为什么Java会产生这么多进程? [英] Why does Java spawn so many processes?
问题描述
我编写了一个在debian 7 vserver上运行的Java服务器应用程序。该应用程序本身可以正常运行,但是我注意到一些非常奇怪的东西。
I've written a Java server application that I run on a debian 7 vserver. The application itself workes just fine, but I notices something very strange.
在调用 java -Xmx200M -jar CCU.jar
我希望看到一个Java进程正在运行我的 CCU.jar
。
After calling java -Xmx200M -jar "CCU.jar
I'd expect to see one Java process running my CCU.jar
.
调用 top
只有一个Java进程(如预期),但是当我调用 htop
时,我得到了:
When calling top
there is just one java process (as expected). But when I call htop
I get this:
所有这些看起来都相同的子流程(它们具有表中显示的数据完全相同)却具有不同的PID呢?
What are all these subprocesses that seem to be the same process (they have the exactly same data showed in the table) but have different PIDs?
推荐答案
Java应用程序永远不会是单线程的(垃圾收集器线程除外),因此您总是会遇到多个线程。此外,Linux将线程实现为轻量级进程,因此,每个Java线程都将显示为具有唯一性的进程PID在 htop
中。
A java application is never single threaded (Garbage Collector thread among other). So you always end up with several thread. Moreover, Linux implement thread as Light-weight process therefore, each Java thread will appear as a process with a unique PID in htop
.
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