Bug#750785: Slowness with context and xetex

On Sun, Aug 10, 2014 at 11:17 PM, Norbert Preining <preining@logic.at> wrote:

Hi Behdad,

thanks for your answer, and looking into it.

On Sun, 10 Aug 2014, Behdad Esfahbod wrote:
> Not without more context (haha).

I can give more context, easily, but I need some explanation
on *how* to print out information concerning
hbFace

Just print the pointer. We expect one instance per font file. If you see them change all the time, bug somewhere else.

segment_props

It's a public struct of script (an enum), direction (an enum), and language (a pointer). All of those have _to_string() functions, but again, just print as integers.

engine-features

Normally we expect engine->nFeatures to be zero. Even if it's not, the feature struct is simple and open, and has a to_string() function too. It's an array of length engine->nFeatures.

(the other two are ints and string, so easy).

Last one is not an string, it's a NULL-terminated array of strings.

> Print out the parameters being passed in to that function and we'll definitely
> see why the cache isn't working.

I will try, I am now digging throught he headers of harfbuzz to see
how to print such beasts.

> Also a simple test document is appreciated. I'm cloning XeTeX now. Will see
> how a build goes...

Mind the following:
* it does *NOT* happen when xetex is compiled with a static harfbuzz lib
* I only could check, but it happens when compiling xetex with
Debian sid and testing's harfbuzz library as shared lib.

Ok, best that you get that printout first then.

behdad

THe test document is trivial:
\documentclass{article}
\usepackage{fontspec}
\begin{document}
lots of lorem ipsum in many paragraphs
\end{document}

So there needs to be long long text.

All the best

Norbert

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PREINING, Norbert http://www.preining.info
JAIST, Japan TeX Live & Debian Developer
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behdad
http://behdad.org/