Re: LuaJIT performance

[David Given <dg@...>]

John C. Turnbull wrote:
[...]
> Does anyone know a performance comparison of JIT’ed Lua versus something 
> like V8 JavaScript?  Lua has the reputation as the fastest scripting 
> language (in fact that’s how I came across it) but does the JIT compiler 
> used in modern JavaScript implementations like V8 greatly narrow the 
> performance gap?  JavaScript is clearly a much more comprehensive and 
> complex language so I would be surprised if it could be executed faster 
> than Lua but it’s the speed that we really need over language features.

I did some quick-and-dirty benchmarks as part of Clue. Back then, V8 
wasn't really set up for running command-line Javascript applications so 
I was never able to integrate it into the benchmark suite (I should 
check again), and the benchmarks are astonishingly artificial, but I saw 
that while V8 was way faster than any other Javascript interpreter out 
there, LuaJIT was still a lot better.

However, I wasn't quite testing like-for-like, so I'm not sure that this 
was a meaningful result. I need to go and have another look to see if V8 
has a proper command-line driver these days.

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