显示为XX:ParallelGCThreads选择的默认值 [英] Show the default value chosen for XX:ParallelGCThreads

问题描述

我正在调整Java 8的JVM，并且试图知道为参数-XX:ParallelGCThreads定义了什么值. 文档说:

I'm tuning the JVM of Java 8 and I'm trying to know what value was defined for the parameter -XX:ParallelGCThreads. The documentation says:

-XX:ParallelGCThreads :设置垃圾回收器并行阶段使用的线程数.默认值因运行JVM的平台而异.

-XX:ParallelGCThreads: Sets the number of threads used during parallel phases of the garbage collectors. The default value varies with the platform on which the JVM is running.

我想知道我的平台中定义了什么值，以及是否需要更改它.在这种环境下，我没有可用的JDK，只有JRE.

I would like to know what value was defined in my platform and if I need to change that. I don't have in this environment a JDK available, only the JRE.

推荐答案

默认值:

 java -XX:+PrintFlagsFinal | grep ParallelGCThreads
 uint  ParallelGCThreads                        = 4

如果您有一个正在运行的进程jinfo <processId>，如果输出中不存在该进程，则该进程将使用默认值(在VM Flags下查看)

If you have a running process jinfo <processId>, if it's not present in the output, it is using the default value (look under VM Flags)

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