jvm02 JVM垃圾回收性能调优的相关内容

JVM02——JVM垃圾回收与性能调优（下）（二）

(9)巨型对象巨型对象指大小大于region的一半的对象，在jdk8u60后，可以回收巨型对象。巨型对象有如下特别之处。G1不会复制巨型对象垃圾回收时优先回收当某个巨型对象被老年代的incoming引用为0时，将会在新生代垃圾回收时被回收(参考下图)。(10)动态调整阈值并发标记必须在堆占满前完成，...

JVM02——JVM垃圾回收与性能调优（下）（一）

标记清除可能会导致垃圾碎片过多，导致并发失败，CMS会退化为SerialOld，进行一次全面的垃圾整理。这无疑会造成很多的时间消耗，这也时CMS存在的一个问题。6.8.5 G1垃圾回收器JDK9的默认垃圾回收器，取代了之前的CMS垃圾回收器。(1)垃圾回收阶段首先是进行Young Collectio...

JVM02——JVM垃圾回收与性能调优（上）（三）

打印信息如下。Heap def new generation total 9216K, used 2311K [0x00000000fec00000, 0x00000000ff600000, 0x00000000ff600000) eden space 8192K, 28% used [0x0000...

JVM02——JVM垃圾回收与性能调优（上）（二）

public static void soft() { // list --> SoftReference --> byte[] List<SoftReference<byte[]>> list = new ArrayList<>(); Referen...

JVM02——JVM垃圾回收与性能调优（上）（一）

6.垃圾回收6.1 判断垃圾6.1.1 引用计数法当一个对象被引用一次则计数+1，失去引用计数-1，当计数为0则判断为垃圾。但当对象间存在循环引用时(如下图)会无法被回收。6.1.2 可达性分析算法Java中使用可达性分析算法来判断垃圾。肯定不会被垃圾回收的对象为根对象，可以经由根对象直接或间接引用...

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更新时间 2024-02-29 18:05:21

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