Java performance: What's the big deal? - Trisha Gee

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It seems that everywhere you look these days people are needing to work on high performance/low latency applications. If they're not already working on them, then they want to be. But what do you really need to know when you're working on performance-sensitive systems? Where do you get started? In this session, Trisha outlines things you need to consider when thinking about performance, covers some of the frequently-asked questions, and notes the pitfalls and common traps that developers fall into.

Technology

Java Performance
What’s the big deal?
Trisha Gee, Developer
@trisha_gee
mechanitis.blogspot.com

Wednesday, 17 October 12

Who are you and what
do you want?

Wednesday, 17 October 12

So, performance....

• Where do I start?
• Things to consider...
• Frequently asked questions
• What Not To Do
• Questions?

Wednesday, 17 October 12

Where do I start?

Wednesday, 17 October 12

Do you
really
care?

Wednesday, 17 October 12

Do you care about...?

• Latency

Wednesday, 17 October 12

Do you care about...?

• Throughput

Wednesday, 17 October 12

Do you care about...?

• Responsiveness

Wednesday, 17 October 12

Do you care about...?

• Stability

Wednesday, 17 October 12

Do you care about...?

• Restricted hardware

Wednesday, 17 October 12

NFRs Are Not Evil

• 99.99% of all orders processed in less than 10ms

• 7000 tweets per second

• Pages load in less than 0.1 seconds

• Must be able to fail over in less than 10 seconds

• 2000 price updates per second with 99% latency of <10ms

Wednesday, 17 October 12

Considerations

Wednesday, 17 October 12

The Real World

Wednesday, 17 October 12

Mechanical Sympathy

Wednesday, 17 October 12

Testing

• “Performance” testing
• Load testing
• Red Line / Capacity
• Stress testing

Wednesday, 17 October 12

Where are your bottlenecks?

Wednesday, 17 October 12

Planning for the Future

Wednesday, 17 October 12

Questions
• Why Java?

Wednesday, 17 October 12

Questions
• Why Java?
• How does technology x compare to
technology y?

Wednesday, 17 October 12

Questions
• Why Java?
• How does technology x compare to
technology y?
• How can I run multi-threaded / in parallel?

Wednesday, 17 October 12

Questions
• Why Java?
• How does technology x compare to
technology y?
• How can I run multi-threaded / in parallel?
• Can I throw more hardware at it?

Wednesday, 17 October 12

Questions
• Why Java?
• How does technology x compare to
technology y?
• How can I run multi-threaded / in parallel?
• Can I throw more hardware at it?
• How do I speed up <item out of my control>?

Wednesday, 17 October 12

Common Pitfalls

Wednesday, 17 October 12

Myth Based Development

Wednesday, 17 October 12

It Works On My Machine

Wednesday, 17 October 12

Misleading Microbenchmarks

Wednesday, 17 October 12

Proﬁler Is God

Wednesday, 17 October 12

More Hardware Required

Wednesday, 17 October 12

Too Smart For New Hardware

Wednesday, 17 October 12

Disregarding the Laws of
Physics

Wednesday, 17 October 12

The Never Ending Story

Wednesday, 17 October 12

Java Stuff

• The Garbage Collector Is Not Your Enemy
• The JVM Is Smarter Than You
• Synchronized Is Evil
• Don’t Forget The Machine
• ...it might not be your code

Wednesday, 17 October 12

In Summary

• What is is you really care about?
• The real world matters
• There is no magic bullet

Wednesday, 17 October 12

Science, Not Art

Wednesday, 17 October 12

Resources

• We Don’t Need No Stinkin’ Locks! -
3:45pm (now)
• Are your GC Logs Speaking to You? 3:45pm
(now - typical)
• Martin’s Performance Myths presentation
• Kirk’s Performance Tuning course
• Coding the Architecture
• http://is.gd/javaperf
Wednesday, 17 October 12

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Java performance: What's the big deal? - Trisha Gee

1. Java Performance What’s the big deal? Trisha Gee, Developer @trisha_gee mechanitis.blogspot.com Wednesday, 17 October 12

2. Who are you and what do you want? Wednesday, 17 October 12

3. So, performance.... • Where do I start? • Things to consider... • Frequently asked questions • What Not To Do • Questions? Wednesday, 17 October 12

