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- Subject: Re: The Lua interpreter and large scripts
- From: Sean Conner <sean@...>
- Date: Wed, 11 Nov 2009 06:22:59 -0500
It was thus said that the Great Mike Pall once stated:
> Sean Conner wrote:
> > Third example was running the Lua interpreter with the "-i" option loading
> > up show.lua, then typing
> > dofile("default.lua")
> > It was the third example that took six minutes.
> The "-i" option loads readline which as a side-effect initializes
> the NLS locale for the current process from the environment
> This may slow down all conversions of strings to numbers, numbers
> to strings and string comparisons. Looks like it's 30x slower in
> your case.
> Try os.setlocale("C") before the dofile().
I did that. Still took six minutes. I even set the locale from the
command line and tried, and it took six minutes.
I then did a quick look at the Lua interpeter (lua.c). The Lua function
int n = lua_gettop(L);
return lua_gettop(L) - n;
whereas the "-i" option appears to do:
int base = lua_gettop(L) - narg
lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
I'm still not sure why loading a small file via the "-i" option before
loading the 80M script via dofile() takes so darned long.