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Beam me up, Scotty

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Elixir and Erlang share the same VM called BEAM. In this very practical demo we discover some secrets of BEAM, and OTP.

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Beam me up, Scotty

  1. 1. BEAM me up, Scotty Prepare ship...prepare ship...for LUDICROUS SPEED!!!!
  2. 2. GPad Born to be a developer with an interest in “system admin” I develop using many languages like C++, C#, js and ruby. I have recently fallen in love with functional programming, especially with elixir, erlang, clojure and haskell. CTO & founder of coders51
  3. 3. We develop web and mobile solutions for the entire galaxy We don’t develop web sites At least not simple ones ... Every time there is something new and interesting, we want to be there!!
  4. 4. BEAM
  5. 5. History From http://www.erlang.org/course/history ● 1982 -1985 - First experiment with 20 different languages. ● 1985 - 1986 - Experiments with Lisp,Prolog, Parlog etc. Conclusion: The language must contain primitives for concurrency and error recovery. ● 1987 - First experiment with Erlang.
  6. 6. History From http://www.erlang.org/course/history ● ... ● 1990 - Erlang is presented at ISS'90, which results in several new users. ● 1992 - Erlang is ported to VxWorks, PC, Macintosh etc. Three applications using Erlang are presented at ISS'92. ● 1993 - Distribution is added to Erlang, which makes it possible to run a homogeneous Erlang system on a heterogeneous hardware.
  7. 7. History
  8. 8. History
  9. 9. History
  10. 10. History
  11. 11. History
  12. 12. History
  13. 13. History From https://en.wikipedia.org/wiki/Java_version_history#JDK_Alpha_and_Beta The first alpha and beta Java public releases in 1995 had highly unstable APIs and ABIs. The supplied Java web browser was named WebRunner. From https://en.wikipedia.org/wiki/Java_version_history#JDK_1.0 The first version was released on January 23, 1996 and called Oak.[3][4] The first stable version, JDK 1.0.2, is called Java 1.
  14. 14. History From https://en.wikipedia.org/wiki/.NET_Framework_version_history#.NET_Framework_1.0 The first version of the .NET Framework was released on 13 February 2002 for Windows 98, ME, NT 4.0, 2000, and XP.
  15. 15. Why BEAM From http://www.erlang.org/ Erlang is a programming language used to build massively scalable soft real-time systems with requirements on high availability. Some of its uses are in telecoms, banking, e-commerce, computer telephony and instant messaging. Erlang's runtime system has built-in support for concurrency, distribution and fault tolerance.
  16. 16. Why BEAM From http://stackoverflow.com/questions/16779162/what-kind-of-virtual-machine-is-beam-the-erlang-vm The Erlang VM runs as one OS process. By default it runs one OS thread per core to achieve maximum utilisation of the machine. The number of threads and on which cores they run can be set when the VM is started.
  17. 17. Why BEAM From http://stackoverflow.com/questions/16779162/what-kind-of-virtual-machine-is-beam-the-erlang-vm Erlang processes are implemented entirely by the Erlang VM and have no connection to either OS processes or OS threads. So even if you are running an Erlang system of over one million processes it is still only one OS processes and one thread per core. So in this sense the Erlang VM is a "process virtual machine" while the Erlang system itself very much behaves like an OS and Erlang process have very similar properties to OS processes, for example isolation. There is actually an Erlang VM, based on the BEAM, which runs on the bare metal and is in fact an OS in its own right, see Erlang on Xen.
  18. 18. Why BEAM From http://stackoverflow.com/questions/16779162/what-kind-of-virtual-machine-is-beam-the-erlang-vm Btw it is perfectly possible to have systems running millions of Erlang processes and it is actually done in some products, for example WhatsApp. We were definitely thinking very much about OSes when we designed the basic Erlang environment. Robert Virding
  19. 19. DEMO https://github.com/gpad/beam-me-up-scotty/blob/master/beam.md
  20. 20. Why BEAM ● A lot of process ● Message passing ● Link e monitored process ● GC distributed on every process ● Built with distributed in mind ● Not only ...
  21. 21. OTP
  22. 22. OTP From http://www.erlang.org/ OTP is set of Erlang libraries and design principles providing middle-ware to develop these systems. It includes its own distributed database, applications to interface towards other languages, debugging and release handling tools.
  23. 23. DEMO https://github.com/gpad/beam-me-up-scotty/blob/master/otp.md https://github.com/gpad/beam-me-up-scotty/blob/master/distributed.md
  24. 24. Why OTP ● GenServer ● Supervisor ● A lot of other patterns ... ● Always think in async and distributed way (timeout) ● The community think about to increase (CRDT, Kademlia, GenStage, etc…)
  25. 25. Thank you!!