![Multithreading ticker
t1 = Thread.new do
puts "[Thread 1] Started"
sleep 2
puts "[Thread 1] Completed"
end
!
t2 = Thread.new do
5.times do |n|
puts "[Thread 2] tick #{n}"
end
end](https://image.slidesharecdn.com/parallelcomputingupdated-140401195405-phpapp01/85/Multithread-Your-Application-13-320.jpg)
![Multithreading ticker
t1 = Thread.new do
puts "[Thread 1] Started"
sleep 2
puts "[Thread 1] Completed"
end
!
t2 = Thread.new do
5.times do |n|
puts "[Thread 2] tick #{n}"
end
end
$ ruby thread_ticker.rb
[Thread 1] Started
[Thread 2] tick 0
[Thread 2] tick 1
[Thread 2] tick 2
[Thread 2] tick 3
[Thread 2] tick 4](https://image.slidesharecdn.com/parallelcomputingupdated-140401195405-phpapp01/85/Multithread-Your-Application-14-320.jpg)
![Multithreading ticker
t1 = Thread.new do
puts "[Thread 1] Started"
sleep 2
puts "[Thread 1] Completed"
end
!
t2 = Thread.new do
5.times do |n|
puts "[Thread 2] tick #{n}"
end
end
Where’s Completed ?
$ ruby thread_ticker.rb
[Thread 1] Started
[Thread 2] tick 0
[Thread 2] tick 1
[Thread 2] tick 2
[Thread 2] tick 3
[Thread 2] tick 4](https://image.slidesharecdn.com/parallelcomputingupdated-140401195405-phpapp01/85/Multithread-Your-Application-15-320.jpg)
![Multithreading ticker
t1 = Thread.new do
puts "[Thread 1] Started"
sleep 2
puts "[Thread 1] Completed"
end
!
t2 = Thread.new do
5.times do |n|
puts "[Thread 2] tick #{n}"
end
end
!
t1.join
t2.join](https://image.slidesharecdn.com/parallelcomputingupdated-140401195405-phpapp01/85/Multithread-Your-Application-16-320.jpg)
![Multithreading ticker
t1 = Thread.new do
puts "[Thread 1] Started"
sleep 2
puts "[Thread 1] Completed"
end
!
t2 = Thread.new do
5.times do |n|
puts "[Thread 2] tick #{n}"
end
end
!
t1.join
t2.join
$ ruby thread_ticker.rb
[Thread 1] Started
[Thread 2] tick 0
[Thread 2] tick 1
[Thread 2] tick 2
[Thread 2] tick 3
[Thread 2] tick 4
[Thread 1] Completed](https://image.slidesharecdn.com/parallelcomputingupdated-140401195405-phpapp01/85/Multithread-Your-Application-17-320.jpg)
![Fiber Ticker
require 'fiber'
!
fb1 = Fiber.new do
puts "[Fiber 1] Started"
sleep 2
puts "[Fiber 1] Completed"
end
!
fb2 = Fiber.new do
5.times do |n|
puts "[Fiber 2] tick #{n}"
end
end
!
fb1.resume
fb2.resume](https://image.slidesharecdn.com/parallelcomputingupdated-140401195405-phpapp01/85/Multithread-Your-Application-26-320.jpg)
![Fiber Ticker
require 'fiber'
!
fb1 = Fiber.new do
puts "[Fiber 1] Started"
sleep 2
puts "[Fiber 1] Completed"
end
!
fb2 = Fiber.new do
5.times do |n|
puts "[Fiber 2] tick #{n}"
end
end
!
fb1.resume
fb2.resume
$ ruby fiber_tick.rb
[Fiber 1] Started
[Fiber 1] Completed
[Fiber 2] tick 0
[Fiber 2] tick 1
[Fiber 2] tick 2
[Fiber 2] tick 3
[Fiber 2] tick 4
http://schmurfy.github.io/2011/09/25/on_fibers_and_threads.html](https://image.slidesharecdn.com/parallelcomputingupdated-140401195405-phpapp01/85/Multithread-Your-Application-27-320.jpg)
![Evented Ticker
require 'fiber'
require 'eventmachine'
!
EM::run do
fb1 = Fiber.new do
puts "[Fiber 1] Started"
EM::add_timer(2){ fb1.resume }
Fiber.yield
puts "[Fiber 1] Completed"
EM::stop()
end
!
fb2 = Fiber.new do
5.times {|n| puts "[Fiber 2] tick #{n}" }
end
!
fb1.resume
fb2.resume
end
$ ruby evented_ticker.rb
[Fiber 1] Started
[Fiber 2] tick 0
[Fiber 2] tick 1
[Fiber 2] tick 2
[Fiber 2] tick 3
[Fiber 2] tick 4
[Fiber 1] Completed](https://image.slidesharecdn.com/parallelcomputingupdated-140401195405-phpapp01/85/Multithread-Your-Application-29-320.jpg)
Multithread Your Application
- 2. My Company
- 3. My Company
- 4. Challenges
- 6. • Learning Ruby • Rails 2 to Rails 3 Challenges
- 7. • Learning Ruby • Rails 2 to Rails 3 • Integrating with Banking APIs Challenges
- 10. Share Memory Space! Lightweight! May Have Memory Management Issues! Can Sometimes Take Advantage of Multiple CPUs Thread Process Separate Memory Space! Requires More Memory! No Multithreading Issues! Can Take Advantage of Multiple CPUs
- 11. CPU Scheduling High IO High CPU http://www.cs.rutgers.edu/~pxk/416/notes/07-scheduling.html
- 12. High I/O High IO Fill these I/O blocks with other CPU tasks!
