Testers needed: New passwd/group handling in Cygwin
Corinna Vinschen
corinna-cygwin@cygwin.com
Fri Feb 28 12:09:00 GMT 2014
On Feb 28 03:12, Andrey Repin wrote:
> Greetings, Corinna Vinschen!
> > While we're at it, I just had this weird idea.
>
> > What if, as soon as the first Cygwin process in a process tree starts,
> > this process not only caches the primary group info, but also caches all
> > supplementary groups from the user's token? This would slow down
> > startup of the first process slightly, but it would speed up any
> > subsequent request for group information of a group in the user's token.
> > An `id' call would be almost instant, and `ls' calls would probably be
> > faster as well.
>
> Umhm. I'd have to see, how slightly. Because my primary use of Cygwin tools
> does not expect to have a parent Cygwin process. (I.e. diff'ing between
> file manager panels.)
>
> > As always, there's a trade-off: Users running cygwin processes from CMD
> > a lot would encounter a slowdown.
>
> > What do you think, guys?
>
> Needs some tests. I would certainly appreciate faster initial startups, but if
> the delay is manageable, I can cope with more long-term friendly approach.
> I've got entangled in current work and lost track of snapshots for now.
> If there's some DEF's in library, that I can toggle and rebuild it with certain
> features enabled and disable for local test, I'd be glad to have a round at it
> over weekend.
I've just uploaded a new snapshot to http://cygwin.com/snapshots/
It allows you to do the following in /etc/nsswitch.conf:
db_cache: no
No caching of passwd and group data at all
db_cache: yes
Caching of passwd and group data, no initial caching of the user's
supplementary groups from the user token.
db_cache: full
This is the default now.
Caching of passwd and group data *plus* initial caching of all groups
from the user token.
Please try it out. Average timings from your environment (process
startup, and calling `id') would be nice.
Thanks,
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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