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Date:	Mon, 18 Dec 2023 07:53:11 +0100
Message-ID:	<CAAvCNcBAiype=Ejrw_z+VMttzEawD3OuUWMW_Ys6AcHKGpVSRw@mail.gmail.com>
Subject:	Re: Catastrophic Cygwin find . -ls, grep performance on samba share
	compared to WSL&Linux
To:	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 Mon, 18 Dec 2023 at 07:49, Marco Atzeri via Cygwin <cygwin AT cygwin DOT com> wrote:
>
> On 18/12/2023 07:22, Dan Shelton via Cygwin wrote:
> > On Wed, 6 Dec 2023 at 05:08, Dan Shelton <dan DOT f DOT shelton AT gmail DOT com> wrote:
> >>
> >> Hello!
> >> I am unhappy to report a severe performance issue with find -ls, ls -R
> >> and grep -r, with Cygwin 3.4.9 and Cygwin 3.5.0 when samba shares are
> >> involved.
> >>
> >> Imagine a directory with 256 subdirs, and each has 256 files per
> >> subdir, all on a samba share, samba server is on Linux with tmpfs.
> >>
> >> mkdir dir1
> >> for ((i=0;i<256;i++)) ; do
> >>      mkdir "dir1/subdir$i"
> >>      for ((j=0; j < 256;j++));do
> >>          echo  "j=$j" >"dir1/subdir$i/j$j.txt"
> >>      done
> >> done
> >>
> >> Time comparisations then show a dramatic difference, Debian Linux
> >> accessing the samba share, WSL accessing the samba share, and Cygwin
> >> accessing the samba share:
> ..
> >> Why does that happen?
> >
> > It would be nice if someone from the Cygwin authors could assist me in
> > figuring out why this happens.
> >
> > My working theory is that the extra file and dir lookup calls are for
> > soft- and hardlink emulation for file systems which do not have soft-
> > or hardlinks?
> > If this is correct, then a fix might be to 1) determinate the
> > filesystem type (cached, per process lifetime in absence of
> > /etc/mnttab) and its boundaries (mount point, and whether other muont
> > points are below it) 2) Only use the emulation for FAT filesystems,
> > and for NTFS, REFS, SMBFS the native filesystem link is used.
> >
> > Help!
> >
> > Dan
>
> Is your cygserver running ?

Yes, Cygserver is running

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

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