Re: Memoization

On Thu, Aug 22, 2002 at 03:51:28PM +0100, Gary Benson wrote:
> On Thu, Aug 22, 2002 at 08:13:21AM -0400, Daniel Veillard wrote:
> 
> >   Hum, there is no such mechanism, the only way would be to add an
> > interface to libxslt to plug-in a document cache. Note that for a single
> > transformation all the document() result are cached (this is actually
> > required by the XSLT spec), but there is no mechanism for a more global
> > cache. Could make sense, could be very small change if one doesn't
> > try to implement a default cache in libxslt itself.
> 
> I'm not trying to cache the results of transformations: each one only

  it's not what I suggested :-)
I suggested to cache the documents loaded by document() at runtime
application wide.

> happens once in my application anyway so caching would not help.  The
> problem I have is that I wrote the thing to be really easy to develop
> for first and foremost, and threw everything else out of the window.
> 
> The app in question is used to generate static HTML for inauspicious.org
> and the problem is mainly that each of the 250-odd diary entries
> requires seven files to be parsed: the huge (~350k) file containing all
> the diary entries, the XSLT file that converts one day's worth of
> entries into i.o markup and the XSLT file that converts i.o markup to
> HTML. The second XSLT file includes three more files, one of which
> parses the file full of diary entries again to create the calendar.  I
> could speed it up by rearranging it all with speed as a priority but
> that would be a lot of work and if I can simply cache documents that
> come from xmlParseFile() then that would work a treat.
> 
> Any ideas on where to start?

  Do it as a single XSLT transform using chunking to split out the various
HTML files, within a single transormation all the document used as input 
are cached in their preparsed form, i.e. all XML documents used will be
parsed only once.

Daniel

-- 
Daniel Veillard      | Red Hat Network https://rhn.redhat.com/
[email protected]  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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