jvm

• An internal jvm trace point used by some advanced diagnostics
  ：某些进阶诊断使用的内部jvm追踪点。
• The monitor should work fine on any system that has a jvm
  该监视器可以在任何带有jvm的系统上运行。
• Jit is the most important jvm component in terms of performance
  就性能而言， jit是最重要的jvm组件。