Re: Lua Performance, IO / Regexp, Dupe to "wide finder?"

[PA <petite.abeille@...>]

On Oct 18, 2007, at 21:42, Mariano Kamp wrote:

> But anyway, there has been no solution yet, right?

Well... depends how badly you want to mangle your code :P

Using find() before match() speed up things quite a bit and put them on 
par with the ruby version:

for aLine in io.lines() do
    if aLine:find( 'GET /ongoing/When/200x/' ) then
        local aPage = aLine:match( 'GET /ongoing/When/200x/([^%.]+) ' )

        if aPage then
            aMap[ aPage ] = ( aMap[ aPage ] or 0 ) + 1
        end
    end
end

gmatch: 0.41 real 0.30 user 0.05 sys
find:   0.20 real 0.16 user 0.01 sys
ruby:   0.20 real 0.16 user 0.01 sys

LuaProfiler:

io.lines 31 %
find     26 %
sort     13 %
match    10 %

> Is there something like Ruby's ARGF.each_line? In Ruby you would get 
> all the lines of all the files specified on the command line, not just 
> the lines you'd get from STDIN.

Hmmm... not out of the box as far as I know... io.stdin by default... 
in Lua, you usually have to bring your own batteries :P