From owner-cvs-all Sun Nov 25 16:44:34 2001 Delivered-To: cvs-all@freebsd.org Received: from obsecurity.dyndns.org (adsl-64-165-226-105.dsl.lsan03.pacbell.net [64.165.226.105]) by hub.freebsd.org (Postfix) with ESMTP id 7529037B41A; Sun, 25 Nov 2001 16:44:17 -0800 (PST) Received: by obsecurity.dyndns.org (Postfix, from userid 1000) id 1B8A566B27; Sun, 25 Nov 2001 16:44:17 -0800 (PST) Date: Sun, 25 Nov 2001 16:44:16 -0800 From: Kris Kennaway To: Ian Dowse Cc: Kris Kennaway , cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/usr.bin/tail forward.c Message-ID: <20011125164416.B94982@xor.obsecurity.org> References: <20011125153656.A94203@xor.obsecurity.org> <200111260038.aa52845@salmon.maths.tcd.ie> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-md5; protocol="application/pgp-signature"; boundary="JP+T4n/bALQSJXh8" Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <200111260038.aa52845@salmon.maths.tcd.ie>; from iedowse@maths.tcd.ie on Mon, Nov 26, 2001 at 12:38:47AM +0000 Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG --JP+T4n/bALQSJXh8 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Nov 26, 2001 at 12:38:47AM +0000, Ian Dowse wrote: > In message <20011125153656.A94203@xor.obsecurity.org>, Kris Kennaway writ= es: > >I dunno..the major use of tail -F is probably on logfiles which get > >rotated infrequently. I can imagine that a site might want to > >simultaneously monitor a large number of logfiles, but I don't know > >what the CPU impact of that with your change would be..maybe not much. > >If you tail -F, say, 100 simultaneous files, how much CPU does that > >stat'ing use? >=20 > Running 100 "tail -F"s requires a pretty negliglible amount of CPU > time (try it!), but kqueue does help by allowing the processes to > be swapped out during any long pauses between file updates. Okay, it seems like this doesn't have any real-world impact then. I'm not bothered by it. Kris --JP+T4n/bALQSJXh8 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE8AZBNWry0BWjoQKURAvcrAKCmrq6UNPluZ3evU0lNM1AVJKRedgCgo5ZQ EScPZUC66XbXn0cjNqrOhe4= =vKR2 -----END PGP SIGNATURE----- --JP+T4n/bALQSJXh8-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message