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X-HELO: calimero.vinschen.de
Date: Tue, 14 Apr 2015 20:23:10 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Making Cygwin More Tolerant of Orphaned SIDs?
Message-ID: <20150414182310.GR7343@calimero.vinschen.de>
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On Apr 14 12:44, Bryan Berns wrote:
> On Tue, Apr 14, 2015 at 10:53 AM, Corinna Vinschen
> <corinna-cygwin AT cygwin DOT com> wrote:
> > On Apr 14 07:24, Bryan Berns wrote:
> >> For example, I create a whole bunch of files (like 5000),  I use
> >> icacls to append a new ACE.  Then I do a 'time ls -l
> >> /cygdrive/c/somedir/*'.  Takes four seconds.  In the same Cygwin
> >> session, I remove the local group (net localgroup testgroup /delete).
> >>  I do the same 'time ls -l /cygdrive/c/somedir/*'.  Takes 20 seconds.
> >> Subsequent runs in the also take 20 seconds.  Since I'm able to
> >> continue to see the slowdown in the same session, cygserver wouldn't
> >> help right?
> >>
> >> Is the above expected?
> >
> > Yes.  Without cygserver, caching only works from parent to child proces=
s.
> > One run of ls can't cache data for a parallel run of ls in trhe same
> > session.  As, btw., explained in the documentation:
> >
> >   https://cygwin.com/cygwin-ug-net/ntsec.html
>=20
> Alright, I'll give it a shot when I get back to my lab.  I suspect it
> shouldn't take an additional 16 seconds to attempt to lookup account
> information (and fail) on my two node test network so I'm curious how
> much this will cut the time by.
> If I setup cygserver with all the --no options set (reference:
> https://cygwin.com/cygwin-ug-net/using-cygserver.html) since I don't
> want any accidental cross-user information sharing, will that
> effectively only provide the SID caching functionality or is there
> other functionality to be wary of?

You don't have to disable anything.  Just don't set the debug option
to avoid logging passwd entries.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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