From: Charles Oliver Nutter <charles.nutter@...>
Date: 2008-07-02T06:04:59+09:00
Subject: Re: [ANN] threadify-0.0.1

ara howard wrote:
> 
> 
> this one's for you charlie ;-)

Appears to work just dandy under JRuby:

➔ time jruby --server -rthreadify -e "nums = *(1..35); def fib(n); if n 
< 2; return n; else; return fib(n - 1) + fib(n - 2); end; end; nums.each 
{|i| p fib(i)}"
  ...
real	0m11.889s
user	0m11.733s
sys	0m0.188s
~/NetBeansProjects/jruby ➔ time jruby --server -rthreadify -e "nums = 
*(1..35); def fib(n); if n < 2; return n; else; return fib(n - 1) + 
fib(n - 2); end; end; nums.threadify {|i| p fib(i)}"
  ...
real	0m8.213s
user	0m12.722s
sys	0m0.178s

(One thread on my system consumes roughly 65-70% CPU, which explains why 
full CPU on both cores doesn't double performance here)

I also found some weird bug where Thread#kill/exit from within the 
thread interacts weirdly with join happening outside, and never 
terminates. Fixing that now.

- Cahrlie