on my machine running mk with a fresh cache gives the same lua mem usage as with filled cache, however a fresh run tops at 1 meg while a filled run tops ar 500 (windows vista); that document uses several cjk fonts (relatively large due to many glyphs) and script fonts (some arabic and zapfino as well as cambria math which are much larger fonts due to many features
mkiv lua stats : loaded fonts - adobesongstd-light:otf arabtype:ttf c:/windows/fonts/cambria:ttc htfs:ttf htsong:ttf ko eieletters:afm lmex10:tfm lmmi10:tfm lmmib10:tfm lmmono10-regular:otf lmmonoltcond10-regular:otf lmroman10-italic:otf lmroman10-regu lar:otf lmroman12-regular:otf lmsans10-regular:otf lmsy10:tfm lmtypewriter10-regular:otf msam10:tfm msbm10:tfm palatinoltarabic-regu lar:ttf rm-lmbx10:tfm rm-lmr10:tfm rm-lmr12:tfm rm-lmr8:tfm rm-lmtt10:tfm scheherazaderegot:ttf texnansi-lt55484:afm texnansi-lt5548 5:afm texnansi-lt55488:afm texnansi-lt55507:afm zapfinoextraltpro:otf
depends on how you use them. \font\a=simsun at 10pt and \definetypeface blablabla [simsun] are different.
mkiv lua stats : current memory usage - 361 MB (ctx: 370 MB)
You cannot depend on the memory report by mtxrun. The actual memory usage is *much* larger than the reported value. Only the one reported by the system is believable.
(keep in mind that at some point luatex has to load the glyph shapes and pass them to the pdf file so there will always be otf/pfb loading at the end of a run)
as taco mentioned, real memory usage for a fresh run is probably somewhat lower due to fragmentation
The memory usage without taking fragmentation into account has nothing to do with the user's experience. With 1G memory on my machine, and the best memory allocation implementation I can find (The FreeBSD operating system's memory allocation algorithm is very efficient. Firefox 3 also uses its implementation). In order to use ConTeXt with 4 chinese fonts, I should - First, quit Firefox, Gnome and X Window - Run sudo shutdown now and log into the single user mode - Run context foobar.tex, when finishing dumping the first Chinese font's font cache, press control + C, and run that again for the second font. And that's my experience. If I don't do that, the swap will be caching for several minutes, and finally the kernel stopped the luatex program since it uses too much memory.
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