Adventures with Concurrent Programming in Java: A Quest for Predictable Latency

on YouTube ↗47m

" summary

Claims concrete latency and scalability tradeoffs, measured not promised: 167 ns baseline for a lockfree one-to-one ring buffer, blocking condition-variable handoffs that spike to 5 ms outlier and tens of microseconds, and 100-message bursts that push blocking queues to ~180 µs. Implements lockfree rings, a process-shared ring file for IPC, and Aeron-style rotating buffers using xadd-style atomics and background zeroing; results show ring buffers and Aeron reduce tail contention to ~34 µs under load. Code and benchmarks (Disruptor Aeron SBE) are on GitHub and actually run.

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" chapters (44)

1. 0:00Introduction
2. 0:46A Quest for Predictable Latency
3. 1:20Being Responsive
4. 1:42Agenda
5. 2:44Blocking
6. 3:10Exclusion
7. 3:29Systemic Pauses
8. 4:33Concurrent Algorithms
9. 5:54Service Time
10. 7:12Queue Theory
11. 8:48Message Passes
12. 9:51Condition variables
13. 10:22Measuring condition variables
14. 11:07Microseconds
15. 12:54Measuring Microseconds
16. 13:38Scientific Method
17. 17:34Concurrent Link
18. 18:44InterThread FIFO
19. 19:04Disruptor
20. 20:48Cursor
21. 22:45Demo
22. 24:06The Head Independent
23. 25:15The Numbers
24. 26:38The Disruptors
25. 26:52How do I work across processes
26. 27:22How do I consume
27. 28:05The header
28. 28:48Cleanup operation
29. 29:12Concurrent messaging
30. 30:28One big file that goes on forever
31. 31:15Rotating the buffers
32. 31:25Moving forward
33. 34:03Readers
34. 34:25Zeroing
35. 34:47Predictable Latency
36. 36:33False Sharing
37. 37:43LockAx Art
38. 38:25Logging
39. 39:30Learnings
40. 41:12Memory copying
41. 43:17AXE
42. 43:57GitHub
43. 44:10Questions
44. 44:37Atomic Operations

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