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第 8 章 堆
阅读量:178 次
发布时间:2019-02-28

本文共 1395 字,大约阅读时间需要 4 分钟。

?

1???????

??Java????JVM???????????????Java???????JVM?????????????????????JVM?????????????????????????????????Eden???????Survivor From???????Survivor To??????????????????????

1.1??????

  • ???????????????????????Thread Local Allocation Buffer?TLAB?????????
  • ????JVM???????????????????????????????
  • ?Java??????????????????????????????????????????????

1.2??????

  • ??Java VisualVM??????????
  • ??????????????????jstat??JVM????-XX:+PrintGCDetails????

1.3??????

  • Java 7???????????Young Generation??????Old Generation??????Permanent Generation??
  • Java 8???????????????????Meta Space??

2????????? OOM

  • ???????????-Xms????????-Xmx????????
  • ??????????????1/64???????????1/4?
  • ???????????????????????????????????

3????????

  • ????Young Generation????????????????????????????
  • ????Old Generation????????????????Minor GC?Major GC???????

4???????

  • ???????????????????????Minor GC?
  • Minor GC??????????????????????????Minor GC?
  • ???????????15??????????????

5???????

  • Minor GC????????????????????
  • Major GC/Major GC???????????????????????Full GC?
  • Full GC??????????????????????????

6????????

  • ?????????????????????
  • ????????????????????????????

7???????

  • TLAB???????????????????????
  • ??????????????????????????????

8??????????

  • ????????????????????????????????
  • ??????????????????????????????

9?????

  • ??????????????????????
  • ????????????????

10????

  • ??Java???????????????????????????????
  • TLAB???????????????????
  • Minor GC???Major GC?Full GC???????

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