From: ara.t.howard@...
Date: 2007-02-02T03:25:47+09:00
Subject: Re: For performance, use Lua

On Fri, 2 Feb 2007, William James wrote:

> And this is slower than pure interpreted Lua (on a 3.19GHz machine).  Try
> it.

it isn't on my machine - but perhaps i'm doing something wrong?  can you show
it?


   harp:~ > cat a.lua
   function average( list )
     local sum = 0
     for i = 1, #list do
       sum = sum + list[i]
     end
     return sum / #list
   end

   local max_loop = 20
   local max_size = 1e6

   time = os.clock()

   local a = {}
   for i = 1, max_size do  a[i] = i  end

   local total = 0
   for i = 1, max_loop do
     total = total + average( a )
   end
   print( os.clock() - time )
   print( total )
   print( total/max_loop )


   harp:~ > lua a.lua
   2.44
   10000010
   500000.5


   harp:~ > luac a.lua && lua luac.out
   2.47
   10000010
   500000.5



   harp:~ > cat a.rb
   require 'narray'

   time = Time.now

   max_loop = (ARGV.shift || 20).to_i
   max_size = (ARGV.shift || 1_000_000).to_i
   a = NArray.float(max_size).indgen + 1

   total = 0
   max_loop.times { total += a.mean }
   p Time.now - time
   p total, total/max_loop


   harp:~ > ruby a.rb
   0.287334
   10000010.0
   500000.5


regards.

-a
-- 
we can deny everything, except that we have the possibility of being better.
simply reflect on that.
- the dalai lama