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Luau's performance

90 points by todsacerdoti

by Rochus

2 subcomments

Here are some measurement results based on the Are-we-fast-yet benchmark suite: https://github.com/rochus-keller/Are-we-fast-yet/blob/main/L...
Luau in interpreter mode is pretty much as fast as LuaJIT 2.1 in interpreter mode.
Luau with (partial) native compilation is factor 1.6 slower than LuaJIT 2.1 in JIT mode. I used Luau with the -g0 -O2 --codegen options (didn't add --!native to the code though), which according to my understanding automatically selects the "profitable" functions for native compilation.

by le-mark

2 subcomments

I’ve always been curious how Roblox games are deployed and managed. Is each instance of a game executed in a docker container, and the luau code isolated that way or is there some multi-tenant solution?

by bjoli

0 subcomment

It is obviously a choice why isn't done, but with static modules you can know whether * is overloaded. That will improve procuedure calls by a lot, almist always. sure, with polymorphic finctions you can get a bit of the way using inline caches, but in my experience knowing the callee is always going to be a speedup.

by bstsb

0 subcomment

i use luau a lot as part as my Roblox development work, it's pretty fast for its main use case.
there are people a lot more knowledgeable about this topic so i won't pretend to know this is possible, but could a versioning flag similar to the !native flag be added? it would allow both for backwards compatibility and better optimizations, although i know it might add complexity where it's not needed

by ramanvarma

0 subcomment

i'm impressed how much the runtime is optimized across so many layers - pretty rare to see an interpreted language push this far without a JIT. Do you see this approach eventually rivaling JIT performance for real world workloads, esp where predictability matters?