Re: XeConTeXt bug report I: strange benchmark

[Hans Hagen <pragma@wxs.nl>]

Yue Wang wrote:
> Thank you, Taco.
> 
> currently I found one way to speed up font loading:
> 
> \synchronizemathfontsfalse
> \let\synchronizetext\relax
> \starttypescript[serif] [myzhfont]
>  \definefontsynonym [Serif]           [file:SimSun]
> \stoptypescript
> \definetypeface [myzhfont] [rm] [serif][myzhfont]   [default]
> \def\a{\myzhfont}
> \dorecurse{10000}{{hello {\a 你好}}\par}
> \bye

as wolfgang already pointed out, if you want fast fonts you should
define them directly using \definefont

if you disable bits and pieces of the setupbodyfont mechanism you will
eventually run into problems, for instance because \tfd etc are not
defined and your chapter titles etc will behave unexpected (sizes as
well as when mixed with math)

in a regular document you only set up the bodyfont once (not 10000
times) and then use \bf, \sl, \itc etc which are pretty fast

> TeXExec | runtime: 10.172
> much faster, but still far slower than \definefont.
> 
> this reminds me another possible bug in ConTeXt:

as mentioned ... we're no talking bugs here but 'features' and side
effects of them

> 
> Test1:
> 
> \definetypeface[iwona][ss][sans] [iwona] [default]
> \definetypeface[iwona][mm][math] [iwona] [default][text=ss]
> \setupbodyfont[iwona]
> \starttext
> foobar
> \stoptext
> 
> runtime= 6.625. There is a 5 seconds pause after loading
> (c:/context/tex/texmf-context/tex/context/base/spec-xet.tex)
> 
> But I don't know what xetex is loading.

fonts (like the sans and more noticeably math (6 families * 3 sizes = 18
fonts at least)

> Test 2:
> 
> \definetypeface[iwona][ss][sans] [iwona] [default]
> %\definetypeface[iwona][mm][math] [iwona] [default][text=ss]
> \setupbodyfont[iwona]
> \starttext
> foobar
> \stoptext
> 
> I only comment the math defination line. now
> runetime = 0.969

right .. and as context is supposed to do math (keep in mind that some
symbols come from math anyway) this is expected

> Test 3:
> 
> move the three lines to context.rme,
> \definetypeface[iwona][ss][sans] [iwona] [default]
> \definetypeface[iwona][mm][math] [iwona] [default][text=ss]
> \setupbodyfont[iwona]
> then rebuild the format.
> note we also load the math font. but one thing is clear: Hans said
> unlike plain TeX and LaTeX, font tfm is not dumped into ConTeXt
> format.

well, in this case you probably *did* force them in format; the normal
default font (lm) is not in the format and loading is delayed

> However, at this time we compile
> \starttext
> foobar
> \stoptext
> 
> runtime =0.875
> 
> I don't know the reason for this problem too....
> I think XeTeX load math tfms quite fast. (it should be even faster
> than otf loading, but in xecontext, this is not true).

more needs to be set up ... not only fonts, + some testing + ...

just do a \tracingall before setupbodyfont and you will see

Hans

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                                          Hans Hagen | PRAGMA ADE
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