Concurrent Ruby

A short overview of concurrency and parallelism, the perils of the shared memory model, safer alternatives, the Guilds proposal for Ruby 3, and a short look at the concurrent-ruby gem.

Transcript

1. Concurrent Ruby Concurrent Ruby @mfilej Slovenia Ruby User Group September 2016
2. Concurrency Parallelism Concurrency Parallelism
4. Running Paused Thread A Thread B CPU core TIME SLICING
5. CPU CPU CPU CPU CPU CP CP CP CP CPU CPU PU CPU CPU CPU CPU PU PU PU CPU CPU CPU CPU CPU
6. ✂
7. SHARED DATA
9. MUTEX (mutual exclusion)
11. GIL/GVL
12. Don't communicate by sharing memory. Share memory by communicating. q
13. GUILDS (proposal for Ruby 3) Koichi Sasada http://www.atdot.net/~ko1/activities/2016_rubykaigi.pdf
14. GUILD THREAD (≥1) OBJECTS GUILD THREAD (≥1) OBJECTS
15. ✴ Mutable objects belong to ONLY ONE Guild ✴ OTHER Guilds cannot access those objects ✴ No need for LOCKS ✴ Guilds communicate via CHANNELS (copying or moving). ✴ IMMUTABLE objects can be accessed by any Guild
16. irb> [1, 2, 3].freeze irb> [1, Object.new, 3].freeze irb> 1, :sup, true, false, nil irb> "sup" # ruby 2.3 irb> "sup".freeze # ruby 2.3 irb> "sup" # ruby 3 irb> String("sup") # ruby 3 IMMUTABLE MUTABLE IMMUTABLE IMMUTABLE MUTABLE IMMUTABLE MUTABLE
17. GUILDS (Ruby 3, 2020?) Koichi Sasada http://www.atdot.net/~ko1/activities/2016_rubykaigi.pdf
23. Thank you for listening. g