On Mon, Jun 09, 2014 at 08:59:01PM +0900, Norbert Preining wrote:
> Hi Khaled,
>
> (please keep Debian bug in Cc)
>
> I already have asked Taco and Hans, but it seems that the same problem
> occurs also with xelatex, so I thought I ask you for ideas.
>
> We got a report here at Debian that context when run over xetex
> is extremely slow, which I can confirm. THe same happens with
> xelatex when loading fontspec.
>
> The test document is a simple
> \starttext
> lots of lorem ipsum in many paragraphs
> \stoptext
> or
> \documentclass{article}
> \usepackage{fontspec}
> \begin{document}
> lots of lorem ipsum in many paragraphs
> \end{document}
> and if I run this through texexec --xtx or xelatex,
> the page generation slows down, it seems there is a
> increasing delay in page generation.
>
> It is interesting that when I drop the original TeX Live (not Debian)
> xetex into our /usr/bin, then it is getting fast again.
> The difference between TL original and Debian is that we use
> shared libraries. For pure text processing the fault should be
> in harfbuzz, right? We are having 0.9.28.
>
> Do you have any ideas how to track such a bug? Do you have
> any guess where to start?
I don't really know, my Ubuntu install only have 2013 packages so I can
not do much testing myself, but I'd really be surprised if such slowness
was related to HarfBuzz (unless something really wrong is going on). My
first guess would be FontConfig, if XeTeX is asked for a font that it
can not find it might cause FontConfig regenerate its font database
which can be slow, but then again this should happen once for the whole
document which is not the case here.
Regards,
Khaled
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