On 8/5/2021 10:01 AM, jfbu wrote:
Le 5 août 2021 à 09:50, jfbu <[email protected] <mailto:[email protected]>> a
écrit :
% pdftex
with (total): 5.34964pt
without (total): 5.45686pt
with minus without: -0.10722pt
with (total): 5.55394pt
without (total): 5.61536pt
with minus without: -0.06142pt
with (total): 5.35501pt
without (total): 5.3827pt
with minus without: -0.0277pt
% luatex
with (total): 6.08586pt
without (total): 6.30107pt
with minus without: -0.21521pt
with (total): 6.06969pt
without (total): 6.35312pt
with minus without: -0.28343pt
with (total): 6.11238pt
without (total): 6.37778pt
with minus without: -0.2654pt
I had accidentally TEXMFCNF set in my environment (from previous tests).
Testing some more with this environment variable of TeXLive unset, I
get completely different results.
% pdftex
with (total): 5.46095pt
without (total): 5.43422pt
with minus without: 0.02673pt
% luatex
with (total): 6.10898pt
without (total): 6.03908pt
with minus without: 0.0699pt
And re-setting it (to "$(pwd)") I reproduce again typically the above
results...
i.e. with TEXMFCNF set its is advantageous to use \romannumeral,
both with pdftex and with luatex.
with TEXMFCNF not set, it is disadvantageous...
... that’s highly baffling to me !
I repeated quite a few times to make sure timings are consistent,
it seems with luatex it is, with pdftex less so
ok, I don’t want to induce people to lose time on ill-conceived test
one thinkg that you need to keep in mind is the size of the texmf tree
in context we don't use kpse so we don't suffer much from the size of
the tree (it was actually oen of the first thing i did in mkiv/luatex,
some 15 years ago: replace kpse with a lua variant)
when you use kpse (pdftex, luatex etc with latex) these lsr files are
loaded and hashed, that takes time
then, when you add a local tree (e.g. home) that one gets scanned every run
so, in a tex live setup: the more files, the longer the start up time
a context installation (from the garden) is rather small compared to
texlive, and an lmtx installation even smaller (most is documentation
and fonts) .. over the year i've spend a lot of time making the user
experience such that on the average a run is ok (on my 2013 laptop lmtx
start up time is < .5 sec which includes dealing with all (some) 500 lua
modules
i have no clue about latex overhead as i never run that (one of the
persistent naratives is that latex is way faster than context but i'm
not really sure about that)
most tex performance test are rubish ... one can test "test\par" or
"test\page" a thousand times but what does it say ...
\starttext \testfeatureonce{1000}{test\par} \stoptext
system > feature test done: 1000 steps, 0.090 seconds,
0.000089939 per step
mkiv lua stats > runtime: 0.542 seconds, 25 processed pages, 25 shipped
pages, 46.125 pages/second
\starttext \testfeatureonce{10000}{test\par} \stoptext
system > feature test done: 10000 steps, 0.907 seconds,
0.000090726 per step
mkiv lua stats > runtime: 1.370 seconds, 244 processed pages, 244
shipped pages, 178.067 pages/second
\starttext \testfeatureonce{10000}{\null\page} \stoptext
system > feature test done: 10000 steps, 12.509 seconds,
0.001250932 per step
mkiv lua stats > runtime: 13.487 seconds, 10000 processed pages, 10000
shipped pages, 741.441 pages/second
\starttext \testfeatureonce{1000}{\samplefile{tufte}\page} \stoptext
system > feature test done: 1000 steps, 4.290 seconds,
0.004290208 per step
mkiv lua stats > runtime: 4.815 seconds, 1000 processed pages, 1000
shipped pages, 207.703 pages/second
now all this is not realistic: kick in some color, fonts, graphics,
advanced structuring and in the end 20-30 pps is what one gets
(maybe on a modern machine twice that)
add some tikz and one can drink a coffee
in the end using an ssd, more memory (caching) had more impact than cpu
bosts
(ok, i made the luametatex mem footprint much smaller than the luatex
one but that's more for raspbery pi and such ... on that we run some 3
times slower than on my intel laptop .. more a pet project)
Hans
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