第 8 章堆

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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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