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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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