28. JVM Internals and Performance Tuning
The Java Virtual Machine (JVM) serves as a vital component of the Java platform, providing memory management, bytecode execution, and class loading. This chapter explores the architecture and internal functioning of the JVM, along with advanced techniques for performance tuning. Understanding these concepts enables developers to optimize their applications, troubleshoot effectively, and enhance system performance in production environments.
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What we have learnt
- The JVM is a specification that provides a platform-independent runtime environment for Java applications.
- Key components of the JVM include the Class Loader Subsystem, Runtime Data Areas, Execution Engine, and Garbage Collector.
- Performance monitoring and tuning techniques are essential for optimizing JVM applications.
Key Concepts
- -- JVM Architecture
- A framework defining the abstract machine that interprets Java bytecode.
- -- Garbage Collection (GC)
- An automatic memory management feature in Java that reclaims memory by removing objects that are no longer in use.
- -- JustInTime Compiler (JIT)
- A component that converts bytecode into native machine code to improve execution speed.
- -- Heap Tuning
- The process of optimizing memory allocation in the JVM's heap space to improve application performance.
- -- Memory Leaks
- A common issue where memory is not released properly, leading to increased consumption and potential application failure.
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