Date: Mon, 22 Aug 2005 16:36:11 +0200 From: "pobox@verysmall.org" <pobox@verysmall.org> To: Mario Hoerich <spambox@MHoerich.de> Cc: freebsd-questions@freebsd.org Subject: Re: top -I and load average from 4.9 into 5.4 Message-ID: <4309E2DB.1070000@verysmall.org> In-Reply-To: <20050822142101.GB74593@Pandora.MHoerich.de> References: <4309C9F7.3070904@verysmall.org> <20050822142101.GB74593@Pandora.MHoerich.de>
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>> We upgraded from 4.9 to 5.4 and the 'top -I' and load average seem to >> behave slightly different. 'top -I' in 5.4 stays empty most of the time >> with processes flashing in and out from time to time. > > Well, I'd actually expect them to, as -I filters out any idle > process. Justed tested on my 6.0B2, major CPU hogs are shown > as expected. That's clear. Just on the same server under 4.9 somehow the processes tend to 'stay longer' and not just flash for parts of the second. Now under 5.4 the list 'top -I' is most of the time empty while the CPU goes from 0% to 20% and back all the time. And just very seldom a process flashes in the list. 'top' under 5.4 shows all the time 3-5 active processes at the top of the list. >> In 4.9 the processes stayed there until they are done. > > Where's the difference to top [-i], then? 'top' shows a long list with active and not active. 'top -I' shows just the active ones, but as some take few seconds - they do stay there for few seconds (under 4.9). Under 5.4 they either do not show or if they show - it is for parts of the second. > I don't really know enough about how load and utilization > are calculated. I'd guess load is calculated by the scheduler, > based on the number of processes whining for more/larger time > slices, whereas utilization is guessimated elsewhere, probably > something like process CPU time / available CPU time. > > I'm none too sure there's an actual correlation between these > values, let alone load 1 = utilization 100%. I had this feeling. So that's clear. Just the question is now why 'top -I' under 5.4 is so quiet. Has something changed in 5.x or is it a question of setup? Iv
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