JVM Tutorials - Herong's Tutorial Examples

∟Micro Benchmark Tests in JIT Compilation Mode

This chapter provides tutorial notes and example codes on micro benchmark tests on 'int' and 'long' data type operations in HotSpot JIT compilation mode. Topics include empty loop, assignment loop, shift operation, add operation, multiplication operation and division operation.

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"int" Loops with JIT Compilation

"long" Loops with JIT Compilation

Performance of JIT on "int/long" Operations

"int/long" Operation Comparison between Systems

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Takeaways:

• HotSpot JIT compilation reduces execution time by about 10 times on some simple "int" or "long" operations.
• In JIT compilation mode, "long" operations are still slower than "int" operations.
• Above results were collected on my Windows 7 computer with Intel Core i5-6200U CPU @ 2.30Ghz with 4.00 GB of RAM.

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

 Archived Tutorials

 References

 Full Version in PDF/EPUB

Micro Benchmark Tests in JIT Compilation Mode - Updated in 2022, by Dr. Herong Yang