1.Java @ 

2.0x1, 

3.GreenTea JUG 2018-03 http://greenteajug.cn/ 

4.

5.

6. Hardware OPS Stable Session Pause-less based KPI Perf Multiple Non-volatile languages Cost Manual 

7.

8.“ ” 

9.GC 

10.

11.Java Spring FastJson DAO …… App Server Magic JDK JVM 

12.• • • • • 

13.• JDK • • • 90% • • C4 

14.0x2, 

15.: Hbase Bucket Cache 0xfffa0120… offset Bucket Cache (byte array) 

16.: GCIH (GC Invisible Heap) 0xfffa000.. GCIH Obj Obj Obj 0xfffb000.. Java heap 0xffff000.. 

17. …… • • • • … • Epsilon GC • http://openjdk.java.net/jeps/318 

18. …. • Java Delete • delete • Java HEAP Java HEAP • GC + Delete • New + Delete New Delete BridgedCHeap https://github.com/luchsh/bridgedCHeap 

19.0x3, 

20.RI • ZGC • • • throughput • RI GC • Load barrier • 15% throughput 

21. 4TB 4TB 4TB 4TB 42 64 

22.• Java GC • Project Valhalla 

23.• Eden Survivor • heap • OLD • • • • Code cache Metaspace • C-HEAP Stack Static 

24. profiling • • GC Log APM • • Allocation site • • • • 

25.• profile • TLAB JIT • • Stack • Age • Object move 

26.0 Nursery Tenured 

27.0 0 0 0 

28.• • Gc • VM • • • • • throughput ! VM APP 

29. Eden Survivor NewGen JVM JVM Old PermHeap