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Parallel Collector GC Log Message Format
This section describes the GC log message format of HotSpot JVM Parallel Collector.
2022-10-01, ∼400🔥, 0💬

I/O Impact of Multi-Thread Applications
This chapter provides tutorial notes and example codes on I/O impact of multi-thread Java applications. Topics include I/O intensive thread test class, FileEditor2.java; running multiple I/O threads on HotSpot and JRockit JVM.
2022-10-01, ∼398🔥, 0💬

Micro Benchmark Tests on "float" and "double" Operations
This chapter provides tutorial notes and example codes on micro benchmark tests on 'float' and 'double' data type operations using HotSpot JVM with and without JIT compilation. Topics include empty loop, assignment loop, add operation, multiplication operation and division operation.
2022-10-01, ∼398🔥, 0💬

Archived: Testing with LongWhile.java
This section provides a tutorial example on how to run LongWhile.java with JRockit 8.0 and compare it with HotSpot.
2022-10-01, ∼398🔥, 0💬

Usage Report on Heap Memory Areas
This section provides explanations of the usage report on heap memory areas generated by the '-Xlog:gc+heap=debug' log option.
2022-10-01, ∼397🔥, 0💬

Serial GC Tracing - Tenuring Threshold Controlled
This section provides a tutorial showing how to control Serial collector Tenuring threshold with InitialTenuringThreshold and MaxTenuringThreshold JVM options.
2022-10-01, ∼397🔥, 0💬

Archived: Testing with LongSleep.java
This section provides a tutorial example on how to run LongSleep.java with JRockit 8.0 and compare it with HotSpot.
2022-10-01, ∼396🔥, 0💬

emptyLoop() - The Empty Loop Test Method
This section provides a tutorial example on how to write empty loop test method. The benchmark test result shows impacts of JIT compilation and the garbage collection threads
2022-10-01, ∼395🔥, 0💬

Accessing the ClassLoader of a Class
This section provides a tutorial example on how to access the ClassLoader of a given class using the Class.getClassLoader() method.
2022-10-01, ∼390🔥, 0💬

Class Class - Class Reflections
This chapter provides tutorial notes and example codes on java.lang.Class class. Topics include Java class reflections and introspection; loading classes using Class.forName(); introspecting class members; array classes; method reflection.
2022-10-01, ∼390🔥, 0💬

Tenured Generation Collection - Major GC
This section describes basic steps of a Tenured Generation Collection, also called a Major GC, which uses a simple 3-step Mark-Sweep-Compact algorithm on the entire Tenured Generation.
2022-10-01, ∼389🔥, 0💬

Archived Tutorials
This chapter contains some outdated tutorial notes and example codes from previous versions of this book.
2022-10-01, ∼389🔥, 0💬

Running the Garbage Collector Explicitly
This section provides a tutorial example on how to run the Garbage Collector explicitly by calling the gc() method on the Runtime instance.
2022-10-01, ∼384🔥, 0💬

Thread Testing Program and Result
This chapter provides tutorial notes and example codes on thread testing. Topics include a thread testing program CrashThread2.java; maximum number of running threads tests on HotSpot 1.7, JRockit R28.2, HotSpot 1.6, JRockit 7, HotSpot 1.4.
2022-10-01, ∼383🔥, 0💬

Printing Runtime Basic Information
This section provides a tutorial example on how to access the Runtime instance of a running JVM and print some basic information.
2022-10-01, ∼380🔥, 0💬

JVM Architectures and Components
This section presents a JVM architecture and components shared by most JVM implementations.
2022-10-01, ∼378🔥, 0💬

"-XX:+NeverTenure" and "-XX:+AlwaysTenure" not Working
This section provides a tutorial showing '-XX:+NeverTenure' and '-XX:+AlwaysTenure' JVM options are not working with the Serial collector.
2022-10-01, ∼376🔥, 0💬

Running JRockit Mission Control
This section provides a tutorial example on how to run JRockit Mission Control 4.1 installed as part of JRockit R28.2.7.
2022-10-01, ∼375🔥, 0💬

Class Reflection and Introspection
This section provides a tutorial example on how to reflect a class as Class object and introspect its members: fields, methods, etc.
2022-10-01, ∼372🔥, 0💬

Performance Impact of Wait Time
This section provides tests to find out performance impact of the wait time between each chunk operations. Increasing wait time seems to decrease throughput performance.
2022-10-01, ∼372🔥, 0💬

Archived: StringBuffer Testing Program
This section describes a StringBuffer testing programs and test results showing that JDK 1.4.1 is slower than JDK 1.3.1.
2022-10-01, ∼367🔥, 0💬

GC Log Message Examples of Serial Collector
This section provides an example of GC log messages generated from the Serial Collector.
2022-10-01, ∼367🔥, 0💬

Adaptive Size Policy for Best Throughput
This section provides a tutorial on how Adaptive Size Policy is used by the Parallel collector to our best Throughput goal.
2022-10-01, ∼366🔥, 0💬

Performance Impact of Chunk Size
This section provides tests to find out performance impact of the chunk size (number of objects created and released in a single test run). The throughput performance seems to be not impacted by the chunk size, if some throughput jumps are ignored.
2022-10-01, ∼365🔥, 0💬

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