"double" Operations without JIT Compilation

This section provides performance test results of 'double' operations without JIT compilation - interpreted-only mode.

Let's start with the interpreted-only mode on "double" operations using these parameters to control my tests:

Here are test results:

C:\herong\jvm>java -Xms100m -Xmx100m -Xint
   BenchmarkRunner BenchmarkTestFloat emptyLoop 10000 100 1000000
...
Runs: 100, Ave: 32, Min: 32, Max: 33 - Per step in nanoseconds

C:\herong\jvm>java -Xms100m -Xmx100m -Xint
   BenchmarkRunner BenchmarkTestFloat assignment 10000 100 1000000
...
Runs: 100, Ave: 39, Min: 39, Max: 40 - Per step in nanoseconds

C:\herong\jvm>java -Xms100m -Xmx100m -Xint
   BenchmarkRunner BenchmarkTestFloat add 10000 100 1000000
...
Runs: 100, Ave: 63, Min: 62, Max: 66 - Per step in nanoseconds

C:\herong\jvm>java -Xms100m -Xmx100m -Xint
   BenchmarkRunner BenchmarkTestFloat multiply 10000 100 1000000
...
Runs: 100, Ave: 57, Min: 57, Max: 61 - Per step in nanoseconds

C:\herong\jvm>java -Xms100m -Xmx100m -Xint
   BenchmarkRunner BenchmarkTestFloat division 10000 100 1000000
...
Runs: 100, Ave: 70, Min: 70, Max: 72 - Per step in nanoseconds

Surprisingly, the multiply loop runs faster than the add loop!

Last update: 2010.

Table of Contents

 About This Book

 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

 Sun's JVM - Java HotSpot VM

 JRockit JVM 28.2.7 by Oracle Corporation

 JVM Runtime Data Areas

 Memory Management and Garbage Collectors

 Garbage Collection Tests

 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

 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

 Performance Improvements of JIT Compilation

 Outdated Tutorials

 References

 PDF Printing Version