标签：打印 generated font class nal asp code details big
1. 引用计数GC算法
每个对象都会有对应的计数器来计算对象引用，但JVM不会采用该策略，因为不能解决对象相互引用的回收。
public class ReferenceCountingGC { public Object instance = null; private static final int _1M = 1024 * 1024; private byte[] bigSize = new byte[2 * _1M]; public static void main(String[] args) { // TODO Auto-generated method stub ReferenceCountingGC objA = new ReferenceCountingGC(); ReferenceCountingGC objB = new ReferenceCountingGC(); objA.instance = objB; objB.instance = objA; objA = null; objB = null; //GC System.gc(); } }
设置VM参数，打印GC日志
-XX:+PrintGC
-XX:+PrintGCDetails
部分GC日志：
[GC (System.gc()) [PSYoungGen: 6758K->584K(38400K)] 6758K->592K(125952K), 0.0015223 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] [Full GC (System.gc()) [PSYoungGen: 584K->0K(38400K)] [ParOldGen: 8K->515K(87552K)] 592K->515K(125952K), [Metaspace: 2554K->2554K(1056768K)], 0.0048039 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
[GC (System.gc()) [PSYoungGen: 6758K->584K(38400K)] 6758K->592K(125952K), 0.0015223 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] [Full GC (System.gc()) [PSYoungGen: 584K->0K(38400K)] [ParOldGen: 8K->515K(87552K)] 592K->515K(125952K), [Metaspace: 2554K->2554K(1056768K)], 0.0048039 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
标签：打印 generated font class nal asp code details big
原文地址：https://www.cnblogs.com/hello-yz/p/10488864.html
