X-Recipient:	archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status:	No, hits=-0.5 required=5.0 tests=AWL,BAYES_40,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,T_TO_NO_BRKTS_FREEMAIL
X-Spam-Check-By:	sourceware.org
MIME-Version:	1.0
In-Reply-To:	<4C87AEB9.5020001@redhat.com>
References:	<AANLkTi=ASzGNwU9TSKU2TZSbAksy6=Pu94=0S5Vt0Sc- AT mail DOT gmail DOT com> <4C86867D DOT 4050509 AT cygwin DOT com> <AANLkTi=rN9OA4Qp0eCbiWN0Kt_pvjDwDVfOERBzR1iCZ AT mail DOT gmail DOT com> <4C87AACB DOT 6050805 AT cygwin DOT com> <4C87AEB9 DOT 5020001 AT redhat DOT com>
Date:	Sat, 11 Sep 2010 10:52:19 -0500
Message-ID:	<AANLkTin6VxrfhQRD2w6SRKfnThTZPT219zQZNmW0C=8o@mail.gmail.com>
Subject:	Re: incredibly slow file listing script on windoze 7 pro 4 core 64 bit
From:	mike marchywka <marchywka AT gmail DOT com>
To:	cygwin AT cygwin DOT com
X-IsSubscribed:	yes
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

On 9/8/10, Eric Blake <eblake AT russianhut DOT comie> wrote:
> On 09/08/2010 09:24 AM, Larry Hall (Cygwin) wrote:
>> To somewhat sooth your curiousity, Windows (or perhaps it's more accurate
>> to say NTFS) ain't great with directories with a large number of files.
>> I expect you would be less than impressed with the performance of of 'dir'
>> in 'cmd.exe' in the same directory. That said, you're asking for allot
>> more
>> work than you may realize when doing the same thing in Cygwin. In order to

I don't want to add more clutter with this contrived example but
just to make a point, I just got a 500G WD USB disk and sent these
things to their final resting place. I had to reformat it is as vfat as that
seems to be the only thing that is RW everywhere. I ran the script
on this newer debian install with vfat and USB disk and it is faster
than 'doze and probably faster than old emachines because I now
have 2.8ghz CPU LOL.




>> fill in the information you ask for when you use the '-l' flag for 'ls',
>> Cygwin needs to open and close the files, which takes a good chunk of time
>> en masse. The same does not need to happen in Linux/UNIX-land.
>
> Additionally, the stat() interface is puny - it MUST take the time to
> fill out the complete struct, even if the caller only cares for part of
> the information.  If the Linux kernel ever incorporates the pending
> xstat() kernel call[1], then cygwin adds support for it, and coreutils
> is taught to make good use of it, then operations like ls can be sped up
> by asking for only the portions of the stat data that they plan on
> actually using, letting cygwin skip the work of obtaining the rest of
> the stat information just to be thrown away by the caller.
>
> [1]version 6 of that kernel patch is still being debated; as recently as
> http://lkml.indiana.edu/hypermail/linux/kernel/1008.2/00274.html
>

--
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 -