Le 24/02/2011 10:33, Stephan Hennig a écrit : > schrieb Mojca Miklavec: > >> They are not held in memory at all (the synonyms are), they are >> loaded on demand. However in XeTeX they are (the same patterns are >> first loaded as ngerman and then as dehyphn-x-2009-06-19; once from >> out package and once from yours). > > That is interesting. With LuaTeX being able to load patterns at > run-time, there are now three different pattern loading strategies > possible (that I can think of): > > 1. Load all patterns in the format. > > 2. Load all patterns unconditionally at start-up, but only > after loading the format. > > 3. Load requested patterns on demand. > I'm afraid "load" is too imprecise to precisely describe what happens with LuaTeX. There are now two possibly distinct operations: a. read the patterns (as a string of characters) b. process them into a form usable by *TeX (a trie)
With LuaTeX you have two options: 1. Read all patterns at initex time and store them as a string of characters in the format; process them all at startup when the format is loaded. 2. Read and process requested patterns on demand. Option 1 was used up to TeX Live 2009 and resulted in a long startup time. Option 2 is implemented since TL 2010. > Strategy 2 would already decouple patterns from the format and be a step > into the direction of strategy 3. My impression was (for whatever > reason), that lualatex uses strategy 2 or at least it did once. Sort of. I think it's better to use "read" and "process" rather than "load" to accurately describe what happens. > Is it > really true that, now, lualatex loads only requested patterns on demand, > that is, it uses strategy 3? > Yep. > (Hm, is that what Manuel did before the TL 2010 release? I'm surely not > following your efforts closely enough.) > Yep. Now the next step is about babel: currently languages are statically allocated (declared) in the format, and then defined (= loading the patterns) on demand. It would be better to be able to dynamically declare languages at runtime. It shouldn't be too complicated to do, I hope to get to it soon. Manuel.
