CDS (Class Data Sharing)
This chapter provides tutorial notes and example codes on CDS (Class Data Sharing). Topics include generating shared archive with HotSpot; saving startup time and footprint using shared archive; viewing shared memory of JVM processes.
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What Is Class Data Sharing
Regenerating Shared Archive
Startup Time Saving with Restoring Shared Archive
Startup Time Saving with Multiple JVM Processes
Footprint Saving with Restoring Shared Archive
Viewing Shared Memory of JVM Processes
- Class Data Sharing (CDS) is a feature introduced HotSpot JVM 1.5 to
to reduce the startup time and footprint of JVM instances by
using a shared archive of commonly used standard classes.
- "-Xshare:dump" option can be used to regenerate the Shared Archive.
- "-Xshare:off" option can be used to turn off the Class Data Sharing function.
In this case all classes will be loaded normally.
Table of Contents
About This Book
JVM (Java Virtual Machine) Specification
Java HotSpot VM - JVM by Oracle/Sun
java.lang.Runtime Class - The JVM Instance
java.lang.System Class - The Operating System
ClassLoader Class - Class Loaders
Class Class - Class Reflections
JVM Runtime Data Areas
JVM Stack, Frame and Stack Overflow
Thread Testing Program and Result
CPU Impact of Multi-Thread Applications
I/O Impact of Multi-Thread Applications
►CDS (Class Data Sharing)
Micro Benchmark Runner and JVM Options
Micro Benchmark Tests on "int" Operations
Micro Benchmark Tests on "long" Operations
Micro Benchmark Tests in JIT Compilation Mode
Micro Benchmark Tests on "float" and "double" Operations
OpenJ9 by Eclipse Foundation
JRockit JVM 28.2.7 by Oracle Corporation
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