From: brabuhr@...
Date: 2009-08-20T02:26:46+09:00
Subject: Re: Confirm my Performance Test Against Java?

On Wed, Aug 19, 2009 at 11:07 AM, Reid Thompson<reid.thompson@ateb.com> wrote:
> brabuhr@gmail.com wrote:
>>
>> On Wed, Aug 19, 2009 at 9:31 AM, Ben Christensen
>> <benjchristensen@gmail.com> wrote:
>>>
>>> I'm evaluating Ruby for use in a variety of systems that are planned by
>>> default to be Java.
>>>
>>> I've started down a path of doing various performance tests to see what
>>> kind of impact will occur by using Ruby and in my first test the numbers
>>> are very poor - so poor that I have to question if I'm doing something
>>> wrong.
>>
>> Is this test case in any way representative of the tasks you will
>> actually be performing?
>
> If it is, then you should just do
> $ time wc approach.txt
>  6836  78325 484114 approach.txt

:-)

I got a little crazy; first the numbers (slower hardware this time):

> uname -a
Linux eXist 2.6.28-14-generic #47-Ubuntu SMP Sat Jul 25 00:28:35 UTC
2009 i686 GNU/Linux

> java -version
java version "1.6.0_0"
OpenJDK Runtime Environment (IcedTea6 1.4.1) (6b14-1.4.1-0ubuntu11)
OpenJDK Client VM (build 14.0-b08, mixed mode, sharing)

> java FileReadParse
Starting to read file...
The number of tokens is: 479623
It took 596 ms

> /opt/matzruby/trunk/bin/ruby -v -rubygems file_read_parse.rb
ruby 1.9.2dev (2009-08-14 trunk 24539) [i686-linux]
Starting to read file ...
The number of tokens is: 479623
It took 1751.92544 ms

> /opt/matzruby/trunk/bin/ruby -v -rubygems file_read_parse-3.rb
ruby 1.9.2dev (2009-08-14 trunk 24539) [i686-linux]
ffi_c.so: warning: method redefined; discarding old inspect
struct.rb:26: warning: method redefined; discarding old offset
variadic.rb:15: warning: method redefined; discarding old call
library.rb:78: warning: method redefined; discarding old fopen
library.rb:78: warning: method redefined; discarding old fgetc
Starting to read file ...
It took 4565.077896 ms
The number of tokens is: 479623

> jruby -v -rubygems file_read_parse.rb
jruby 1.3.0 (ruby 1.8.6p287) (2009-06-03 5dc2e22) (OpenJDK Client VM
1.6.0_0) [i386-java]
Starting to read file ...
The number of tokens is: 479623
It took 2316.0 ms

> jruby -v -rubygems file_read_parse-3.rb
jruby 1.3.0 (ruby 1.8.6p287) (2009-06-03 5dc2e22) (OpenJDK Client VM
1.6.0_0) [i386-java]
Starting to read file ...
It took 3117.0 ms
The number of tokens is: 479623

And the code:

> cat file_read_parse-3.rb
require 'ffi'

module LibC
  extend FFI::Library

  # FILE *fopen(const char *path, const char *mode);
  attach_function :fopen, [ :string, :string ], :pointer

  # int fgetc(FILE *stream);
  attach_function :fgetc, [ :pointer ], :int
end

puts "Starting to read file ..."
start = Time.now

file = LibC.fopen("/tmp/file_test.txt", "r")
count = 0; in_word = false
while (c = LibC.fgetc(file)) != -1
  if 32 < c and c < 127
    unless in_word
      count += 1
      in_word = true
    end
  else
    in_word = false
  end
end

stop = Time.now
puts "It took #{(stop - start) * 1000} ms"
puts "The number of tokens is: #{count}"