parallel ruby

gistfile1.txt

$ cat parallel.rb
# parallel

work=["A","B"]

# Launch threads
work.map! do |job|
 Thread.new do
   puts "I got #{job}"
   20000000.times { 4.0/2.0 }
 end
end

# Wait for each thread to finish
work.each { |thread| thread.join }

$ time /usr/local/ruby-enterprise-1.8.7-2010.01/bin/ruby parallel.rb
I got A
I got B

real	0m9.226s
top says RSS 2340k, 1 core

$ time /usr/local/ruby/1.9.2-p136/bin/ruby parallel.rb
I got BI got A


real	0m7.580s
top says RSS 2648k, 1 core

$ time /usr/local/ruby/rbx-1.2.3/bin/ruby parallel.rb
I got A
I got B

real	0m5.463s
top says 26,000k 1 core

$ time /usr/local/java/jruby-1.6.0/bin/jruby parallel.rb 
I got A
I got B

real	0m7.130s
top says 29,000k *2 cores*

$ cat parallel.go
package main
import "fmt"

func main() {
  ch := make(chan string)
  work := []string{"A","B"}

  for i := 0; i < len(work); i++ {
    go func(job string) {
      fmt.Printf("I got %s\n", job)
      for i := 0; i < 20000000; i++ {
        _ = 4.0 / 2.0
      }
      ch <- job
    }(work[i])
  }

  <- ch
  <- ch
}

$ 8c parallel.go
$ time ./8.out
I got A
I got B

real	0m0.054s
top says RSS 980k 1 core