默认情况下，当前的HotSpot JVM是否并行运行? [英] Does the current HotSpot JVM run in parallel by default?

问题描述

我正在使用此Java版本:

I'm using this Java version:

java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.3) (suse-9.1-x86_64)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

当我启动Java程序时，例如

When I start a java program, e.g.

java TestApp

默认情况下，JVM是否可以并行运行?

by default, will the JVM run in parallel ?

如果是这样，哪些部分并行运行?

If so, which parts run in parallel ?

对此我很感兴趣，因为我发现如果我使用taskset -c 0 java TestApp绑定在processor 0上运行的TestApp，则第一次运行时间要比java TestApp慢得多.这暗示着什么吗?

I am interested in this, because I found if I use taskset -c 0 java TestApp to bind TestApp running on processor 0, the first running time is much slower than java TestApp. Does this imply something?

推荐答案

有许多具有自己线程的单线程任务.

There are a number of single threaded tasks which have a thread of their own.

• 运行程序的主线程
• 本机编译器的后台字节码
• 终结器线程(以在对象上调用finalize())
• GC线程池

您的代码将只使用您创建的线程数(加上为您创建的"main"线程)

Your code will only use as many threads as you create (plus "main" which created for you)

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