Date: Mon, 7 Jul 2003 17:46:23 +0200 (CEST) From: Harti Brandt <brandt@fokus.fraunhofer.de> To: Dan Nelson <dnelson@allantgroup.com> Cc: current@freebsd.org Subject: Re: /dev/shm Message-ID: <20030707174510.D49607@beagle.fokus.fraunhofer.de> In-Reply-To: <20030707154235.GD71703@dan.emsphone.com> References: <3F08B199.3050409@comcast.net> <3F08B79B.2040805@gmx.net> <20030707002347.GC5141@aurema.com> <20030706203440.D89894@vhost101.his.com> <3F08C4FD.8010107@gmx.net> <m3el12lf91.fsf@merlin.emma.line.org> <3F09663D.9020200@gmx.net> <20030707154235.GD71703@dan.emsphone.com>
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Hi, I'm not sure, whether this mailing list is the correct place for linux-centered discussions. Perhaps you want to continue via private mail? Regards, harti On Mon, 7 Jul 2003, Dan Nelson wrote: DN>In the last episode (Jul 07), Matthias Andree said: DN>> Marcin Dalecki schrieb am 2003-07-07: DN>> > Matthias Andree wrote: DN>> > >Update your Linux top or run fewer processes on it then. :-> DN>> > DN>> > You know that file system name lookup is one of the most expensive DN>> > system calls under UNIX? DN>> DN>> So what? If you don't like the interface because it does ever so DN>> expensive file system lookups (I wonder what's so expensive if no DN>> disk drive latencies are involved), suggest a better one and donate DN>> an implementation. DN>> DN>> I'm sure I'd find disadvantages of non-Linux top if I only cared to DN>> look. I don't. It works when I need it, it's not in my way otherwise, DN>> that's as much as I care. DN> DN>There is already a functional non-procfs implementation that has been DN>around long before procps top: groupsys top 3.5b12 (i.e. the top that DN>all other non-Linux systems use) compiles fine on even the newest Linux DN>kernels with the attached patch. It's one of the first things I build DN>on a new Linux box. Procps top is way too slow; it takes a full 5 DN>seconds just for the first screen refresh on a mostly-idle box with 400 DN>processes. groupsys top is basically instantaneous. And don't think DN>about accidentally hitting a cursor or function key which running DN>procps top; it doesn't even use curses, so it beeps and waits 2 seconds DN>for each character in the escape sequence :) DN> DN> -- harti brandt, http://www.fokus.fraunhofer.de/research/cc/cats/employees/hartmut.brandt/private brandt@fokus.fraunhofer.de, harti@freebsd.org
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