[luatex] slower texlua at LuaTeX 1.0.4 (TL 2017) ?

[Hans Hagen]

On 6/2/2017 2:33 PM, jfbu wrote:

> my findings are ont reproduced on a Linux Box:
> 
> typically:
> 
> $ time /pathto/texlive/2016/bin/x86_64-linux/texlua collatz.lua 1 1000000
> 837799
> 
> real	0m23.755s
> user	0m23.720s
> sys	0m0.000s
> 
> 
> and
> 
> $ time /pathto/texlive/2017/bin/x86_64-linux/texlua collatz.lua 1 1000000
> 837799
> 
> real	0m21.094s
> user	0m21.080s
> sys	0m0.000s
> 
> 
> I don't have an independent Lua interpreter installed here.
> 
> And although timing varies up to 10%, it seems to the contrary the
> TL2017 version is a bit faster here.
> 
> (TL2016 fully updated, TL2107 pretest fully updated)
> 
> I would be interested to here about other architectures.
> 
> Perhaps there is a special problem with x86_64-darwinlegacy ?
> 
> Should I move the thread to texlive ?
Some observations:

luatex mingw windows 64 bit  : 14.1
texlua native windows 64 bit : 13.8 (tex live version)
lua    native windows 64 bit : 13.6 (tex live version)
lua 5.1.4                    : 29.4 (luaforwindows)
lua 5.1.5                    : 38.3 (luaforwindows)

lua 5.2.4 bash on windows    : 15.5
luatex bash on windows       : 15.6

It probably all depends on optimization flags (and cpu cache and such) 
... as I do quite some performance tests I'd immediately notice if there 
was some mess up in the lua embedding in luatex (definitely if it were a 
factor 2). I actualy expect lua 5.3 to be somewhat slower than 5.2.

Now, as you want speed (for that kind of times probably not a good idea 
to do that runtime), you'd better optimize your lua code as without 
knowing what this code does (so i can be wrong), i can gain 40% without 
problem.

Hans

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