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我如何才能检索当前定义的宏的数量？

tag-icon • tag-icon tex-core memory
我如何才能检索当前定义的宏的数量？

以下操作将耗尽 TeX 的最大内存：

% arara: pdftex
\nonstopmode
\input expl3-generic \relax \ExplSyntaxOn

\int_zero:N \l_tmpa_int
\int_while_do:nn { \l_tmpa_int < 490000 }
  {
    \cs_new:cn { temp \int_use:N \l_tmpa_int : } { nothing }
    \int_show:N \l_tmpa_int
    \int_incr:N \l_tmpa_int
  }
hi
\bye

给出错误

! TeX capacity exceeded, sorry [number of strings=494671].

在 489008 个定义之后。（我假设剩余的约 5k 个定义来自内核和格式。）

我假设这个数字可以在某个配置文件中找到（对于构建 TeX 的“巫师”），但我如何才能number of strings=从 TeX 内部动态获取这个数字呢？

sh-3.2$ cat temp-file--8751S9O.tex
hi \bye
sh-3.2$ tex temp-file--8751S9O.tex >/dev/null
sh-3.2$ cat temp-file--8751S9O.log
This is TeX, Version 3.14159265 (TeX Live 2015) (preloaded format=tex 2015.5.24)  26 JUL 2015 09:34
**temp-file--8751S9O.tex
(./temp-file--8751S9O.tex [1] )
Output written on temp-file--8751S9O.dvi (1 page, 208 bytes).
sh-3.2$

答案1

如果我继续pdftex跑

\tracingstats=1 \bye

日志文件将报告

Here is how much of TeX's memory you used:
 2 strings out of 494671
 95 string characters out of 6148970
 14212 words of memory out of 5000000
 1670 multiletter control sequences out of 15000+600000
 14794 words of font info for 50 fonts, out of 8000000 for 9000
 1420 hyphenation exceptions out of 8191
 1i,0n,0p,1b,6s stack positions out of 5000i,500n,10000p,200000b,80000s

如果我运行它

\tracingstats=1 \input expl3-generic \relax \ExplSyntaxOn \bye

我明白了

Here is how much of TeX's memory you used:
 6750 strings out of 494671
 132558 string characters out of 6148970
 103191 words of memory out of 5000000
 8405 multiletter control sequences out of 15000+600000
 14794 words of font info for 50 fonts, out of 8000000 for 9000
 1420 hyphenation exceptions out of 8191
 22i,0n,31p,10374b,291s stack positions out of 5000i,500n,10000p,200000b,80000s

expl3因此，通过比较空文件和有文件的文件，您就可以了解内存的负载是多少\input expl3-generic。

运行仅在开头添加的测试文件\tracingstats=1时，我收到错误

! TeX capacity exceeded, sorry [number of strings=494671].

日志文件显示

Here is how much of TeX's memory you used:
 494671 strings out of 494671
 5388582 string characters out of 6148970
 4493699 words of memory out of 5000000
 496323 multiletter control sequences out of 15000+600000
 14794 words of font info for 50 fonts, out of 8000000 for 9000
 1420 hyphenation exceptions out of 8191
 23i,0n,31p,10361b,291s stack positions out of 5000i,500n,10000p,200000b,80000s

如果指令中的替换文本\cs_new:cn较长，内存会更快耗尽。

TeX 运行期间无法获取有关内存的信息。LuaTeX 中不存在此限制，请参阅手册中有关该status库的 4.13 节。

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