From: Jason Mayer <slamboy@...>
Date: 2006-11-26T00:00:51+09:00
Subject: Re: newbie question regarding threads and system commands

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As it turns out, your program runs fine (<4 seconds) if I change the ping
destinations to something on the internal network.  Looks like a router is
misconfigured somewhere.  Thanks!

On 11/25/06, Jason Mayer <slamboy@gmail.com> wrote:
>
> Maybe there's something wrong with my system here at work then.... because
> this took 11.something seconds to run on my machine.  I'll test again from
> home (both xp pro systems)
>
> On 11/24/06, Edwin Fine <efine145-nospam01@usa.net> wrote:
> >
> > This is one possible solution, which seems to work fine (it takes 3.14
> > seconds on my system to ping 3 web sites). Bottom line: you need to keep
> > a list of the threads and join all of them in the calling code. Hope
> > this helps. I recommend that you get a copy of the "Pickaxe" book
> > (Programming Ruby: The Pragmatic Programmers Guide, 2nd edition) , which
> > has a very good section on threading and lots of examples. In the
> > meantime, you can read this from the first edition:
> >
> > http://www.rubycentral.com/book/tut_threads.html
> > -------------
> > require 'thread'
> >
> > class SystemExecutor
> > # Returns array [[cmd, response], [cmd, response], ...]
> > def SystemExecutor.run(system_cmd_list)
> >    thread_list = []
> >    system_response_list = []
> >    srl_mutex = Mutex.new
> >
> >    system_cmd_list.each do |cmd|
> >      thread_list << Thread.new do
> >        begin
> >          response = %x{ #{cmd} }
> >          srl_mutex.synchronize do
> >            system_response_list << [cmd, response]
> >          end
> >        rescue Exception => exc
> >          srl_mutex.synchronize do
> >            system_response_list << [cmd, exc]
> >          end
> >        end
> >      end
> >    end
> >
> >    thread_list.each { |thr| thr.join }
> >    system_response_list
> > end
> > end
> >
> > puts "Starting ping"
> > start_time = Time.now
> > resp = SystemExecutor.run(['ping www.ruby-forum.org', 'ping
> > www.sourceforge.net', 'ping www.google.com'])
> > elapsed_time = Time.now - start_time
> >
> > resp.each do |cmd, resp|
> > puts "Command: #{cmd}", '-' * 20
> > puts "Response:\n", '-' * 20, "#{resp}"
> > end
> >
> > puts "Elapsed time: #{elapsed_time} seconds."
> >
> > --
> > Posted via http://www.ruby-forum.com/.
> >
> >
>
>

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