[RubyConf.tw 2014] Cores unleashed - Exploiting Parallelism in Ruby with STM

Speaker notes: http://blog.brucehsu.org/posts/2014/04/26/rubyconftw-2014-cores-unleashed-exploiting-parallelism-in-ruby-with-stm

Transcript

1. Cores Unleashed Exploiting Parallelism in Ruby with STM Szu-Kai Hsu @brucehsu
2. @brucehsu
4. There was a time...
5. There was a time... when programmers were happy (relatively)
14. “Global Interpreter Lock is a mechanism used in computer language interpreters to synchronize the execution of threads so that only one thread can execute at a time. An interpreter which uses GIL will always allow exactly one thread to execute at a time, even if run on a Multi-core processor. Some popular interpreters that have GIL are CPython and Ruby MRI.” http://en.wikipedia.org/wiki/ GlobalInterpreterLock
15. Alternative implementations Those using fine-grained locks » JRuby » Rubinius » MacRuby
19. Beautiful Concurrency, Simon Peyton Jones 2007 1.Taking too few locks 2.Taking too many locks 3.Taking the wrong locks 4.Taking locks in the wrong orders 5.Error recovery 6.Lost wake-ups and erroneous retries
20. Software Transactional Memory
21. Transaction Attributes - Atomicity - Consistency - Isolation - Durability
23. STM is a sound Abstraction of locks
24. How do we implement STM in Ruby?
25. Why not in Go?
26. Why not a new VM?
27. RunVM
28. Live Demo?
30. Why Go? And I say, why not? » Easier to write » Good performance » Growing community and resources » Goroutines and channels » Go is for Hipsters
32. RunVM Specification » Subset of tinyrb » Stack-based VM » Thanks to Ruby Under a Microscope
33. Transactional Locking II
36. Thanks!