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To: cygwin@cygwin.com
Subject: Re: SLOW ls(1) - cygwin dir lookups with WinNT async requests?
In-Reply-To: <CA+1jF5rbmDgawqu4QsYVRVTH+JgGf6GByxUKKy84RDjejOnihw@mail.gmail.com>
 (=?utf-8?Q?=22Aur=C3=A9lien?= Couderc via Cygwin"'s message of "Mon, 21 Jul
 2025 17:19:00 +0200")
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Date: Mon, 21 Jul 2025 19:13:51 +0200
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From: ASSI via Cygwin <cygwin@cygwin.com>
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Aurélien Couderc via Cygwin writes:
>> > 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?
>
> Because I am not YET qualified? This is god level Cygwin hacking
> level, like Corinna Vinschen can do. I'm just a student, doing some
> ReactOS/Windows hacking.

You could at least demonstrate that doing the async calls you mention
are in fact improving the time it takes to gather the necessary
information vs.  a sequential implementation.  No Cygwin hacking is
required to do that.  As it stands, you are assuming it does, but have
shown absolutely no data.  I would counter that NTFS is not a fast
filesystem in any way, shape or form and in my experience does not
respond with all that much scaling if hit with parallel requests (that
also depends on the type of device targeted).  But I too have not looked
at the exact same sequence of calls that you are proposing to do
asynchronously.  So again, data needed… care to provide some?


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

SD adaptation for Waldorf rackAttack V1.04R1:
http://Synth.Stromeko.net/Downloads.html#WaldorfSDada

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