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
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