Re: Performance question

["Jason P" <ahq_ranger@...>]

> From: Ando Sonenblick <ando@spritec.com>
> Reply-To: Lua list <lua@bazar2.conectiva.com.br>
> To: Lua list <lua@bazar2.conectiva.com.br>
> Subject: Re: Performance question
> Date: Sun, 28 Sep 2003 17:48:39 -0700
>
> True enough....
>
> But, perhaps I'm misunderstanding something (not yet having looked into 
> refs - hey, it's the weekend) but this is my understanding of them based on 
> these email exchanges.
>
> Say I have a global variable named "foo".
>
> If I'm accessing it a lot (from C++ that is) by name, doesn't every access 
> go thru a string compare look up in the global table?   And isnt it the 
> case that if I make a reference to that variable and use that for my 
> access, there will no longer be a string compare?
>
> Is there still a ref look up?  Or is it a direct value (such as a ptr or 
> index, etc)?

I would take a guess and say that from the fact that the luaregistry is a 
table,
and refs are numbers, that to get a ref you need simply access the ref index 
of
that that table. This is just my conjecture. If so, then it should be quite 
a bit
faster than pushing the string over and over to access the variable.

Maybe its time to write a little performance test application...

_________________________________________________________________
Instant message in style with MSN Messenger 6.0. Download it now FREE!  
http://msnmessenger-download.com