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Date:	Fri, 18 Jul 2025 13:44:34 +0300
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Subject:	Re: SLOW ls(1) - cygwin dir lookups with WinNT async requests?
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From:	Andrey Repin via Cygwin <cygwin AT cygwin DOT com>
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X-MIME-Autoconverted:	from base64 to 8bit by delorie.com id 56IAp8vw2612623

Greetings, Aurélien Couderc!

>> >> Stat and ACL info require additional calls.
>>
>> > Right, but my proposal is to do parallel/async lookups. The Windows NT
>> > kernel depends heavily on multithreading and parallelism, of which
>> > Cygwin uses nothing right now for dir lookups.
>>
>> Not an option unless it can be cheaply done under winsup/cygwin/fhandler.
>> Most utilities are GNU/BSD/Linux ports, so custom mods would have to be
>> submitted and accepted upstream, as we often already have enough patches to
>> maintain, to get them to build and work cleanly under Cygwin.

> I think you misunderstand me. I am suggesting to improve the Cygwin
> implementation of opendir(), readdir() and friends to do Win32/WInNT
> calls async to speed up dir listings.

If you know how it can be done, why not provide a patch?


-- 
With best regards,
Andrey Repin
Friday, July 18, 2025 13:44:05

Sorry for my terrible english...

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