X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-0.7 required=5.0 	tests=BAYES_20
X-Spam-Check-By: sourceware.org
Date: Sat, 23 Jan 2010 11:19:36 -0600
From: David Morgan <dmorgan AT aechelon DOT com>
To: cygwin AT cygwin DOT com
Cc: mlm AT aechelon DOT com
Subject: Cygwin slow on x64 systems
Message-ID: <20100123171936.GE23796@err>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.5.18 (2008-05-17)
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.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

Hello all,

	We use cygwin for our build environment, and have observed that 
everything runs extremely slow on x64 systems, for versions newer than
approximately 1.5.12 (including 1.7.1).  When I run the following command
in BASH,

while true; do date >> file; done

on a 1.5.12 Core II system, I get approximately 100 dates per second.  
On a 1.7.1 Nehalem system, I get approximately 15, and it takes several
seconds for Ctrl-C to take effect, whereas it's instantaneous on 1.5.12.
It makes no difference whether I redirect the output or not.

We have found that the problem was introduced somewhere between 1.5.12 
and 1.5.24-2.   We have not seen any such slowdown on x86 systems.
We have observed this on XP x64, Server 2003 R2 x64, and now (with 1.7.1
only) on Windows 7 x64.

Can anyone recommend how we could profile this to help isolate the problem?
We have vTune and Quantify in-house.

Regards,

David


--
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