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X-HELO: calimero.vinschen.de
Date: Fri, 22 Jan 2016 21:14:18 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Performance of "ls -F"
Message-ID: <20160122201418.GC3268@calimero.vinschen.de>
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References: <loom DOT 20160121T163405-489 AT post DOT gmane DOT org> <CAH5rLZVWiGz2n-3Ru-C0_5KU-Cc4NipJPn1NQVphN2UetUK4iA AT mail DOT gmail DOT com> <3a9ff6ec2d5e4e64a96a8f8e31d12f22 AT ntmaexbe04 DOT bedford DOT progress DOT com> <loom DOT 20160122T082744-501 AT post DOT gmane DOT org>
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On Jan 22 07:30, Achim Gratz wrote:
> Bill Smith <bsmith <at> progress.com> writes:
> > The difference is 1.3 seconds versus 1 minute 7 seconds.  The directory=
 is
> identical on the two NetApps and
> > they both contain ~29K files.  C-dot (Cluster Data On Tap) is the newest
> operating system for the NetApp.  It
> > also supports the newer SMB protocols.
> >=20
> > I also tried the experiment with MKS Toolkit 8.6 and in both cases, it
> takes around .1 seconds.
>=20
> Could you please show the result for running /usr/lib/csih/getVolInfo on =
the
> two directories?

Just a hint:  ls -F requires to stat every single file.  stat in turn
requires to load not only the usual metadata but also to fetch the ACL
and convert it to POSIX permissions.  If the ACL hasn't been created
with Cygwin 2.4.0, an additional number of AuthZ calls might be
performed with the number of calls =3D=3D the number of different user
accounts in the ACLs of all files.  Which means, there are quite a few
packages going over the network.  Assuming this slow access only occurs
under 2.4.0, this might be one of the reasons to allow the user to
disable Authz processing (you have been warned, yada yada).  If that's
*not* the problem, we certainly need more details.  Like debugging
results to find out where the time is spent.


Corinna

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Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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