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Date: Wed, 2 Jun 2010 10:46:03 -0700
Subject: Re: Cygwin Performance and stat()
From: "Christopher Wingert" <mailbox AT wingert DOT org>
To: cygwin AT cygwin DOT com
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Thanks for the pointer, I just gave it a whirl, it actually didn't make
much of a difference.

I am going to start looking into making a patch.

Chris



> 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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