RE: 40% slowdown with dynamic /bin/sh

From: Guy Helmer (ghelmer_at_palisadesys.com)
Date: 11/25/03

  • Next message: Andrew Gallatin: "Re: 40% slowdown with dynamic /bin/sh" 
    To: "Jacques A. Vidrine" <nectar@freebsd.org>, "Andrew Gallatin" <gallatin@cs.duke.edu>
Date: Tue, 25 Nov 2003 09:40:47 -0600

    Jacques A. Vidrine wrote:
    > On Mon, Nov 24, 2003 at 10:06:12PM -0500, Andrew Gallatin wrote:
    > > How about Gordon's initial bootstone, which increased by 25%?
    > > http://docs.freebsd.org/cgi/mid.cgi?16091.44150.539095.704531
    > >
    > > And I just did a "make clean" run in /usr/ports/archivers (by manually
    > > mv'ing a static and dynamic sh to /bin in turn):
    > >
    > > static: 96.63 real 53.45 user 39.27 sys
    > > dynamic: 112.42 real 55.51 user 51.62 sys
    > >
    > > The wall clock is bad (16% worse) and the system time is worse (31%).
    > So can we just have a statically linked /bin/sh and get on with life?
    > That seems to have the most impact. We can also expend our efforts
    > to improve dynamic linking performance, since that will improve the
    > performance of the other 99.9% of the universe.

    Yes, let's do it and get on with it. /bin/sh is critically important
    to the performance of many things in the system, but shared / is very
    useful as well - it's allowed me to move my 4.x systems with small /
    up to 5-current, and / programs can take advantage of NSS and PAM
    modules that exist *today*.
     
    > ...
    > In any case, I'd really like to see a goal for 5.3-RELEASE that
    > includes bringing dynamically-linked /bin/sh performance (*much*)
    > closer to statically-linked /bin/sh performance.

    Yes -- this is -current: let's get 5.2 out the door and improve on it
    for 5.3.

    Guy Helmer

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