4Developers 2015: Lessons for Erlang VM - Michał Ślaski
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The document discusses the evolution of Erlang, including its background, key features, and properties such as robustness, distribution, and hot code loading. It also mentions significant projects in the Erlang ecosystem like RabbitMQ, MongooseIM, and Riak. Additionally, it highlights the Erlang community and upcoming events.
![Erlang
OTP
releases
$ ls -l ../abacus.tar
-rw-r--r-- 1 ms staff 12331520 Oct 31 12:01 abacus.tar
!
$ ls -1
bin
erts-6.1
lib
releases
!
$ ./bin/abacus
Erlang/OTP 17 [erts-6.1] [smp:4:4]
[async-threads:10] [kernel-poll:false]
!
Eshell V6.1 (abort with ^G)
(abacus@127.0.0.1)1>
github.com/michalslaski/erlang-‐workshop](https://image.slidesharecdn.com/michalaski-lessonsforerlangvm-150709121403-lva1-app6891/85/4Developers-2015-Lessons-for-Erlang-VM-Michal-Slaski-14-320.jpg)
![Erlang
properties
-‐
distribution
cat
flea
nodes() =
[cat@home, flea@home]](https://image.slidesharecdn.com/michalaski-lessonsforerlangvm-150709121403-lva1-app6891/85/4Developers-2015-Lessons-for-Erlang-VM-Michal-Slaski-32-320.jpg)
![Erlang
properties
-‐
distribution
cat dog
flea bird
nodes() =
[cat@home, flea@home]](https://image.slidesharecdn.com/michalaski-lessonsforerlangvm-150709121403-lva1-app6891/85/4Developers-2015-Lessons-for-Erlang-VM-Michal-Slaski-33-320.jpg)
![Erlang
properties
-‐
distribution
cat dog
flea bird
nodes() =
[cat@home, flea@home]
nodes() =
[dog@home, bird@home]](https://image.slidesharecdn.com/michalaski-lessonsforerlangvm-150709121403-lva1-app6891/85/4Developers-2015-Lessons-for-Erlang-VM-Michal-Slaski-34-320.jpg)
![Erlang
properties
-‐
distribution
cat dog
flea bird
nodes() =
[cat@home, flea@home]
nodes() =
[dog@home, bird@home]](https://image.slidesharecdn.com/michalaski-lessonsforerlangvm-150709121403-lva1-app6891/85/4Developers-2015-Lessons-for-Erlang-VM-Michal-Slaski-35-320.jpg)
![Erlang
properties
-‐
distribution
cat dog
flea bird
nodes() =
[cat@home, flea@home, dog@work, bird@work]](https://image.slidesharecdn.com/michalaski-lessonsforerlangvm-150709121403-lva1-app6891/85/4Developers-2015-Lessons-for-Erlang-VM-Michal-Slaski-36-320.jpg)
![Erlang
tracing
calls
redbug
-‐
github.com/massemanet/eper
• tracing
tool
built
on
top
of
erlang:trace/3
1> redbug:start("lists:seq(X,Y) -> return").
{30,1}!
2> lists:seq(1,5).!
[1,2,3,4,5]!
!
% 12:32:17 <0.32.0>({erlang,apply,2})!
% lists:seq(1, 5)!
!
% 12:32:17 <0.32.0>({erlang,apply,2})!
% lists:seq/2 -> [1,2,3,4,5]](https://image.slidesharecdn.com/michalaski-lessonsforerlangvm-150709121403-lva1-app6891/85/4Developers-2015-Lessons-for-Erlang-VM-Michal-Slaski-49-320.jpg)
4Developers 2015: Lessons for Erlang VM - Michał Ślaski
- 1. Lessons From Erlang Michał Ślaski @michalslaski ! ! ! 4Developers, 20.04.2015
- 2. Erlang timeline and my background
- 3. Erlang timeline and my background Started out in the Ericsson software lab 1987 (!)
