From owner-freebsd-current@FreeBSD.ORG  Mon Nov 24 19:05:38 2003
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 22C8916A4CE
	for <freebsd-current@freebsd.org>;
	Mon, 24 Nov 2003 19:05:38 -0800 (PST)
Received: from speicher.org (speicher.org [208.199.76.238])
	by mx1.FreeBSD.org (Postfix) with ESMTP id DEFEB43FE0
	for <freebsd-current@freebsd.org>;
	Mon, 24 Nov 2003 19:05:36 -0800 (PST)
	(envelope-from geoff@speicher.org)
Received: from speicher.org (localhost [127.0.0.1])
	by speicher.org (8.12.10/8.12.10) with ESMTP id hAP35UDR001861
	for <freebsd-current@freebsd.org>;
	Mon, 24 Nov 2003 22:05:30 -0500 (EST)
	(envelope-from geoff@speicher.org)
Received: (from geoff@localhost)
	by speicher.org (8.12.10/8.12.10/Submit) id hAP35PIx001860
	for freebsd-current@freebsd.org; Mon, 24 Nov 2003 22:05:25 -0500 (EST)
	(envelope-from geoff)
Date: Mon, 24 Nov 2003 22:05:25 -0500
From: Geoff Speicher <geoff@speicher.org>
To: freebsd-current@freebsd.org
Message-ID: <20031125030525.GA1768@sirius.speicher.org>
References: <16322.26365.159173.946033@grasshopper.cs.duke.edu>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <16322.26365.159173.946033@grasshopper.cs.duke.edu>
User-Agent: Mutt/1.4.1i
Subject: Re: 40% slowdown with dynamic /bin/sh
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 25 Nov 2003 03:05:38 -0000
X-List-Received-Date: Tue, 25 Nov 2003 03:05:38 -0000

On Mon, Nov 24, 2003 at 03:15:57PM -0500, Andrew Gallatin wrote:
> 
> % /usr/bin/time ./harness.sh ./sh.dynamic 100
>         1.60 real         0.21 user         1.18 sys
> 
> % ./harness.sh ./sh.static 100
>         1.12 real         0.08 user         0.87 sys
> 
> So.. forking a dynamic sh is roughly 40% more expensive than
> forking a static copy of sh.  This is embarrassing.

All this noise because, for every 1,000 invocations of dynamic
/bin/sh, you have to wait nearly an extra 5 seconds.

Truly embarrassing, indeed.  Totally unacceptable for a BETA release.

We all could have collectively spawned millions of dynamic shells
in the time that it has taken to compile this thread.  But we didn't.
Can't be all that important, can it?  :)

Geoff