From: Jake McArthur <jake.mcarthur@...>
Date: 2006-05-12T01:00:49+09:00
Subject: Re: Slowing threads

Insert the following code somewhere in your main thread:

class Thread
   attr_accessor :execution_speed
end

def set_execution_speed(seconds_per_line)
   Thread.current.execution_speed = seconds_per_line
   set_trace_func proc { |event, file, line, id, binding, classname|
     if event == "line" and !Thread.current.execution_speed.nil?
       sleep Thread.current.execution_speed
     end
   }
end

Then, at the beginning of any thread you want slowed down, call the  
set_execution_speed method. This will limit the rate that each line  
of code in the thread is executed. You can also modify the method so  
that it limits based on other criteria such as method calls.

- Jake McArthur