reply-To: <20060817120221.D20436@pkunk.americas.sgi.com> References: <44E1F796.5070105@rogers.com> <20060815172728.GB88051@dan.emsphone.com> <44E204C0.60806@rogers.com> <44E3FE61.6060800@lefebvre.org> <5C8C1B11-DE0B-4FE2-9A3D-5472650B9FA8@mac.com> <20060817120221.D20436@pkunk.americas.sgi.com>
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In the last episode (Aug 17), Brent Casavant said: > Note that IRIX's top does not bias for availabile CPUs -- I've seen > well-threaded programs using in excess of 2400% CPU. > > What it comes down to is that depending on the nature of the > information you're trying to glean from WCPU, you may want either > view of the data. Some versions of top on Linux allow you to switch > between IRIX and Solaris views. From the help screen for top from > procps 3.2.6 on Linux: > > 1,I Toggle SMP view: '1' single/separate states; 'I' Irix/Solaris mode > > There's really not a clear cut right and wrong here, particularly if > your version of top is able to display per-thread instead of > per-process data. Sometimes you want to break out individual threads > and see their level of CPU utilization (the IRIX view is most > useful), sometimes you want to get a handle on which processes are > loading down a machine (the Solaris view is most useful). Is this similar to FreeBSD top's 'H' option? -- Dan Nelson dnelson@allantgroup.com
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