STM

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Diego Pacheco

STM, dev,clojure,

Empresariales Tecnología

STM

@diego_pacheco
Software Architect | Agile Coach

Moore's law (Number os Transistors double ~2 years)

AMD Athlon 64 FX-53 CPU 2.4 GHz - Single CORE - 2005

Multithreaded: 2 General Categories

JOB JOB
Group
P1 P3
J1
P2 J2
J3

P4 P5 J4 J5

JOB JOB Group
DONE DONE

Current Models - LOCKS

Locks

Shared-Memory

OO

Surreal

Current Models - Actors

Actors

NO Shared Data

Async Messages Lightweight Threads

STM Implementations Guarantee NO:

Dead Locks

Livelock

Race Conditions

STM Issues:

Retry Waste: Lots of transactions retry

Overhead: Transaction Bookkeeping

Lack of Tools: Identify, learn, tunning, etc...

Clojure/Haskell: All Immutable

Everything is immutable!
Change: Always
Inside a Transaction.

Clojure STM Implementation
Multi-Version Concurrency Control (MVCC) + Snapshot isolation

Databases (Mysql, Postgress & Oracle),
Subversion,
EhCache, JBoss Cache
Clojure and several other solutions…

STM
Thank You!
@diego_pacheco
Software Architect | Agile Coach

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STM

1. STM @diego_pacheco Software Architect | Agile Coach

2. Moore's law (Number os Transistors double ~2 years)

3. AMD Athlon 64 FX-53 CPU 2.4 GHz - Single CORE - 2005

4. Single Thread App: It’s ALL OVER !!!

5. More Than one CORE: Dual, Quad, etc..

6. Concurrent Threads == Challenges

7. Order of operations is not fixed…

8. Difficult to repeat failures…

9. WE often don’t think this way…

10. Testing effort is bigger…

11. Multithreaded: 2 General Categories JOB JOB Group P1 P3 J1 P2 J2 J3 P4 P5 J4 J5 JOB JOB Group DONE DONE

12. Current Models Locks Actors STM

13. Current Models - LOCKS Locks Shared-Memory OO Surreal

14. Current Models - Actors Actors NO Shared Data Async Messages Lightweight Threads

15. Current Models - STM STM ACID

16. STM Implementations Guarantee NO: Dead Locks Livelock Race Conditions

17. STM Issues: Retry Waste: Lots of transactions retry Overhead: Transaction Bookkeeping Lack of Tools: Identify, learn, tunning, etc...

18. Clojure/Haskell: All Immutable Everything is immutable! Change: Always Inside a Transaction.

19. Clojure: Persistent Data Structures

20. Clojure STM Implementation Multi-Version Concurrency Control (MVCC) + Snapshot isolation Databases (Mysql, Postgress & Oracle), Subversion, EhCache, JBoss Cache Clojure and several other solutions…

21. STM Thank You! @diego_pacheco Software Architect | Agile Coach

STM

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