Brewed for Speed: How Go’s Green Tea GC Works

In this talk, we explore the inner workings of Go’s garbage collector and the motivation behind the **GreenTea GC**, an experimental redesign that approaches memory cleanup differently. Starting from how Go’s current garbage collector and memory allocator cooperate, we’ll dive into the **page-based approach** of GreenTea, cleaning memory in groups instead of object-by-object, and discuss why it matters for performance on modern hardware with more cores and larger caches. You’ll learn **how it works**, **why it matters**, and what this new approach could mean for **real-world Go programs**.

You can see the full presentation here: https://www.youtube.com/watch?v=aQ9JsWyjRy8

Transcript

2. About Me • Software Engineer AT • Open Source Enthusiast (and contributor) • Deep knowledge Fan • Book Author • Blogger: https:/ /internals-for-interns.com/
3. Introduction • The Go GC • The Memory Allocator • The Green Tea GC
4. The Go Classic GC
5. The Go Classic GC
6. The Go Classic GC
7. The Go Classic GC
8. The Go Classic GC
9. The Go Classic GC
10. The Go Classic GC
11. The Go Classic GC
12. The Go Classic GC
13. The Go Classic GC
14. The Go Classic GC
15. The Go Classic GC
16. The Go Classic GC
17. The Go Classic GC
18. The Go Classic GC
19. The Go Classic GC
20. The Memory Allocator
21. The Memory Allocator
22. The Green tea Trick
23. The Green tea Trick
24. The Green tea Trick
25. The Green tea Trick
26. The Green tea Trick
27. The Green tea Trick
28. The Green tea Trick
29. The Green tea Trick
30. The Green tea Trick
31. The Green tea Trick
32. The Green tea Trick
33. The Green tea Trick
34. The Green tea Trick
35. The Green tea Trick
36. The Green tea Trick
37. Page Checking
38. = Page Checking
39. = Page Checking
40. = Page Checking
41. = Page Checking
42. = Page Checking
43. = Page Checking
44. = Page Checking
45. = Page Checking
46. = Page Checking
47. = Page Checking
48. The Hardware Boost
49. The Hardware Boost
50. The Hardware Boost =
51. The Hardware Boost =
52. The Hardware Boost =
53. The Hardware Boost =
54. The Hardware Boost =
55. The Catch
56. References • Michael Knyszek GopherCon Talk: https:/ /www.youtube.com/watch?v=gPJkM95KpKo • The Go.DEV Blog POST: https:/ /go.dev/blog/greenteagc • The Go Source Code
58. Let’s Keep in Touch jespinog jesus-espino jespino
59. Links ONA FOR OPEN SOURCE internals for interns Social Networks