Subject: Re: [xsl] alternative to repeatedly walking the ancestor axis in 1.0 From: "Vladimir Nesterovsky" <vladimir@xxxxxxxxxxxxxxxxxxxx> Date: Mon, 4 Aug 2008 06:46:41 -0700 |
> > P.S. You seems to be obsessed with an optimization of ancestor walks. > > Are you sure you have a problem in the first place? > > Obsessed is the wrong word - perhaps "mildly interested" is more > accurate - but yes I would say it's a problem to have to walk the > ancestor axis for every node. Why? It can be expensive depending on > the tree model and it prevents potential streaming optimisations. > > And of course, when the application is large enough and used by enough > people, a slight performance tweak can save a lot of money. If ancestor walks are what the profiling shows as a bottleneck then it's definitely worth for an attention. I wouldn't trusted to a feeling. Besides, I think explicit optimization can harm to an optimization that engine may perform on itself. -- Vladimir Nesterovsky http://www.nesterovsky-bros.com/
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