On 11/30/2023 7:32 PM, Andreas Scherer wrote:
Dear all,
While working on next year's 'knuth-pdf' package
(https://ctan.org/pkg/knuth-pdf) I have noticed that LuaTeX is the one
PDF engine that revs up the fan of my laptop more than the others.
Running 'time makeall' (see
https://mirrors.ctan.org/web/pwebmac/makeall) gives the following
results (second run each):
$ time makeall -npt xetex
real 1m2,738s
user 1m7,745s
sys 0m8,641s
[$ wc -c *.pdf -> 30355436 total]
$ time makeall -npt pdftex
real 0m53,242s
user 0m53,042s
sys 0m2,140s
[$ wc -c *.pdf -> 40045111 total]
$ time makeall -npt luatex
real 1m15,286s
user 1m13,728s
sys 0m3,615s
[$ wc -c *.pdf -> 44176632 total]
Just an observation.
So (just a remark),
pdftex 53 sec 8 bit input, 8 bit fonts
xetex 63 sec utf input, wide fonts
luatex 75 sec utf input, wide fonts
Given the 53 sec which is quite some for a pdftex run, luatex is not
doing that bad. On pure text runs luatex with open type fonts can be
three times slower, and depending on circumstances xetex can be faster
than luatex (so that metric looks ok compared to the others).
Of course there are scenarios where luatex can be faster. Anyway,
unicode and wide fonts have impact on the parsing of input, memmory
usage, font handling, language processing, backend etc.
Hans
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