Studio: LuaJIT

MikeHart · December 2011

Hi gideros team,

if it fits into the gideros engine and won't cripple the flexiblity that gideros/LUA has, I would love to see that LuaJIT would be supported. But only, when you guys have nothing else to do.

http://luajit.org/index.html

Cheers
Michael

atilim · December 2011

I'm also very impressed with LuaJIT and waiting the version 2.0 to move out of beta to do some tests on iOS

But only the interpreter mode of LuaJIT can be run on iOS because of the restrictions from Apple (to be more detailed, mprotect function cannot be used). For example, go http://luajit.org/performance_arm.html and select "Lua 5.1.4" with "LuaJIT 2.0.0-beta9 (interpreter)". This will be the speedup on iOS (on average 3x).

Here is an another explanation from Mike Pall (http://luajit.org/install.html):
"Note: the JIT compiler is disabled for iOS, because regular iOS Apps are not allowed to generate code at runtime. You'll only get the performance of the LuaJIT interpreter on iOS. This is still faster than plain Lua, but much slower than the JIT compiler. Please complain to Apple, not me. Or use Android. :-p"

MikeHart · December 2011

Ah, i didn't know this. Good to know.

Artiom · February 2012

+1 for LuaJIT!

If you make it - it'll be awesome. Android version of engine will be faster.. but whatever. Absolute speed of engine will be increased and that's the good reason to use LuaJIT.

I hope you will create the fastest lua engine in the world

GregBUG · February 2012

yeah! i love to see this too. :P
although gideros'lua byte code is already very, very fast!

katze · April 2012

Im also very happy with the performance of Gideros, but the more the betther

Maybe it could be an Option, at least for the android devices, since there also alot of cheap android devices out with not so much cpu power, for them this could be a good option.

GregBUG · April 2012

+1 for katze

Michal · April 2012

+1 for luaJIT. BTW, luajit2 (even if still called "beta") is at least as stable as v 1.x. And while it is still faster, you get bitop library for free (not sure about FFI - would that work on iOS?).

atilim · April 2012

It works on iOS in interpreter mode (and FFI works on iOS also)

zakkwylde · August 2012

Hi,

I would like to see this also pushed forward. This is close to comming out of beta soon and It would be good for a build the community can use (if they want to) to assist in testing so when 2.0 is offically release bam straight into production.

Please.

Z

Nascode · August 2012

If Gideros integrate LuaJIT, what i could see is total epic awesomeness for sure. Even Gideros could be promoted as using LuaJIT internally, that means really fast lua scripting engine.

bhou · January 2013

LuaJIT 2.0.0 was officially released last November. How is the integration into Gideros? Can't wait to try it!

)

SinisterSoft · January 2013

@atilim Having LuaJIT would be good (interpreter on iOS, selectable interpreter or JIT on Android) extra speed and bit operations would be handy if free. Please don't say you're waiting for 3.0 now...

atilim · January 2013

@SinisterSoft You're right. I'll start to integrate it at the first opportunity. Sometimes bugs are reported to LuaJIT's email forum but I think it's really stable now.

For example on iPad 3, when there are lots of small sprites moving around, Lua starts becoming the bottleneck instead of graphics drawing. With the introduction of powerful mobile GPUs, now I think LuaJIT becomes more important.

ar2rsawseen · January 2013

@atilim you must be in great mood, lots of awesome promises lately

atilim · January 2013

@ar2rsawseen 2013 will be looong year

bhou · January 2013

@atilim Besides LuaJIT, there is another candidate to improve the lua performance, llvm-lua. It does AOT (Ahead-of-Time) compiling and supports more platforms/architectures (X86, ARM, PPC) than LuaJIT. AFAIK, rubyMotion use LLVM to compile ruby to machine code for performance improvements. In case you have not started to integrate LuaJIT, what do you think about llvm-lua?

SinisterSoft · January 2013

I've read some of the comments online and LuaJIT looks like it's currently better than llvm-lua as it's specific to Lua (llvm-lua is much more general - at least the llvm bit is).

bhou · January 2013

@SinisterSoft
It is interesting that today I saw a thread in lua mail list about the comparison between LuaJIT and llvm-lua. It seems that llvm-lua still have its advantages (although not in speed). I remember that I have seen another thread, in which mentioned that llvm-lua is 2 or 3 times faster than lua, while LuaJIT is 2 or 3 times faster than llvm-Lua.

The point is that LuaJIT might be banned by iOS, or can only run interpreter mode (which is also 2 or 3 times faster than lua). In this case, its speed is comparable to llvm-lua without the llvm benefits.

Any way, integrating LuaJIT or llvm-lua will both be a good thing for Gideros. : )

SinisterSoft · January 2013

LuaJIT is my first choice, a choice between them by second, just llvm-Lua my third...

SinisterSoft · January 2013

@atilim Have you seen this:

https://github.com/creationix/brozula/

Might make html5 fairly easy once you have added LuaJIT ?

atilim · January 2013

@SinisterSoft whoa. interesting. I hope he will continue to develop it.

He made a good choice with LuaJIT's bytecode because it's more capable then Lua's bytecode and LuaJIT's bytecode is portable and can be loaded on any architecture independent of word size or endianess.

zakkwylde · March 2013

Hi,
not sure if we could do this. Would an export option be possible to allow LuaJit for android only? Just becasue apple does not allow it's use, does not mean we should be held back.

Comments?

hgvyas123 · March 2013

+1 for android and other upcoming platforms

Nascode · March 2013

@zakkwylde LuaJit simply would not do Jit-ing on iOS. On Android LuaJit in some case should be faster because of Jit thought

atilim · March 2013

When we start to use LuaJIT:
On iOS, you can expect x2-x3 speedup because of specialized interpreter developed for ARM.
On Android, you can expect x20 speedup because of jit-ing.

http://luajit.org/performance_arm.html

phongtt · March 2013

Wow wow. So when? :-w

GregBUG · March 2013

=P~

as soon as @atilim implement LuaJit in Gideros
i *renew* my Gideros Subscription!!!

hgvyas123 · March 2013

x20 speedup whooooooo cant wait

ar2rsawseen · March 2013

[troll on]
That way we will have 60x20 = 1200 frames per second

[troll off]

alexzheng · April 2013

I did a very simple test with lua luajit and gideros lua, here is the result

print(os.clock())
local t = {}
for i = 0 , 10000000 do
	t[i] = math.random(100)
end
print(os.clock())

zhengyi:tmp zhengyi$ lua main.lua
0.001993
1.652817
zhengyi:tmp zhengyi$ luajit main.lua
0.0018
0.245468

and gideros lua
Uploading finished.
170.259984
172.936773

it seems gideros take more CPU time than normal lua.

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