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Date: Wed, 2 Jun 2010 10:06:26 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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Subject: Re: Cygwin Performance and stat()
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On Jun  1 14:42, Christopher Wingert wrote:
> I think there are a lot of use cases where the extra information (ACL
> information *I assume* is the majority of the problem) is unnecessary. 
> For most of the applications filename, size, and the three dates are all
> that is necessary.  So cygwin stat is overkill.  So if I can tell the
> emulation layer (via an environment flag) or the actually utility
> (bash/ls/make/find/du) via a command line switch, I think I can save a lot
> of time waiting.
> 
> Just to highlight how bad this problem is.  I have a network drive with
> 681 sub directories and approximately 90k files.  A time comparison for
> getting directory information as follows:
> 
> *DOS "dir /s" takes 17 seconds.
> *Cygwin "ls -lR" takes 5950 seconds (that's almost two hours).
> *msls -lR takes 55 seconds.
> *myls (see code below) takes 7 seconds.
> 
> Each test was done twice and after a reboot to make sure there was no
> caching involved.
> 
> To be clear, Cygwin ls is 850X slower.

Did you try to mount the network drive with the "noacl" mount option?
That skips requesting the owner/group information.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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