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Heap Memory Area and Size Control
This chapter provides tutorial notes and example codes on heap memory area. Topics include OutOfMemoryError exception; Heap memory area allocation limits; OutOfMemoryError comparison of HotSpot and JRockit.
2022-10-01, ∼464🔥, 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, ∼464🔥, 0💬

"-XX:+PrintGC" - GC Logging Option for Short Messages
This section describes the garbage collection logging option, '-XX:+PrintGC', which prints a shot message after each garbage collection is done.
2022-10-01, ∼463🔥, 0💬

PSYoungGen Collector Using Tenuring Age
This section demonstrates that the PSYoungGen Collector uses Tenuring Age to perform Young generation GC. But it does not maintain the object age distribution list.
2022-10-01, ∼461🔥, 0💬

What Is java.lang.Class Class
This section describes what is java.lang.Class class - A built-in class that represent instances of all data types used in a Java application in the JVM.
2022-10-01, ∼458🔥, 0💬

Memory Management General Rules
This section describes some general rules used by JVM to manage memory.
2019-07-12, ∼457🔥, 2💬

💬 2019-07-12 divyansh: thanks

"-XX:+PrintGC" - Watching GC (Garbage Collection) Logs
This section provides a tutorial example on how to use the HotSpot JVM command option, -XX:+PrintGC, to watch GC (Garbage Collection) logs. JVM performs GC with a regular interval during the test run loop and has no impact on the execution time of the test code.
2022-10-01, ∼456🔥, 0💬

Archived: Installing JRockit JVM 8.0
This section provides a tutorial example on how to download and install JRockit 8.0 on Windows systems.
2022-10-01, ∼455🔥, 0💬

Implementations of JVM Specification
This section provides a list of major implementations of the JVM Specification.
2022-10-01, ∼454🔥, 0💬

What Is Eclipse OpenJ9
This section provides a quick introduction of Eclipse OpenJ9, which is an independent implementation of a JVM (Java Virtual Machine) developed by the Eclipse Foundation.
2022-10-01, ∼454🔥, 0💬

GCPerformance.java - GC Performance Test Program
This section describes a GC performance test program - GCPerformance.java.
2022-10-01, ∼451🔥, 0💬

Archived: GCTest.java - Garbage Collection Test Program
This section describes a garbage collection test program - GCTest.java.
2022-10-01, ∼450🔥, 0💬

BenchmarkRunner.java - Benchmark Runner Program
This section provides a tutorial example on how to write a benchmark runner program that takes care of JVM warming up, JIT compilation, measuring time, and other non-test related tasks.
2022-10-01, ∼448🔥, 0💬

Garbage Collection Demo Program
This section provides a tutorial example on watch how the garbage collection process works on HotSpot and other JVMs.
2022-10-01, ∼448🔥, 0💬

Garbage Collection Logging Options
This section describes HotSpot JVM options to generate garbage collection log messages. '-XX:+PrintGCDetails' and '-XX:+PrintGCDateStamps' are two most important options.
2025-12-31, ∼446🔥, 1💬

Serial GC Tracing - Tenuring Threshold
This section provides a tutorial showing how Serial GC changes the tenuring threshold dynamically and promotes objects to 'tenured' generation earlier or later to Tenuring generation to meet the TargetSurvivorRatio setting.
2022-10-01, ∼446🔥, 0💬

Concurrent Mark-Sweep Collector GC Log Message Format
This section describes the log message format of HotSpot JVM Concurrent Mark-Sweep (CMS) Collector.
2022-10-01, ∼446🔥, 0💬

"-XX:+PrintReferenceGC" - Reference Counts per GC
This section describes the garbage collection logging option, '-XX:+PrintReferenceGC', which prints object reference counts.
2022-10-01, ∼443🔥, 0💬

Adaptive Size Policy Log Messages
This section provides examples and explanations of log messages generated '-XX:AdaptiveSizePolicyOutputI nterval=1'and 'PrintAdaptiveSizePolicy' JVM options used with the Parallel collector.
2022-10-01, ∼443🔥, 0💬

Archived: Running JRockit JVM with Management Console
This section provides a tutorial example on use JRockit Management Console server and client components to collect runtime data from the JRockit JVM.
2022-10-01, ∼439🔥, 0💬

Micro Benchmark Tests on "long" Operations
This chapter provides tutorial notes and example codes on micro benchmark tests on 'long' data type operations. Topics include empty loop, assignment loop, add operation, multiplication operation and division operation.
2022-10-01, ∼438🔥, 0💬

Serial GC Tracing - Tight Heap
This section provides a tutorial on tracing how Serial GC works with a tight heap size.
2022-10-01, ∼438🔥, 0💬

java.lang.System Class - The Operating System
This chapter provides tutorial notes and example codes on java.lang.System class. Topics include accessing standard input, output, and error streams; getting the current time in milliseconds and nanoseconds; accessing environment variables; managing JVM instance properties.
2022-10-01, ∼437🔥, 0💬

Object References and Garbage Collection
This chapter provides tutorial notes and example codes on Object References and Garbage Collection. Topics include object reference types; strong reference test program; final reference test program; dead objects with final references in heap; performance impact of final references.
2022-10-01, ∼437🔥, 0💬

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