"long" Loops with JIT Compilation

This section provides a tutorial example on benchmark testing of 'long' operations in loops with JIT compilation.

Now let's repeat those "long" test methods with JIT compilation and these parameters:

Here are test results:

C:\herong\jvm>java -Xms100m -Xmx100m
   BenchmarkRunner BenchmarkTestLong emptyLoop 10000 100 1000000
...
Runs: 100, Ave: 2, Min: 2, Max: 2 - Per step in nanoseconds

C:\herong\jvm>java -Xms100m -Xmx100m
   BenchmarkRunner BenchmarkTestLong assignment 10000 100 1000000
...
Runs: 100, Ave: 3, Min: 3, Max: 3 - Per step in nanoseconds

C:\herong\jvm>java -Xms100m -Xmx100m
   BenchmarkRunner BenchmarkTestLong shift 10000 100 1000000
...
Runs: 100, Ave: 4, Min: 4, Max: 4 - Per step in nanoseconds

C:\herong\jvm>java -Xms100m -Xmx100m
   BenchmarkRunner BenchmarkTestLong add 10000 100 1000000
...
Runs: 100, Ave: 3, Min: 3, Max: 3 - Per step in nanoseconds

C:\herong\jvm>java -Xms100m -Xmx100m
   BenchmarkRunner BenchmarkTestLong multiply 10000 100 1000000
...
Runs: 100, Ave: 5, Min: 5, Max: 5 - Per step in nanoseconds

C:\herong\jvm>java -Xms100m -Xmx100m
   BenchmarkRunner BenchmarkTestLong division 10000 100 1000000
...
Runs: 100, Ave: 24, Min: 24, Max: 25 - Per step in nanoseconds

No surprises here:

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

 "int" Loops with JIT Compilation

"long" Loops with JIT Compilation

 Performance Improvements of JIT Compilation

 Micro Benchmark Tests on "float" and "double" Operations

 Outdated Tutorials

 References

 PDF Printing Version