Am 12.09.2008 um 16:30 schrieb Yue Wang:
> Hi:
>
> The following cases all use second run of context. So there is no font
> cache time. I use a new installed Windows XP SP3 on a Core 2 Duo
> 1.68GHz with 1GB mem machine. Only TeXWorks and ConTeXt are installed
> and running on the machine. I close all pre-installed software (like
> MSN, IE, etc.) and leave all extra memory for LuaTeX.
>
> Only 3 big chinese font, AdobeSongStd-Light, AdobeHeitiStd-Regular,
> AdobeKaitiStd-Regular are loaded. However, different approaches have
> different runtime, here, two cases are tested (zhfonts is attached in
> the mail):
All times for a normal ConTeXt run (2 runs) without intermediate from
a former run on a MacBook (2GB mem, 2.4 GHz).
> \usetypescriptfile[zhfonts]
> \usetypescript[myfont]
> \setupbodyfont[myfont,rm,11pt]
> \starttext
> 你好 {\it 你好} {\bf 你好}
> \stoptext
> MtxRun | total runtime: 194.156
MtxRun | total runtime: 17.996
> \definefontfeature[zh][mode=node, script=hang, lang=zhs]
> \definefontsynonym[song][AdobeSongStd-Light][features=zh]
> \definefont[song][song at 12pt]
> \definefontsynonym[hei][AdobeHeitiStd-Regular][features=zh]
> \definefont[hei][hei at 12pt]
> \definefontsynonym[kai][AdobeKaitiStd-Regular][features=zh]
> \definefont[kai][kai at 12pt]
> \starttext
> {\song 你好}{\hei 你好}{\kai 你好}
> \stoptext
> MtxRun | total runtime: 13.797
MtxRun | total runtime: 8.930
> This also applies to file which only one big font, AdobeSongStd-Light,
> is used, two cases are tested:
>
> \definefontfeature[zh][mode=node, script=hang, lang=zhs]
> \definefontsynonym[song][AdobeSongStd-Light][features=zh]
> \definefont[song][song at 12pt]
> \definefontsynonym[hei][AdobeHeitiStd-Regular][features=zh]
> \definefont[hei][hei at 12pt]
> \definefontsynonym[kai][AdobeKaitiStd-Regular][features=zh]
> \definefont[kai][kai at 12pt]
> \starttext
> {\song 你好}
> \stoptext
> MtxRun | total runtime: 5.609
MtxRun | total runtime: 4.820
> \usetypescriptfile[zhfonts]
> \usetypescript[myfont]
> \setupbodyfont[myfont,rm,11pt]
> \starttext
> 你好
> \stoptext
> MtxRun | total runtime: 135.125
MtxRun | total runtime: 16.326
> If no Chinese fonts are used, three cases are tested:
> \usetypescriptfile[zhfonts]
> \usetypescript[myfont]
> \setupbodyfont[myfont,rm,11pt]
> \starttext
> Hello
> \stoptext
> MtxRun | total runtime: 89.938
MtxRun | total runtime: 14.940
> \starttext
> Hello
> \stoptext
> MtxRun | total runtime: 2.594
MtxRun | total runtime: 2.902
> \definefontfeature[zh][mode=node, script=hang, lang=zhs]
> \definefontsynonym[song][AdobeSongStd-Light][features=zh]
> \definefont[song][song at 12pt]
> \definefontsynonym[hei][AdobeHeitiStd-Regular][features=zh]
> \definefont[hei][hei at 12pt]
> \definefontsynonym[kai][AdobeKaitiStd-Regular][features=zh]
> \definefont[kai][kai at 12pt]
> \starttext
> Hello
> \stoptext
> MtxRun | total runtime: 2.734
MtxRun | total runtime: 2.892
> In a typical chinese science book, usually 4 to 10 chinese
> truetype/opentype font are used. Magazines might use twenty or more.
> So if we want to use the standard way (use chinese font as body font,
> use virtual fonts mechanism to mix the font with latin fonts, use
> different alternatives for single chinese font)
> as the zhfonts.tex is presented, the running time here is usually
> intolerable (more than 3 minutes' loading time with very simple text
> for three fonts).
Enable \preloadtypescript in cont-sys.tex.
> A simple XeLaTeX file with three font embeding using XeCJK or
> zhspacing for interchartoken font switching usually runs less than 8
> seconds. In this case, all the family (rm, ss, tt) parts (like bf, it,
> etc) in NFSS are defined.
>
> So, I think there should be a way to improve the font loading
> procedure. Maybe we had made deep copy to every fontsynonym defined
> here which made the loading time terribly long? Are there some way to
> mirror all the unchanged part of a new loading font B from a loaded
> time A and only leave the modified table when A and B points to same
> physical font? Thanks.
>
> Yue Wang
Wolfgang
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