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"-XX:+PrintGCTaskTimeStamps" - Print GC Threads
This section describes how to use the '-XX:+PrintGCTaskTimeStamps' JVM option to show multiple GC threads used by the Parallel Collector.
2022-10-01, ∼325🔥, 0💬

Archived: Download and Install Java SE 1.6 Update 2
This chapter provides a tutorial example on how to download and install Java SE 1.6 Update 2 (JDK 6u2) on Windows systems.
2022-10-01, ∼322🔥, 0💬

Archived: GCTest2.java - Garbage Collection Test Program
This section describes a garbage collection test program - GCTest2.java.
2022-10-01, ∼322🔥, 0💬

What Is Serial Collector
This section describes the Serial Collector, which uses the combination of the Serial Collector of Young generation and the Serial Collector of Tenured generation, so both minor GC and major GC are performed in a single thread serially in a stop-the-world fashion.
2022-10-01, ∼321🔥, 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, ∼319🔥, 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, ∼319🔥, 0💬

Archived: GC Test - Releasing Old vs. New Objects
This section provides a tutorial example on testing garbage collection by comparing performances between release old objects and new objects.
2022-10-01, ∼317🔥, 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, ∼315🔥, 0💬

Serial GC Tracing - Tight Heap (Part 3)
This section provides part 3 of a tutorial on tracing how Serial GC works with a tight heap size.
2022-10-01, ∼315🔥, 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, ∼314🔥, 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, ∼313🔥, 0💬

Serial GC Tracing - Aged Live Objects
This section provides a tutorial of tracing how Serial GC increases the age of objects survived each additional GC in 'from' space.
2022-10-01, ∼312🔥, 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, ∼312🔥, 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, ∼311🔥, 0💬

HotSpot Memory Usages on Windows Systems
This section provides a tutorial example on how to check HotSpot memory usages on Windows systems using the Runtime class.
2022-10-01, ∼311🔥, 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, ∼310🔥, 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, ∼307🔥, 0💬

What Is java.lang.ClassLoader Class
This section describes what is java.lang.ClassLoader class - A built-in abstract class that represents ClassLoaders used in JRE to load dynamically Java classes into the JVM.
2022-10-01, ∼306🔥, 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, ∼306🔥, 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, ∼305🔥, 0💬

"START /REALTIME" - Run JVM with Highest Priority
This section provides a tutorial showing how to use 'START /REALTIME' command to run JVM with highest priority on Windows systems.
2022-10-01, ∼304🔥, 0💬

Garbage Collection Performance Test Summary
This chapter provides discussions on GC performance test result. Topics include comparison of performances of different garbage collectors; suggestions to use garbage collectors more efficiently.
2022-10-01, ∼303🔥, 0💬

Parallel Collector Changing NewRatio and SurvivorRatio
This section demonstrates that the Parallel Collector changes the NewRatio and the SurvivorRatio dynamically, even they are specified in command line.
2022-10-01, ∼301🔥, 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, ∼300🔥, 0💬

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