Elixir and Erlang share the same VM called BEAM. In this very practical demo, we discover some secrets of BEAM and OTP. This a refreshed version of an old presentations.

1. BEAM me up, Scotty
Prepare ship...prepare ship...for LUDICROUS SPEED!!!!

2. GPad
Born to be a developer with an interest in distributed system.
I have developed with many languages like C++, C#, js and ruby. I had fallen in love
with functional programming, especially with Elixir and Erlang.
● Twitter: https://twitter.com/gpad619
● Github: https://github.com/gpad/
● Medium: https://medium.com/@gpad
CTO & founder of coders51

3. Coders51 Is Hiring!!!
Write to admin@coders51.com or gpad@coders51.com

4. BEAM

5. BEAM
From wikipedia:
BEAM is the virtual machine at the core of the Erlang Open Telecom Platform (OTP).
BEAM is part of the Erlang Run-Time System (ERTS), which compiles Erlang and
Elixir source code into bytecode, which is then executed on the BEAM. BEAM
bytecode files have the .beam file extension.

6. BEAM
From wikipedia:
Originally BEAM was short for Bogdan's Erlang Abstract Machine, named after
Bogumil "Bogdan" Hausman, who wrote the original version, but the name may also be
referred to as Björn's Erlang Abstract Machine, after Björn Gustavsson, who wrote and
maintains the current version. Both developers worked on the system while at Ericsson.
The predecessor of the BEAM was JAM (Joe's Abstract Machine), which was the first
virtual machine for the Erlang language and was written by Joe Armstrong.

7. 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.

8. 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.

15. 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.

16. 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.

17. History
From https://en.wikipedia.org/wiki/PHP
PHP is a general-purpose scripting language especially suited to web development. It was
originally created by Danish-Canadian programmer Rasmus Lerdorf in 1994.

18. 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.

19. 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.

20. 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.

21. 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

22. DEMO

23. GenServer/Supervisor
GenServer reacts to message it receives. Executes some
actions and return to itself the new state.
Supervisor monitors and is linked to its children and
when detect their death it restart (using different
policies).

24. OTP

25. 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.

26. Why OTP
● GenServer
● Supervisor
● A lot of other patterns ...
● Always think in async and distributed way (timeout)
● The community think about to increase (CRDT, GenStage, Broadway, etc…)

27. DEMO

28. Warning!!!!

29. Don’t try this at home

30. DEMO

31. What are the fields of application of Elixir?

32. Web Development

33. Machine Learning

34. Embed

35. Messaging

36. Who is using Elixir/Erlang?

37. Batteries Included
Erlang and all OTP (gen_server, logger, mnesia, distribution, etc …)
Tool to build and deploy your application (mix, eunit, etc …)
Some libraries supported by “core team” (ecto, phoenix, telemetry, etc …)

38. Where to start
https://elixir-lang.org/
https://beam-italia.slack.com/
http://www.italian-elixir.org/
https://www.meetup.com/it-IT/Elixir-Roma/

39. Thank you!!