From: Alex Stahl <astahl@...5.com>
Date: 2010-09-28T11:35:45+09:00
Subject: Re: Point me to help w/ multithreading in 1.9.2-p0

Nevermind... figured it out.

Though I still wonder if there's any highly-detailed technical
documentation on ruby threading? (Or is the interpreter source
considered it?)

-Alex

On Mon, 2010-09-27 at 20:36 -0500, Alex Stahl wrote:
> Hi Folks - A week or two ago, I pinged this list for recommendations on
> a load testing gem.  Unfortunately, didn't see much response from that
> that pointed me in the right direction.  So I've set about to write my
> own, using threads, and can't find proper resources to help me
> understand what's going on w/ said threads.
> 
> Here's the two key methods I'm using and figure are the source of my
> troubles.  First question is whether there's any glaring errors here
> that I'm missing:
> 
> class ThreadedLoadTester
> 
>   def initialize(users, apis, session=nil)
> 
>     @threads = []
>     @count = users
>     @session = session
>     1.upto @count.to_i do
> 
>       @threads << Thread.new do
>         Thread.current[:hi5] = Hi5fbapi.new 'redacted params'
>         Thread.current["api_calls"] = []
> 
>         apis.each do |api|
> 	  #get_call returns a proc object w/ a snippet of test code
>           Thread.current["api_calls"] << get_call(api)
>         end
> 
>         Thread.stop
>       end
>     end
>   end
> 
>   def run_threads()
> 
>     @threads.each do |thr|
>       thr[:api_calls].each do |api|
>         p api.call thr[:hi5], @session
>       end
>     end
> 
>     @threads.each {|t| t.wakeup.join}
>     return nil
>   end
> 
> Basically, I spin up a bunch of threads when I initialize the object,
> populate an array in each thread w/ a series of proc objects, and then
> put them to sleep.  Then, when I run_threads(), the idea is to iterate
> over each thread, iterate over the thread's array of procs, and call
> each one.  Oh, and this object is consumed by a sinatra-based web app.
> 
> This works sometimes.  And sometimes it segfaults in a nasty way.  I'm
> having a hard time finding the technical details of how threading in
> Ruby, particularly 1.9.2-p0, works.  Any pointers?
> 
> Thanks,
> Alex
> 
>