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References:	<Zae9oMoQX5vyP6Gh AT calimero DOT vinschen DOT de>
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Date:	Sun, 21 Jan 2024 12:18:08 +0100
Message-ID:	<CAAvCNcB8cOYJethtACfhGoTyfa21ve2Tp-S3OW1B=hsk-7iX7Q@mail.gmail.com>
Subject:	Exponential slowdown for deep paths in Cygwin 3.5
To:	cygwin AT cygwin DOT com
Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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From:	Dan Shelton via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Dan Shelton <dan DOT f DOT shelton AT gmail DOT com>
Sender:	"Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

On Wed, 17 Jan 2024 at 12:44, Corinna Vinschen via Cygwin
<cygwin AT cygwin DOT com> wrote:
>
> Hi folks,
>
>
> we're planning to release Cygwin 3.5 end of this month (Jan 2024) if
> nothing serious crops up.
>

We still get severe performance problems with Cygwin 3.5 on Windows 10
with MAXPATH disabled, i.e. Control/FileSystem/LongPathsEnabled are
enabled.

One huge customer issue is the exponential slowdown for deep paths, e.g.
mkdir -p 0/1/2/3/4/5/6/7/8/9/a//b/c/d/e/f/g/h/o/j/k/l/m/n/o/p/q/r/t/s/u/v/w/x/y/z/
cd 0/1/2/3/4/5/6/7/8/9/a//b/c/d/e/f/g/h/o/j/k/l/m/n/o/p/q/r/t/s/u/v/w/x/y/z/

Now do something in that dir, like svn checkout. It will be
exponential slower as you add more subdirs to the base path.

Seen with a NIH customer, who switched from SFU to Cygwin with the
update to Windows 10, and is now unhappy about the slowdown.

Dan
-- 
Dan Shelton - Cluster Specialist Win/Lin/Bsd

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