Go memory allocation

Transcript

1. Process Virtual Memory Resident set mheap P1(Logical Processor/Hardware Thread) Goroutine

   1 stack arena arena ... mcentral mcentral mcentral .. mcache mspan 8b mspan 16b mspan 32b mspan .. mspan .. mspan .. mspan .. mspan .. mspan 32768b mspan 8b (non empty) mspan 8b (empty) mspan 16b mspan 16b mspan mspan P2 G6 stack mcache .. .. .. .. Pn Gn stack mcache mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b

2. mspan mspan 8b 8b 8b 8b …. 8b 8b 8b

   1024 objects mspan 16b 16b 16b 16b …. 16b 16b 16b 512 objects mspan 32b 32b 32b 32b …. 32b 32b 32b 256 objects mspan 48b 48b 48b 48b …. 48b 48b 48b 170 objects mspan 32768 bytes 1 object mspan .. .. .. .. …. .. .. .. ...

3. Go Scheduler P M G Processor Core G G P

   = Logical Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) LRQ = Local Run Queue LRQ

4. Tiny allocation

5. Tiny allocation P1 M G2 Processor Core P = Logical

   Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 16b (non empty) mspan 16b (empty) mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 8b mspan 16b mspan 16b Tiny allocation slot 12b

6. Tiny allocation P1 M G2 Processor Core P = Logical

   Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 16b (non empty) mspan 16b (empty) mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 8b mspan 16b mspan 16b Tiny allocation slot 12b 4b

7. Tiny allocation P1 M G2 Processor Core P = Logical

   Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 16b (non empty) mspan 16b (empty) mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 8b mspan 16b mspan 16b Tiny allocation slot 12b 4b

8. Tiny allocation P1 M G2 Processor Core P = Logical

   Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 16b (non empty) mspan 16b (empty) mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 8b mspan 16b mspan 16b Tiny allocation slot 12b 4b 10b

9. Tiny allocation P1 M G2 Processor Core P = Logical

   Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 16b (non empty) mspan 16b (empty) mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 8b mspan 16b mspan 16b Tiny allocation slot 12b 4b 10b

10. Tiny allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 16b (non empty) mspan 16b (empty) mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 8b mspan 16b mspan 16b Tiny allocation slot 12b 4b 10b

11. Tiny allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 16b (non empty) mspan 16b (empty) mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 8b mspan 16b mspan 16b Tiny allocation slot 12b 4b 10b 12b

12. Tiny allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 16b (non empty) mspan 16b (empty) mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 8b mspan 16b mspan 16b Tiny allocation slot 12b 4b 10b 12b No free mspan 16b

13. Tiny allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 16b (non empty) mspan 16b (empty) mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 8b mspan 16b mspan 16b Tiny allocation slot 12b 4b 10b 12b

14. Tiny allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 16b (non empty) mspan 16b (empty) mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 8b mspan 16b mspan 16b Tiny allocation slot 12b 4b 10b 12b

15. Tiny allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 16b (non empty) mspan 16b (empty) mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 16b mspan 8b mspan 16b mspan 16b Tiny allocation slot 12b 4b 10b 12b

16. Small allocation

17. Small allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 32b (non empty) mspan 32b (empty) mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b mspan 8b mspan 16b mspan 32b Tiny allocation slot 12b

18. Small allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 8b mspan 16b mspan 32b Tiny allocation slot 12b 20b mspan 32b (non empty) mspan 32b (empty) mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b

19. Small allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 8b mspan 16b mspan 32b Tiny allocation slot 12b 20b mspan 32b (non empty) mspan 32b (empty) mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b

20. Small allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 8b mspan 16b mspan 32b Tiny allocation slot 12b 20b 32b No free mspan 32b mspan 32b (non empty) mspan 32b (empty) mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b

21. Small allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 8b mspan 16b mspan 32b Tiny allocation slot 12b 20b 32b No free mspan 32b mspan 32b (non empty) mspan 32b (empty) mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b

22. Small allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 8b mspan 16b mspan 32b Tiny allocation slot 12b 20b 32b mspan 32b (non empty) mspan 32b (empty) mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b

23. Small allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 8b mspan 16b mspan 32b Tiny allocation slot 12b 20b mspan 32b (non empty) mspan 32b (empty) mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b mspan 32b 32b

24. Large allocation

25. Large allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 8b mspan 16b mspan 32b Tiny allocation slot 12b 20b mspan 32b 32b

26. Large allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 8b mspan 16b mspan 32b Tiny allocation slot 12b 20b mspan 32b 32b 40Kb

27. Large allocation P1 M G2 Processor Core P = Logical

    Processor per Hardware Thread M = Machine per OS Thread G = Goroutine (Coroutine) mcache mheap arena mcentral mspan 8b (non empty) mspan 8b (empty) mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mspan 8b mcentral mspan 8b mspan 16b mspan 32b Tiny allocation slot 12b 20b mspan 32b 32b mspan 40Kb