4. Where do I start? Wednesday, 17 October 12

5. Do you really care? Wednesday, 17 October 12

6. Do you care about...? • Latency Wednesday, 17 October 12

7. Do you care about...? • Throughput Wednesday, 17 October 12

8. Do you care about...? • Responsiveness Wednesday, 17 October 12

9. Do you care about...? • Stability Wednesday, 17 October 12

10. Do you care about...? • Restricted hardware Wednesday, 17 October 12

11. NFRs Are Not Evil • 99.99% of all orders processed in less than 10ms • 7000 tweets per second • Pages load in less than 0.1 seconds • Must be able to fail over in less than 10 seconds • 2000 price updates per second with 99% latency of <10ms Wednesday, 17 October 12

12. Latency Wednesday, 17 October 12

13. Latency Wednesday, 17 October 12

14. Considerations Wednesday, 17 October 12

15. Cost / Beneﬁt Wednesday, 17 October 12

16. The Real World Wednesday, 17 October 12

17. Mechanical Sympathy Wednesday, 17 October 12

18. Testing • “Performance” testing • Load testing • Red Line / Capacity • Stress testing Wednesday, 17 October 12

19. Where are your bottlenecks? Wednesday, 17 October 12

20. Planning for the Future Wednesday, 17 October 12

21. Planning for the Future Wednesday, 17 October 12

22. Planning for the Future Wednesday, 17 October 12

23. Planning for the Future Wednesday, 17 October 12

24. Planning for the Future Wednesday, 17 October 12

25. Compromises Wednesday, 17 October 12

26. FAQs Wednesday, 17 October 12

27. Questions Wednesday, 17 October 12

28. Questions • Why Java? Wednesday, 17 October 12

29. Questions • Why Java? • How does technology x compare to technology y? Wednesday, 17 October 12

30. Questions • Why Java? • How does technology x compare to technology y? • How can I run multi-threaded / in parallel? Wednesday, 17 October 12

31. Questions • Why Java? • How does technology x compare to technology y? • How can I run multi-threaded / in parallel? • Can I throw more hardware at it? Wednesday, 17 October 12

32. Questions • Why Java? • How does technology x compare to technology y? • How can I run multi-threaded / in parallel? • Can I throw more hardware at it? • How do I speed up <item out of my control>? Wednesday, 17 October 12

33. Questions • Why Java? • How does technology x compare to technology y? • How can I run multi-threaded / in parallel? • Can I throw more hardware at it? • How do I speed up <item out of my control>? • Where’s my magic bullet? Wednesday, 17 October 12

34. Common Pitfalls Wednesday, 17 October 12

35. Tune By Gut Wednesday, 17 October 12

36. Myth Based Development Wednesday, 17 October 12

37. It Works On My Machine Wednesday, 17 October 12

38. Misleading Microbenchmarks Wednesday, 17 October 12

39. Proﬁler Is God Wednesday, 17 October 12

40. More Hardware Required Wednesday, 17 October 12

41. Too Smart For New Hardware Wednesday, 17 October 12

42. Disregarding the Laws of Physics Wednesday, 17 October 12

43. The Never Ending Story Wednesday, 17 October 12

44. OK ﬁne... Wednesday, 17 October 12

45. Java Stuff • The Garbage Collector Is Not Your Enemy • The JVM Is Smarter Than You • Synchronized Is Evil • Don’t Forget The Machine • ...it might not be your code Wednesday, 17 October 12

46. In Summary Wednesday, 17 October 12

47. In Summary • What is is you really care about? • The real world matters • There is no magic bullet Wednesday, 17 October 12

48. Science, Not Art Wednesday, 17 October 12

49. Questions? Wednesday, 17 October 12

50. Resources • We Don’t Need No Stinkin’ Locks! - 3:45pm (now) • Are your GC Logs Speaking to You? 3:45pm (now - typical) • Martin’s Performance Myths presentation • Kirk’s Performance Tuning course • Coding the Architecture • http://is.gd/javaperf Wednesday, 17 October 12

Java performance: What's the big deal? - Trisha Gee

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Java performance: What's the big deal? - Trisha Gee