ØMQ (ZeroMQ) provides a simple way to connect different codes across various transports like in-process, inter-process, TCP, and multicast. It uses a socket interface that supports common messaging patterns like request-reply, publish-subscribe, and task distribution. These sockets can be connected in a flexible topology to build scalable, concurrent applications that take advantage of multicore systems. ØMQ has language bindings for many languages and runs on most operating systems.

1. http://zero.mq/

2. A ØMQ socket is what you get when
you take a normal TCP socket, inject
it with a mix of radioactive isotopes
stolen from a secret Soviet atomic
research project, bombard it with
1950-era cosmic rays, and put it into
the hands of a drug-addled comic
book author with a badly-disguised
fetish for bulging muscles clad in
spandex. Yes, ØMQ sockets are the
world-saving superheros of the
networking world.

4. Problem

5. How to
easy connect
any code to any code,
anywhere

6. Existing solutions

7. Connect
• In-process in-proc://some-point
• Unix sockets ipc://some/pipe
• BSD sockets tcp://0.0.0.0:1234
• Others multicast (PGM) ...

8. BSD Sockets

9. BSD Protocols
TCP * Images by Tenouk

10. BSD Protocols
UDP
TCP
* Images by Tenouk

11. BSD Sockets
• New/Exit - socket() , close()
• Configure - setsockopt()
• Connect - bind() , connect()
• Use - send() , recv()

12. BSD Problems
• Need to choice of transport
• Stream (TCP) , datagram (UDP)
• Peer-2-Peer connections

14. zguide.zero.mq

15. A ØMQ socket is what you get when
you take a normal TCP socket, inject
it with a mix of radioactive isotopes
stolen from a secret Soviet atomic
research project, bombard it with
1950-era cosmic rays, and put it into
the hands of a drug-addled comic
book author with a badly-disguised
fetish for bulging muscles clad in
spandex. Yes, ØMQ sockets are the
world-saving superheros of the
networking world.

16. in a Hundred Words
ØMQ (ZeroMQ, 0MQ, zmq) looks like an embeddable
networking library but acts like a concurrency
framework.
It gives you sockets that carry whole messages across
various transports like in-process, inter-process, TCP, and
multicast.
You can connect sockets N-to-N with patterns like
fanout, pub-sub, task distribution, and request-reply. It's fast
enough to be the fabric for clustered products. Its
asynchronous I/O model gives you scalable multicore
applications, built as asynchronous message-processing tasks.
It has a score of language APIs and runs
on most operating systems.
ØMQ is from iMatix and is LGPL open source.

17. Many languages
* Images by iMatrix

18. Sockets
•Well known API
•Messages oriented
• Transport agnostic
•Socket-level topology

19. Well known API

20. BSD Sockets
• New/Exit - socket()
• Configure - setsockopt()
• Connect - bind()
• Use - send() , recv()

21. Sockets
• New/Exit - zmq_socket()
• Configure - zmq_setsockopt()
• Connect - zmq_bind()
• Use - zmq_send() , zmq_recv()

23. Hello world (server)

24. Hello world (client)

25. Message oriented

26. Message oriented
Send
Receive

27. Various transports

28. Various transports
• req.bind(‘inproc://some/pipe’)
• req.bind(‘ipc://some/pipe’)
• req.bind(’tcp://127.0.0.1:5555’)

29. Patterns
Socket level topology

30. Request - Reply
* Images by iMatrix

31. Publish - Subscribe
* Images by iMatrix

32. Parallel tasks
* Images by iMatrix

33. Demo

34. Scale

35. Start small
* Images by iMatrix

36. Bigger
* Images by iMatrix

37. And bigger...
* Images by iMatrix

38. Devices
Device
* Images by iMatrix

39. QUEUE
* Images by iMatrix

40. Demo

41. Implementation

42. Ruby-FFI
Foreign Function Interface

43. Ruby-FFI

44. Ruby-FFI (Win)

45. Why FFI?
•Debian: no need from *-dev
• Multi-platform
• Easy to read (Ruby, not C)

46. Projects
http://zeromq.org/docs:labs

47. http://mongrel2.org

49. Evolution
App App App
HTTP HTTP HTTP
Net Net Net
Webrick Mongrel Thin

50. Evolution
App
HTTP
Net
Mongrel2

51. Mongrel2
Push/Pull 0mq Pub/Sub
Handler
Handler Responses
Handler
Requests

52. Demo

53. Future
• Part of Linux kernel
• http://www.crossroads.io/
• zerocloud ?

54. Thank you!