[libvirt] Re: [augeas-devel] PATCH: Add a augeas lens for libvirtd.conf

[David Lutterkort <lutter redhat com>]

On Tue, 2008-08-26 at 22:01 +0100, Daniel P. Berrange wrote:
> > While I can see why it is useful to gather these entries logically, it's not
> > very optimised for the parser. Eventually, all this will be compiled into a
> > huge regexp, so it's more efficient to regroup entries by type and feed the
> > functions with regexps instead of strings, like
> 
> Is performance really that much of a problem ?  The libvirt config file
> only has 20 or so different settings, and while we'll add more I can't
> see it getting very much larger.  Changing these settings is also not
> something that would be done on a frequent basis / performance critical
> path.  I find it more readable to group them by functional area unless
> there is a serious real world performance issue.

We've seen some cases where it made a _dramatic_ difference. But if it's
fast enough now, I wouldn't worry about it - just keep that in mind when
either running augparse or augtool on it becomes unbearably slow.

David