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Grow Your Unix Beard With Ruby Jesse Storimer

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@jstorimer

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Grow Your Unix Beard With Ruby

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Unix Ruby

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http://tomayko.com/writings/unicorn-is-unix

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:o http://www.flickr.com/photos/69er/463302758/

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http://whiteboardunicorns.com

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Rack HTTP server for fast clients and Unix

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Rack HTTP server for fast clients and Unix

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Pre-forking

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forking

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fork() creates a new process

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fork() returns twice

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fork() returns twice

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fork() returns twice once, but in two processes

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fork() creates an exact copy of the calling process

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@hits = Array(1..5) pid = Process.fork do @hits.delete_at(1) puts "Child hits: #@hits" end Process.wait(pid) puts "Parent hits: #@hits"

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$hits = Array(1..5) pid = Process.fork do $hits.delete_at(1) puts "Child hits: #$hits" end Process.wait(pid) puts "Parent hits: #$hits"

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Pre-forking

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Pre-forking

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http://whiteboardunicorns.com

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def start open_listener_socket load_rack_app 2.times do fork { worker_loop } end end def worker_loop loop do connection = listener_socket.accept process_client(connection) end end

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copy on write: share memory until it’s modified

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CoW Friendly Rubies •MRI 2.0 •Ruby Enterprise Edition •MRI 1.9.3-p194-perf

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replace an instance of itself without losing any connections

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http://whiteboardunicorns.com

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def reexec fork do cmd = [$0] cmd << ARGV.dup ENV['LISTENERS'] = sockets.map(&:fileno) exec(*cmd) # exec("unicorn", "-c", "unicorn_config.rb") end end

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exec() transforms the calling process into a new process

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def reexec fork do cmd = [$0] cmd << ARGV.dup ENV['LISTENERS'] = sockets.map(&:fileno) exec(*cmd) # exec("unicorn", "-c", "unicorn_config.rb") end end

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http://unicorn.bogomips.org/

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fork + exec

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fork + exec Process.spawn('time cat') system('time cat') `time cat` IO.popen('time cat') Open3.popen3('time cat')

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module Process def self.spawn(*args) # .. IO.pipe do |read, write| pid = Process.fork do read.close write.close_on_exec = true begin Rubinius::Spawn.exec(env, prog, argv, redirects, options) rescue => e write.write Marshal.dump(e) exit! 1 end end # .. end end end fork + exec

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module Process def self.spawn(*args) # .. IO.pipe do |read, write| pid = Process.fork do read.close write.close_on_exec = true begin Rubinius::Spawn.exec(env, prog, argv, redirects, options) rescue => e write.write Marshal.dump(e) exit! 1 end end # .. end end end fork + exec

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fork + exec $ curl google.com > google.html pid = fork do $stdout.reopen('google.html') exec('curl', 'google.com') end Process.wait(pid)

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fork + exec $ curl google.com > google.html pid = fork do $stdout.reopen('google.html') exec('curl', 'google.com') end Process.wait(pid)

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The original Unix beards

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“[..] the Unix beard is really an extension of the philosopher's beard, and the academic's beard.”

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Thanks! Tweet @jstorimer Email jesse@jstorimer.com Books http://workingwithcode.com Use RUBYCONF to save $10

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“Thirty years from now, there will still be a fork(2) and a pipe(2) and a exec(2) and smart people will still be using them to solve hard problems reliably and predictably, just like they were thirty years ago.” ~ Ryan Tomayko

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Refs •http://www.colourlovers.com/palette/1938182/coconut_lips_RC •http://www.colourlovers.com/palette/1111659/Ninja_Rainbow •http://www.colourlovers.com/palette/1936237/Keynote_2 •http://whiteboardunicorns.com/ •http://www.flickr.com/photos/amyvdh/6003141750/sizes/o/in/photostream/ •http://www.twoideas.org/2009/07/unix-beards/ •http://www.flickr.com/photos/69er/463302758/