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Date: Tue, 1 Jun 2010 17:06:12 -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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That's fine, can you propose something that is acceptable?

BTW, who does this patch need to pass muster with?  The only maintainer I
could find is Dave Korn.

Thanks,

Chris


> On 6/1/2010 5:42 PM, 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.
>
> Thanks for this information and perhaps I'm wrong but I don't believe
> anyone in this thread thought that you were lying when you noted issues
> with the performance of stat(). ;-)  But providing a variant of stat()
> along the lines of what you propose above is not practical for all the
> reasons already stated.  I believe we would all like stat() to be
> quicker but we need something that solves the root of the problem and
> not partial, hidden solutions that are problematic to use.
>
> --
> Larry Hall                              http://www.rfk.com
> RFK Partners, Inc.                      (508) 893-9779 - RFK Office
> 216 Dalton Rd.                          (508) 893-9889 - FAX
> Holliston, MA 01746
>
> _____________________________________________________________________
>
> A: Yes.
>> Q: Are you sure?
>>> A: Because it reverses the logical flow of conversation.
>>>> Q: Why is top posting annoying in email?
>
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