Re: /dev/shm

From: Harti Brandt (brandt_at_fokus.fraunhofer.de)
Date: 07/07/03

  • Next message: Steve Kargl: "Re: buildkernel ULE related breakage" 
    Date: Mon, 7 Jul 2003 17:46:23 +0200 (CEST)
To: Dan Nelson <dnelson@allantgroup.com>

    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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