- 4. Erlang timeline and my background Started out in the Ericsson software lab 1987 (!) • I was six years old
- 5. Erlang timeline and my background Started out in the Ericsson software lab 1987 (!) • I was six years old Released as open source in 1998
- 6. Erlang timeline and my background Started out in the Ericsson software lab 1987 (!) • I was six years old Released as open source in 1998 • I started computer science at AGH 2 years later
- 7. Erlang timeline and my background Started out in the Ericsson software lab 1987 (!) • I was six years old Released as open source in 1998 • I started computer science at AGH 2 years later Gains SMP support in 2005
- 8. Erlang timeline and my background Started out in the Ericsson software lab 1987 (!) • I was six years old Released as open source in 1998 • I started computer science at AGH 2 years later Gains SMP support in 2005 • I just graduated and joined Erlang Solutions
- 10. Maintenance vs. Development Maintenance may span for 20 years, whereas development may be 1-‐2 years. ! ! ! ! ! ! ! ! ! Schach, R., Software Engineering Fourth Edition, McGraw-‐Hill, Boston, MA 1999
- 12. Erlang properties OTP behaviours • set of design patterns • client-‐server, fsm, supervisor • application, release
- 13. Erlang properties OTP behaviours • set of design patterns • client-‐server, fsm, supervisor • application, release What for? • consistent maintenance procedures • one tar ball artefact
- 14. Erlang OTP releases $ ls -l ../abacus.tar -rw-r--r-- 1 ms staff 12331520 Oct 31 12:01 abacus.tar ! $ ls -1 bin erts-6.1 lib releases ! $ ./bin/abacus Erlang/OTP 17 [erts-6.1] [smp:4:4] [async-threads:10] [kernel-poll:false] ! Eshell V6.1 (abort with ^G) (abacus@127.0.0.1)1> github.com/michalslaski/erlang-‐workshop
- 16. Erlang properties Robustness • simple and consistent error recovery • supervision hierarchies • program for the correct case • let it crash
- 17. Erlang properties Robustness • simple and consistent error recovery • supervision hierarchies • program for the correct case • let it crash What for? • resilient to bugs and failures
- 18. Erlang properties -‐ supervision tree
- 19. Erlang properties -‐ supervision tree
- 20. Erlang properties -‐ supervision tree
- 21. Erlang properties -‐ supervision tree supervisor
- 22. Erlang properties -‐ supervision tree supervisor worker
- 23. Erlang properties -‐ supervision tree supervisor worker
- 24. Erlang properties -‐ supervision tree supervisor worker
- 25. Erlang properties -‐ supervision tree supervisor worker
- 27. Erlang properties Distribution • explicit or transparent distribution • network-‐aware runtime system
- 28. Erlang properties Distribution • explicit or transparent distribution • network-‐aware runtime system What for? • remote Erlang shell (REPL) • remote observing tools
- 29. Erlang properties -‐ distribution
- 30. Erlang properties -‐ distribution cat
- 31. Erlang properties -‐ distribution cat flea
- 32. Erlang properties -‐ distribution cat flea nodes() = [cat@home, flea@home]
- 33. Erlang properties -‐ distribution cat dog flea bird nodes() = [cat@home, flea@home]
- 34. Erlang properties -‐ distribution cat dog flea bird nodes() = [cat@home, flea@home] nodes() = [dog@home, bird@home]
- 35. Erlang properties -‐ distribution cat dog flea bird nodes() = [cat@home, flea@home] nodes() = [dog@home, bird@home]
- 36. Erlang properties -‐ distribution cat dog flea bird nodes() = [cat@home, flea@home, dog@work, bird@work]
- 37. entop vs. top
- 38. entop vs. top
- 41. Erlang properties Hot code loading • easily change code in a running system • enables non-‐stop operation • simplifies testing
- 42. Erlang properties Hot code loading • easily change code in a running system • enables non-‐stop operation • simplifies testing What for? • shorter development cycle • non-‐stop operations
- 44. Erlang properties Tracing in Erlang VM • Tracing is turned on/off per process • function calls, message passing, GC, scheduler
- 45. Erlang properties Tracing in Erlang VM • Tracing is turned on/off per process • function calls, message passing, GC, scheduler What for? • live debugging • no need to instrument code and recompile
- 46. Erlang tracing courtesy of Mats Cronqvist
- 48. Erlang tracing calls redbug -‐ github.com/massemanet/eper • tracing tool built on top of erlang:trace/3
- 49. Erlang tracing calls redbug -‐ github.com/massemanet/eper • tracing tool built on top of erlang:trace/3 1> redbug:start("lists:seq(X,Y) -> return"). {30,1}! 2> lists:seq(1,5).! [1,2,3,4,5]! ! % 12:32:17 <0.32.0>({erlang,apply,2})! % lists:seq(1, 5)! ! % 12:32:17 <0.32.0>({erlang,apply,2})! % lists:seq/2 -> [1,2,3,4,5]
- 50. Flame Graphs for Erlang -‐ eflame
- 51. Flame Graphs for Erlang -‐ eflame github.com/proger/eflame • as stacks are collected through tracing, blocking calls are noticed and are drawn in blue
- 52. Flame Graphs for Erlang -‐ eflame github.com/proger/eflame • as stacks are collected through tracing, blocking calls are noticed and are drawn in blue
- 53. What’s next?
- 54. Erlang the Movie
- 55. Erlang the Movie
- 56. Erlang the Movie II
- 57. Erlang the Movie II
- 59. Open source projects • RabbitMQ message broker
- 60. Open source projects • RabbitMQ message broker • MongooseIM XMPP server
- 61. Open source projects • RabbitMQ message broker • MongooseIM XMPP server • Riak database
- 62. Open source projects • RabbitMQ message broker • MongooseIM XMPP server • Riak database • CouchDB database
- 63. Erlang Community
- 64. Erlang Community Erlang Central • www.erlangcentral.org
- 65. Erlang Community Erlang Central • www.erlangcentral.org Erlang User Conference • Stockholm, June 2015
- 66. Erlang Community Erlang Central • www.erlangcentral.org Erlang User Conference • Stockholm, June 2015
- 67. Erlang Community Erlang Central • www.erlangcentral.org Erlang User Conference • Stockholm, June 2015 Lambda Academy • lambdaacademy.org, March-‐June 2015
- 68. Questions? ! Michał Ślaski @michalslaski