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Log Message Types from Serial Collector
This section describes various types of log messages generated from the Serial Collector with the '-Xlog:gc*=debug' option.
2022-10-01, 189🔥, 0💬

Adaptive Size Policy Changed Eden Space
This section provides a tutorial on how Adaptive Size Policy used by the Parallel collector changed the eden space in the Young generation to meet the throughput goal.
2022-10-01, 189🔥, 0💬

GCPerfP99.java - Output Verification
This section provides tutorials to verify output from GCPerfP99.java test runs. System interrupts are successfully excluded from performance calculation.
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Performance Impact of Object Size
This section provides tests to find out performance impact of the object size. Java manages larger objects more efficiently for the same total amount of data.
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Young Generation Collectors - Serial, PS, ParNew, G1
This section describes Garbage Collectors used for the Young generation: Serial, Parallel Scavenge (PS), Parallel New (ParNew), and Garbage First (G1).
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Adaptive Size Policy for Best Latency
This section provides a tutorial on how Adaptive Size Policy is used by the Parallel collector to our best latency goal.
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Archived: 640/400/40MB Test on HotSpot Client 1.6
This section provides a tutorial example on running GCTest2.java on HotSpot Client JVM 1.6.0_45 with 640MB memory limit and a 400MB base plus 40MB fluctuating memory usage with object size of 1.25MB.
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Serial Collector Stops Application for Minor/Major GC
This section provides log messages showing that the Serial Collector stops the application for both Minor GC and Major GC.
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References
List of reference materials used in this book.
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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.
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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.
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Adaptive Size Policy Changed Survivor Space
This section provides a tutorial on how Adaptive Size Policy used by the Parallel collector changed the survivor space in the Young generation.
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JVM Memory Manager - Garbage Collector
This section describes what is a garbage collector and its role and responsibilities for managing the JVM memory.
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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.
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OpenJ9 by Eclipse Foundation
This chapter provides tutorial notes and example codes on OpenJ9 JVM. Topics include downloading and installing OpenJ9; running Java programs on OpenJ9 JVM; memory footprint of OpenJ9 JVM; comparison of startup time and footprint between OpenJ9 and HotSpot.
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Performance Test and System Interruptions
This section provides a tutorial showing performance measurement impact of operating system interruptions on JVM.
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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.
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Memory Allocation Limits on Windows Systems
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.
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Serial Collector Stops Application for Minor/Major GC
This section provides log messages showing that the Serial Collector stops the application for both Minor GC and Major GC.
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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.
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GCPerfP99.java - 99th Percentile Performance
This section provides a GC test program, GCPerfP99.java, that uses 99th percentile performance measurements.
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About This Book
This section provides some detailed information about this book - __title__.
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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.
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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💬

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