From: Frank Mitchell <frankm@...>
Date: 2003-09-22T12:48:41+09:00
Subject: Re: Performance: Ruby vs Java

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BTW, just for comparison I translated your program into Python and Lua. 
(See www.python.org and www.lua.org, respectively.)  Both languages
compile their scripts into bytecodes before running them.

On my pathetic 166 MHz laptop running Linux, calculating whether 400003
was prime took too long, so I knocked out a couple of zeroes.  These are
the timings I ended up with:

prime.lua:	0:57.96   # Lua 5.0
prime.py:	3:23.01   # Python 2.2.2
prime.rb:	4:50.35  # Ruby 1.8.0
Prime.java	0:08.01   # Kaffe 1.0.7, JIT enabled

So, even with Kaffe, the JIT makes one or two orders of magnitude
difference.  (The Lua number shows what a small and ultra-optimized
interpreter could do.)

Attached are the Python and Lua translations.

-- 
Frank Mitchell (frankm each bayarea period net)

Please avoid sending me Word or PowerPoint attachments.
See http://www.fsf.org/philosophy/no-word-attachments.html
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 name="prime.py"
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#!/usr/bin/env python

def is_prime(n):
    for i in range(1, n):
        for j in range(1, n):
            if i * j == n:
                return 0
    return 1

print is_prime(2)
print is_prime(4)
print is_prime(7)
print is_prime(25)
print is_prime(4003)
# print is_prime(400003)

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#!/usr/bin/env lua

function is_prime(n)
   for i = 1, (n-1) do
      for j = 1, (n-1) do
         if (i * j) == n then
            return nil
         end
      end
   end
   return 1
end

print(is_prime(2))
print(is_prime(4))
print(is_prime(7))
print(is_prime(25))
print(is_prime(4003))
-- print(is_prime(400003))

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