Re: Texinfo 7.1 released

[Eli Zaretskii]

> From: Gavin Smith <gavinsmith0123@gmail.com>
> Date: Sun, 22 Oct 2023 18:41:34 +0100
> Cc: bug-texinfo@gnu.org
> 
> > > Surprise: running with TEXINFO_XS=omit _reduces_ the elapsed time of
> > > producing the Emacs ELisp manual from 1:21.16 to 0:36.97.
> > 
> > Another data point: running with TEXINFO_XS_PARSER=0 takes 1:34.4 min,
> > so it sounds like the slowdown is due to some XS module other than the
> > parser module.  Is there a way to disable additional modules one by
> > one?
> 
> This is most surprising, but promising that we're getting close to the
> problem.
> 
> The simplest way to disable XS modules would be to delete or rename
> the libtool files that are used for loading them.  If you run with
> TEXINFO_XS=debug, you can see which modules are loaded.  With Texinfo 7.1,
> lines like the following would be printed:
> 
> found ../tp/../tp/Texinfo/XS/Parsetexi.la
> found ../tp/../tp/Texinfo/XS/MiscXS.la
> found ../tp/../tp/Texinfo/XS/XSParagraph.la
> 
> You could then disable modules with e.g.
> 
> mv ../tp/../tp/Texinfo/XS/XSParagraph.la{,.disable}
> 
> or
> 
> mv ../tp/../tp/Texinfo/XS/MiscXS.la{,.disable}

Thanks.  Looks like the slowdown is in XSParagraph: without it, I get
21.8 sec, only slightly slower than Texinfo 7.0.3.  Disabling MiscXS
as well yields almost the same time (0.05 sec longer) as with MiscXS,
and disabling Parsetexi gets us back to 37 sec, the same as with
TEXINFO_XS=omit.

Beyond the fact that XSParagraph seems to be th culprit, I wonder why
MiscXS doesn't speed up the processing.  Is this expected?

Anyway, what's next?