Understanding Java OOM Errors: Heap, GC Overhead, Metaspace, CodeCache, Direct Memory, and Linux OOM Killer

This article explains the various Java OutOfMemoryError types—including Java heap space, GC overhead limit exceeded, Metaspace, CodeCache, Direct Memory, and Linux OOM Killer—describes their causes, typical symptoms, and provides step‑by‑step troubleshooting and mitigation strategies for developers.

CodeCacheJVMMemory Management

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Understanding Java OOM Errors: Heap, GC Overhead, Metaspace, CodeCache, Direct Memory, and Linux OOM Killer

Sohu Tech Products

Aug 24, 2022 · Fundamentals

JVM JIT and CodeCache Parameter Configuration Guide

This article explains the JVM's Just‑In‑Time compilation mechanism and CodeCache memory area, detailing the purpose and default values of key JIT parameters such as TieredCompilation, CompileThreshold, OnStackReplacePercentage, CICompilerCount, as well as CodeCache settings like InitialCodeCacheSize, ReservedCodeCacheSize, Xmaxjitcodesize, CodeCacheMinimumFreeSpace and UseCodeCacheFlushing, and provides practical tuning advice for high‑traffic Java services.

CodeCacheHotSpotJIT

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JVM JIT and CodeCache Parameter Configuration Guide

Huawei Cloud Developer Alliance

Dec 20, 2019 · Backend Development

Why Java and Python Behave Differently on Armv8 and How to Optimize JVM Performance

This article compares Java and Python on Armv8 platforms, explaining why both compile to machine code and rely on virtual machines, detailing JVM feature support across architectures, and offering configuration tips to prevent CodeCache overflow and improve performance, while also noting Python's compatibility on Kunpeng servers.

CodeCacheJVMKunpeng

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Why Java and Python Behave Differently on Armv8 and How to Optimize JVM Performance