Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sources.redhat.com/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/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
From: "Gary R. Van Sickle" <g DOT r DOT vansickle AT worldnet DOT att DOT net>
To: <cygwin AT cygwin DOT com>
Subject: RE: pipe improvements in snapshot
Date: Thu, 12 Dec 2002 00:08:17 -0600
Message-ID: <NCBBIHCHBLCMLBLOBONKKEHCDJAA.g.r.vansickle@worldnet.att.net>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
In-Reply-To: <000b01c2a169$672f8240$659ac250@leper>
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106
Importance: Normal

> W98/SE. With the current cygwin1.dll I tried
>     time cat <hugefile> | nice -0 dd of=/dev/null
>     time cat <hugefile> | nice --1 dd of=/dev/null
> where hugefile ~ 100MB, and got times roughly 1m20s with the 2nd instruction
> marginally faster. Then switched to the snapshot cygwin1-20021210.dll and
> shaved a minute yes a minute off the times. Then tried creating new files as
> in
>     time cat <hugefile> | nice -0 dd of=hugefile2
>     time cat <hugefile> | nice --1 dd of=hugefile3
> (this took about 30s each) and checked md5sums. Not a byte out of place.
> Fergus
> P.S. Thanks to thomas for these good diagnostic scripts.
>

OH.  MY.  GOD.

If I understand the problem and solution (which I marginally do), and Win9x vs.
WinNT/XP (which nobody really does), this ***~2.66x*** speedup should be even
greater on NT/XP.

I'm giddy with anticipation over what this might do to configure times etc.

This may be the coolest thing since sliced time.

--
Gary R. Van Sickle
Brewer.  Patriot.


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/