Java虚拟机(JVM)内部干些什么

最新推荐文章于 2024-09-08 23:26:58 发布

最新推荐文章于 2024-09-08 23:26:58 发布 · 197 阅读

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#java

本文介绍了Java虚拟机(JVM)的内部实现原理，包括字节码解释、JIT编译、垃圾回收等关键技术。演讲者Ian Rogers通过具体的例子，如Fibonacci数列的计算，展示了如何进行代码优化。

来自一家开发商业Java虚拟机的公司Azul Systems的Ian Rogers博士，2011年5月27日做了一次演讲叫“

Learn about JVM internals - what does the JVM do?

”。简单讲解了Java虚拟机内部实现的若干主要方面的问题，包括字节码解释，JIT编译，垃圾回收，Compaction等主要机制和挑战。

演讲的议题是：

The JVM from transisters up

- Interpreters

- A simple JIT compiler

- MOre complex compilers

Challenges and novel solutions in JVM design

- Object-oriented

- Class loading

- Garbage collectors

Zing

演讲中show了以下幻灯片(只列出标题)：

Presenter

Agenda

What is a Java Virtual Machine(JVM)?

Portability

The Interpreter

Looking inside an interpreter

Sources of inefficiency in the interpreter

A simple JIT compiler

Fibonacci 1

Fibonacci 2

Fibonacci 3

Fibonacci 4

Fibonacci 5

Fibonacci 6

Fibonacci 6 continued

Exploring Code Optimizations

Example 1: Dead code Eliminations

Exploring Code Optimizations

Example 2: Inlining

Exploring Code Optimizations

Example 2: Redundancy Removal

Example 3:low-level tree rewriting

Example 4:high-level tree rewriting

More optimizations

Challenges: Object-orientation

Adaptive optimizations

Summary on Portability, Compilers, and Optimizations

Challenges:Garbage Collection

Garbage Collection

Allocation & Garbage Collection

Garbage Collection

Generational Garbage Collection

Compaction

Pain of Tuning

Biggest Java Scalability Limitation

2c for the Road - What to (not) Think About

Summary

For the Curious: What is Zing?