Performance Tests on Serial Collector

Java GC Tutorials - Herong's Tutorial Examples

∟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 Young GC only, running more Old GC.

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Serial GC Footprint - Free Heap 4%

GC Logging Impact on Serial GC

Heap Size Impact on Serial GC

Serial GC on 400MB Heap

Serial GC on 800MB Heap

Serial GC on 1600MB Heap

Performance of Serial Young GC

Object Size Impact on Serial Young GC

Chunk Size Impact on Serial Young GC

Performance of Serial Full GC

Serial Full GC on 1600MB Tenured Space

Object Size Impact on Serial Old GC

Performance Summary of Serial Collector

Takeaways:

The Serial collector requires about 4% free heap space to perform garbage collections.
GC logging has little impact on application performance.
More free heap space will increase application performance.
Serial Young GC and Old GC provide about the same application performance.
Serial Young GC and Old GC provide about the same application throughput performance.
Serial Young GC and Old GC provide about the same performance regardless of object size.
With certain Young and Tenuring configuration, like 800 MB heap and default NewRatio/Survivor ratios, Serial Minor GC fails to remove dead objects, and copies them to Tenured generation. Those failed GCs uses much long times, impacting heavily on latency.

Table of Contents

About This Book

Heap Memory Area and Size Control

JVM Garbage Collection Logging

Introduction of Garbage Collectors

Serial Collector - "+XX:+UseSerialGC"

Parallel Collector - "+XX:+UseParallelGC"

Concurrent Mark-Sweep (CMS) Collector - "+XX:+UseConcMarkSweepGC"

Garbage First (G1) Collector - "+XX:+UseG1GC"

The Z Garbage Collector (ZGC) - "+XX:+UseZGC"

Object References and Garbage Collection

Garbage Collection Performance Test Program

►Performance Tests on Serial Collector

Performance Tests on Parallel collector

Performance Tests on Concurrent collector

Performance Tests on G1 collector

Garbage Collection Performance Test Summary

References

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