- 13. Multithreading ticker t1 = Thread.new do puts "[Thread 1] Started" sleep 2 puts "[Thread 1] Completed" end ! t2 = Thread.new do 5.times do |n| puts "[Thread 2] tick #{n}" end end
- 14. Multithreading ticker t1 = Thread.new do puts "[Thread 1] Started" sleep 2 puts "[Thread 1] Completed" end ! t2 = Thread.new do 5.times do |n| puts "[Thread 2] tick #{n}" end end $ ruby thread_ticker.rb [Thread 1] Started [Thread 2] tick 0 [Thread 2] tick 1 [Thread 2] tick 2 [Thread 2] tick 3 [Thread 2] tick 4
- 15. Multithreading ticker t1 = Thread.new do puts "[Thread 1] Started" sleep 2 puts "[Thread 1] Completed" end ! t2 = Thread.new do 5.times do |n| puts "[Thread 2] tick #{n}" end end Where’s Completed ? $ ruby thread_ticker.rb [Thread 1] Started [Thread 2] tick 0 [Thread 2] tick 1 [Thread 2] tick 2 [Thread 2] tick 3 [Thread 2] tick 4
- 16. Multithreading ticker t1 = Thread.new do puts "[Thread 1] Started" sleep 2 puts "[Thread 1] Completed" end ! t2 = Thread.new do 5.times do |n| puts "[Thread 2] tick #{n}" end end ! t1.join t2.join
- 17. Multithreading ticker t1 = Thread.new do puts "[Thread 1] Started" sleep 2 puts "[Thread 1] Completed" end ! t2 = Thread.new do 5.times do |n| puts "[Thread 2] tick #{n}" end end ! t1.join t2.join $ ruby thread_ticker.rb [Thread 1] Started [Thread 2] tick 0 [Thread 2] tick 1 [Thread 2] tick 2 [Thread 2] tick 3 [Thread 2] tick 4 [Thread 1] Completed
- 18. Issues with Threads No control when Threads are preempted! Deadlock! Race conditions! Hard to debug
- 19. Race Condition
- 20. Race Condition
- 21. Race Condition
- 22. Fibers
- 23. Fibers Programmers specify when to give up control! Prevents concurrency issues! Lightweight
- 24. Fibers vs Threads http://oldmoe.blogspot.com/2008/08/ruby-fibers-vs-ruby-threads.html
- 25. Fibonacci fib = Fiber.new do f1 = f2 = 1 loop do Fiber.yield f1 f1, f2 = f2, f1 + f2 end end ! 5.times { p fib.resume } $ ruby fiber_fib.rb 1 1 2 3 5
- 26. Fiber Ticker require 'fiber' ! fb1 = Fiber.new do puts "[Fiber 1] Started" sleep 2 puts "[Fiber 1] Completed" end ! fb2 = Fiber.new do 5.times do |n| puts "[Fiber 2] tick #{n}" end end ! fb1.resume fb2.resume
- 27. Fiber Ticker require 'fiber' ! fb1 = Fiber.new do puts "[Fiber 1] Started" sleep 2 puts "[Fiber 1] Completed" end ! fb2 = Fiber.new do 5.times do |n| puts "[Fiber 2] tick #{n}" end end ! fb1.resume fb2.resume $ ruby fiber_tick.rb [Fiber 1] Started [Fiber 1] Completed [Fiber 2] tick 0 [Fiber 2] tick 1 [Fiber 2] tick 2 [Fiber 2] tick 3 [Fiber 2] tick 4 http://schmurfy.github.io/2011/09/25/on_fibers_and_threads.html
- 29. Evented Ticker require 'fiber' require 'eventmachine' ! EM::run do fb1 = Fiber.new do puts "[Fiber 1] Started" EM::add_timer(2){ fb1.resume } Fiber.yield puts "[Fiber 1] Completed" EM::stop() end ! fb2 = Fiber.new do 5.times {|n| puts "[Fiber 2] tick #{n}" } end ! fb1.resume fb2.resume end $ ruby evented_ticker.rb [Fiber 1] Started [Fiber 2] tick 0 [Fiber 2] tick 1 [Fiber 2] tick 2 [Fiber 2] tick 3 [Fiber 2] tick 4 [Fiber 1] Completed
- 30. When does Multithreading help? High I/O time such as File I/O DB call API request
- 32. Fibers Programmers specify when to give up control! Prevents concurrency issues! Lightweight
- 33. Multiprocessing? http://www.igvita.com/2008/11/13/concurrency-is-a-myth-in-ruby/
- 36. Rails Deploy
- 38. Parallel Gem
- 41. inDinero Enterprise 150,000 Transactions x 15,000 Rules
- 43. Recap Multithreading Thread Class Fibers Event Machine Multiprocessing Process Class Unicorn Magic Hadoop
- 44. Q & A