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Java Captain

Nov 8, 2023 · Fundamentals

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.

CodeCacheJVMJava

0 likes · 10 min read

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

0 likes · 15 min read

JVM JIT and CodeCache Parameter Configuration Guide