Cygwin Performance and stat()

[Larry Hall (Cygwin)]

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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