Date: Mon, 22 Aug 2005 19:09:52 -0400 From: Kris Kennaway <kris@obsecurity.org> To: "pobox@verysmall.org" <pobox@verysmall.org> Cc: Mario Hoerich <spambox@MHoerich.de>, freebsd-questions@freebsd.org Subject: Re: top -I and load average from 4.9 into 5.4 Message-ID: <20050822230952.GA12574@xor.obsecurity.org> In-Reply-To: <4309E2DB.1070000@verysmall.org> References: <4309C9F7.3070904@verysmall.org> <20050822142101.GB74593@Pandora.MHoerich.de> <4309E2DB.1070000@verysmall.org>
next in thread | previous in thread | raw e-mail | index | archive | help
--PEIAKu/WMn1b1Hv9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Aug 22, 2005 at 04:36:11PM +0200, pobox@verysmall.org wrote: > >>We upgraded from 4.9 to 5.4 and the 'top -I' and load average seem to= =20 > >>behave slightly different. 'top -I' in 5.4 stays empty most of the time= =20 > >>with processes flashing in and out from time to time.=20 > > > >Well, I'd actually expect them to, as -I filters out any idle=20 > >process. Justed tested on my 6.0B2, major CPU hogs are shown > >as expected. >=20 > That's clear. Just on the same server under 4.9 somehow the processes=20 > tend to 'stay longer' and not just flash for parts of the second. Now=20 > under 5.4 the list 'top -I' is most of the time empty while the CPU goes= =20 > from 0% to 20% and back all the time. And just very seldom a process=20 > flashes in the list. 'top' under 5.4 shows all the time 3-5 active=20 > processes at the top of the list. Sampling error. In order for top to run, nothing else can run on that CPU at the same time, so you won't get a very meaningful picture of short-lived processes that are instantaneously 'active'. Kris --PEIAKu/WMn1b1Hv9 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFDCltAWry0BWjoQKURAp7KAJ4gTCJSBMMD8KtVcyrQZ/vZsUp+SgCguhU7 viv2YRYqbVeVXlWem6Zrfdw= =lJ8L -----END PGP SIGNATURE----- --PEIAKu/WMn1b1Hv9--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050822230952.GA12574>