如何查看 java 正在使用哪个垃圾收集器

问题描述

Java 虚拟机支持多种垃圾收集策略.

这篇文章解释了它们.

现在我想知道我的应用程序正在使用哪种(自动选择的)策略，有没有办法让 JVM(1.6 版)打印这些信息?

JVM 检测它是处于客户端模式还是服务器模式.所以问题真的是我如何才能看到哪些已经被检测到?

解决方案

http://java.sun.com/j2se/1.5.0/docs/guide/vm/gc-ergonomics.html 也声明默认为并行收集器.

我们仅通过设置在 JVM 1.5 上测试过一次

-server -Xms3g -Xmx3g -XX:PermSize=128m -XX:LargePageSizeInBytes=4m -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps

输出显示

41359.597:[GC [PSYoungGen:90499K->32K(377344K)] 268466K->181862K(2474496K)，0.0183138 秒]41359.615:[完整 GC [PSYoungGen:32K->0K(377344K)][PSOldGen:181830K->129760K(2097152K)]181862K->129760K(2474496K)[PSPermGen:115335K->115335K->115335K(45)s.39]

其中 PS 代表并行清除

The Java Virtual Machine supports several garbage collection strategies.

This article explains them.

Now I am wondering which (automatically selected) strategy my application is using, is there any way to let the JVM(version 1.6) print this information?

Edit: The JVM detects if it is in client or server mode. So the question really is how can I see which has been detected?

解决方案

http://java.sun.com/j2se/1.5.0/docs/guide/vm/gc-ergonomics.html which is applicable for J2SE 6 as well states that the default is the Parallel Collector.

We tested this once on a JVM 1.5 by setting only

-server -Xms3g -Xmx3g -XX:PermSize=128m -XX:LargePageSizeInBytes=4m -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps

and the output showed

41359.597: [GC [PSYoungGen: 90499K->32K(377344K)] 268466K->181862K(2474496K), 0.0183138 secs]
41359.615: [Full GC [PSYoungGen: 32K->0K(377344K)] [PSOldGen: 181830K->129760K(2097152K)] 181862K->129760K(2474496K) [PSPermGen: 115335K->115335K(131072K)], 4.4590942 secs]

where PS stands for Parallel Scavenging

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