From: Yukihiro Matsumoto <matz@...>
Date: 2007-02-22T11:51:50+09:00
Subject: Re: Making Ruby faster

Hi,

In message "Re: Making Ruby faster"
    on Thu, 22 Feb 2007 11:25:10 +0900, "William James" <w_a_x_man@yahoo.com> writes:

|3% is a modest improvment.  Let's see what can be
|achieved by switching to a language that's designed
|to be fast.
|
|            Ruby   Lua  LuaJIT
|------------------------------
|tarai         0%  408%   1918%
|fib           0%  497%   2874%
|mandelbrot    0%  920%   1347%

Here's my numbers, meaningful or not:

            Ruby  YARV
-----------------------
tarai         0%  547%
fib           0%  540%
mandelbrot    0%  172%
total         0%  472%
-----------------------

def tarai( x, y, z )
  if x <= y then
    return y
  else
    return tarai( tarai(x-1, y, z),
                  tarai(y-1, z, x),
                  tarai(z-1, x, y))
  end
end

p tarai(12, 6, 0)

#####

def fib( n )
  if n < 3 then
    return 1
  else
    return fib(n-1) + fib(n-2)
  end
end

p fib(12)

#####

include Math

def c_mul( c1, c2 )
  a,b = c1
  c,d = c2
  return a*c - b*d, a*d + c*b
end

def c_abs(c)
  a, b = c
  return sqrt( a*a + b*b )
end

def is_mandelbrot( z )
  for i in 1..100 do
    z = c_mul( z, z )
    if c_abs( z ) > 2 then
      return false
    end
  end
  return true
end

ary = []

for xx in 0..100 do
  for yy in  0..100 do
    c = [xx / 50.0, yy / 50.0]
    if is_mandelbrot( c ) then
      ary.push(c)
    end
  end
end