www.delorie.com/archives/browse.cgi   search  
Mail Archives: cygwin/2009/09/02/15:06:32

X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-0.3 required=5.0 tests=AWL,BAYES_00
X-Spam-Check-By: sourceware.org
From: "David Tazartes" <davidt81 AT earthlink DOT net>
To: "'Thrall, Bryan'" <bryan DOT thrall AT flightsafety DOT com>, <cygwin AT cygwin DOT com>
In-Reply-To: <786EBDA1AC46254B813E200779E7AD363AFE50@srv1163ex1.flightsafety.com>
Subject: RE: Simple bash script is slow to execute - appears to be time spent starting commands like ls
Date: Wed, 2 Sep 2009 15:06:15 -0400
MIME-Version: 1.0
Message-ID: <E1Miv9v-0007Hz-Jy@elasmtp-scoter.atl.sa.earthlink.net>
X-ELNK-Trace: 5bf265d7c89f1e8e1aa676d7e74259b7b3291a7d08dfec793641177e8cbd038583b2f4bf6552d7d7350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

Bryan Thrall wrote:

You're right about true being built-in, but we still don't know from
your examples whether the problem is from forking or from IO. Try
replacing 'true' in Jeremy's loop with '/bin/true'. Comparison between
the two should give us an idea of the forking cost, without IO getting
in the way.

-----

I had to reduce to 100 iterations.

On Linux:

real    0m0.448s
user    0m0.244s
sys     0m0.220s

On Cygwin:

real    0m48.411s
user    0m15.005s
sys     0m18.520s

So basically a factor of 100... again points to forking or Vista process
start slowness.



--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -


  webmaster     delorie software   privacy  
  Copyright © 2019   by DJ Delorie     Updated Jul 2019