如何减少jvm使用的线程数
[英]How to reduce the number of threads used by the jvm
问题描述
I'm running a single threaded Java app on the following java version: 
我在以下java版本上运行单线程Java应用程序：
java version "1.7.0_67"
Java(TM) SE Runtime Environment (build 1.7.0_67-b01)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)
with the -XX:+UseSerialGC option enabled. 启用-XX:+UseSerialGC选项。 Still when I start the application I see multiple threads starting when monitoring the system with htop . 仍然在我启动应用程序时，我看到在使用htop监视系统时会启动多个线程。 I'd like to reduce the number of processes started as much as possible since I have a use case which involves running multiple instances of this application and this will hit the roof of the maximum allowed number of process on the system that I'm running on. 我想尽可能减少启动的进程数，因为我有一个用例，它涉及运行此应用程序的多个实例，这将触及我正在运行的系统上允许的最大进程数量上。 Are there any other jvm options other than -XX:+UseSerialGC that I could use to reduce the number of threads starting? 除了-XX:+UseSerialGC之外是否还有其他jvm选项-XX:+UseSerialGC我可以用来减少线程的数量？
1 个解决方案
解决方案1
9 已采纳 2014-09-07 03:38:16
Apart from -XX:+UseSerialGC which disables Parallel or Concurrent GC, there are the following options to reduce the number of JVM threads: 除了-XX:+UseSerialGC禁用并行或并发GC之外，还有以下选项可以减少JVM线程的数量：
-
-XX:CICompilerCount=1leaves only one JIT compiler thread.-XX:CICompilerCount=1只留下一个JIT编译器线程。 -
-XX:+ReduceSignalUsagedisables Signal Dispatcher thread.-XX:+ReduceSignalUsage禁用Signal Dispatcher线程。 Eg JVM will not handle SIGQUIT to dump threads.例如，JVM不会处理SIGQUIT来转储线程。 -
-XX:+DisableAttachMechanismprevents AttachListener thread from starting.-XX:+DisableAttachMechanism阻止AttachListener线程启动。
In theory it is possible to disable even more threads (eg Service Thread and VM Periodic Task Thread) but this would require patching JVM. 从理论上讲，可以禁用更多线程（例如服务线程和VM周期任务线程），但这需要修补JVM。
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