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"-XX:+PrintGCApplicationConcurrentTime" - Application Running Durations
This section describes the garbage collection logging option, '-XX:+PrintGCApplicationConcur rentTime',which prints how much time it lasted when the JVM pauses the execution of the application for garbage collection or other JVM event.
2022-10-01, 182🔥, 0💬

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, 182🔥, 0💬

Archived: 640/400/40MB Test on HotSpot Client 1.7
This section provides a tutorial example on running GCTest2.java on HotSpot Client JVM 1.7.0_45 with 640MB memory limit and a 400MB base plus 40MB fluctuating memory usage with object size of 1.25MB.
2022-10-01, 182🔥, 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, 181🔥, 0💬

Performance Tests on Parallel collector
This chapter provides tutorial notes and example codes on performance impact of Parallel collector, Topics include heap footprint; heap size impact; running Young GC only, running more Old GC.
2022-10-01, 181🔥, 0💬

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, 181🔥, 0💬

Tenured Generation Collectors - Serial, ParOldGen, CMS, G1
This section describes Garbage Collectors used for the Tenured generation: Serial, Parallel Old (ParOldGen), Concurrent Mark Sweep (CMS), and Garbage First (G1).
2022-10-01, 181🔥, 0💬

What Is JRockit Mission Control?
This section describes JRockit Mission Control, which is a set of JVM monitoring and management tools including Management Console, Runtime Analyzer and Memory Leak Detector.
2022-10-01, 180🔥, 0💬

Archived: Installing JRockit JVM 7.0
This section provides a tutorial example on how to download and install JRockit 7.0 on Windows systems.
2022-10-01, 178🔥, 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, 177🔥, 0💬

Performance Tests on Serial Collector
This chapter provides tutorial notes and example codes on performance impact of Serial collector, Topics include heap footprint; GC logging impact; wait time impact; heap size impact; running minor GC only, running more major GC.
2022-10-01, 177🔥, 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, 176🔥, 0💬

OutOfMemoryError Comparison of HotSpot and JRockit
This section provides a tutorial example to compare the OutOfMemoryError exception between HotSpot 12, 10, 1.8, 1.7, 1.6 and JRockit 28.2.7.
2022-10-01, 176🔥, 0💬

GCPerformance.java - GC Performance Test Program
This section describes a GC performance test program - GCPerformance.java.
2022-10-01, 176🔥, 0💬

ClassChecker.java - Reports Class Loader
This section provides a tutorial example, ClassChecker.java, which reports the class loader by the JVM to load a given class.
2022-10-01, 175🔥, 0💬

Performance Jumps Not Related to GC
This section provides a tutorial showing that Performance jumps are not related garbage collections.
2022-10-01, 175🔥, 0💬

OutOfMemoryError Comparison of HotSpot and JRockit
This section provides a tutorial example to compare the OutOfMemoryError exception between HotSpot 1.8, 1.7, 1.6 and JRockit 28.2.7.
2022-10-01, 175🔥, 0💬

ParNew Collector - Tenuring Age Distribution
This section demonstrates that the ParNew Collector uses Tenuring Age Distribution to perform Young generation GC.
2022-10-01, 174🔥, 0💬

Performance Tests on Concurrent collector
This chapter provides tutorial notes and example codes on performance impact of Concurrent collector, Topics include heap footprint; heap size impact; running Young GC only; running more Old GC; impact of parallel threads; impact of concurrent threads.
2022-10-01, 171🔥, 0💬

Serial GC Tracing - Tight Heap (Part 2)
This section provides part 2 of a tutorial on tracing how Serial GC works with a tight heap size.
2022-10-01, 171🔥, 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, 170🔥, 0💬

Java Exception: "java.lang.OutOfMemoryError: Java heap space"
This section provides a tutorial example on how JVM expands the Heap space to allocate more objects and leads to the 'java.lang.OutOfMemoryError: Java heap space' Java exception, if it is not allowed to expand any more.
2022-10-01, 170🔥, 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, 170🔥, 0💬

Collector Combinations: Serial, Parallel, Concurrent, G1
This section describes different garbage collector combinations supported by Java 8 HotSpot: Serial, Parallel, Concurrent, and G1.
2022-10-01, 169🔥, 0💬

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