JVM Tutorials - Herong's Tutorial Examples - Version 4.23, by Dr. Herong Yang
"double" Operations with JIT Compilation
This section provides performance test results of 'double' operations without JIT compilation - interpreted-only mode.
Let's continue with the JIT compilation mode on "double" operations using these parameters to control my tests:
Here are test results:
C:\herong\jvm>java -Xms100m -Xmx100m BenchmarkRunner BenchmarkTestDouble emptyLoop 10000 100 1000000 ... Runs: 100, Ave: 2, Min: 2, Max: 2 - Per step in nanoseconds C:\herong\jvm>java -Xms100m -Xmx100m BenchmarkRunner BenchmarkTestDouble assignment 10000 100 1000000 ... Runs: 100, Ave: 4, Min: 4, Max: 4 - Per step in nanoseconds C:\herong\jvm>java -Xms100m -Xmx100m BenchmarkRunner BenchmarkTestDouble add 10000 100 1000000 ... Runs: 100, Ave: 2, Min: 2, Max: 2 - Per step in nanoseconds C:\herong\jvm>java -Xms100m -Xmx100m BenchmarkRunner BenchmarkTestDouble multiply 10000 100 1000000 ... Runs: 100, Ave: 2, Min: 2, Max: 2 - Per step in nanoseconds C:\herong\jvm>java -Xms100m -Xmx100m BenchmarkRunner BenchmarkTestDouble division 10000 100 1000000 ... Runs: 100, Ave: 16, Min: 16, Max: 16 - Per step in nanoseconds
Surprisingly, the assignment with add loop runs faster than the assignment-only loop!
Last update: 2010.
Table of Contents
Downloading and Installing JDK 1.8.0 on Windows
Downloading and Installing JDK 1.7.0 on Windows
java.lang.Runtime Class - The JVM Instance
java.lang.System Class - The Operating System
ClassLoader Class - Class Loaders
Class Class - Class Reflections
JRockit JVM 28.2.7 by Oracle Corporation
Memory Management and Garbage Collectors
JVM Stack, Frame and Stack Overflow
Thread Testing Program and Result
CPU Impact of Multi-Thread Applications
I/O Impact of Multi-Thread Applications
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
Benchmark Test Methods for "float" Operation
"float" Operations without JIT Compilation
"float" Operations with JIT Compilation
Benchmark Test Methods for "double" Operation
"double" Operations without JIT Compilation
►"double" Operations with JIT Compilation