不同的（HotSpot）JVM线程类型有什么作用？ [英] What do the different (HotSpot) JVM thread types do?

问题描述

我看到HotSpot JVM中实现了六种线程类型：VMThread，CGCThread，PGCThread，JavaThread，CompilerThread和WatcherThread。但是我不知道哪种线程类型正在做什么。这是我到目前为止所理解的：

I see there are six thread types implemented into the HotSpot JVM: VMThread, CGCThread, PGCThread, JavaThread, CompilerThread and WatcherThread. However I don't know which thread type is doing what exactly. Here is what I understood so far:

• VMThread：运行垃圾收集器等VM任务。


• CGCThread：并发垃圾收集器。


• PGCThread：并行垃圾收集器（与CGC的区别？）。


• JavaThread：程序的线程，我想。 / li>
  
• CompilerThread：编译器的线程？


• WatcherThread：？

• VMThread: run VM tasks like the garbage collector.
• CGCThread: Concurrent garbage collector.
• PGCThread: Parallel garbage collector (differences with CGC?).
• JavaThread: Program's threads, I guess.
• CompilerThread: A thread for the compiler?
• WatcherThread: ?

其他问题：其他JVM怎么样？

Additional question: what about other JVMs?

推荐答案

您可以在 OpenJDK网站：

VM线程的主要种类如下：

The main kinds of VM threads are as follows:

• VM线程：VMThread的这个单例实例负责执行VM操作，这将在下面讨论


• 定期任务线程：WatcherThread的这个单例实例模拟计时器中断，用于在
  内执行定期操作VM


• GC线程：这些线程，不同类型，支持并行和并发垃圾收集


• 编译器线程：这些线程执行字节码到本机代码的运行时编译


• 信号调度她的线程：该线程等待进程指示信号并将它们分派给Java级信号处理方法

• VM thread: This singleton instance of VMThread is responsible for executing VM operations, which are discussed below
• Periodic task thread: This singleton instance of WatcherThread simulates timer interrupts for executing periodic operations within the VM
• GC threads: These threads, of different types, support parallel and concurrent garbage collection
• Compiler threads: These threads perform runtime compilation of bytecode to native code
• Signal dispatcher thread: This thread waits for process directed signals and dispatches them to a Java level signal handling method

您可能希望阅读整个线程管理段落，因为它会继续进一步解释，例如VM线程负责的是什么。

You might want to read the whole Thread Management paragraph since it continues further explanations, e.g. what the VM thread is responsible for.

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