Java Is Slowing Down: CodeCache Edition
summary
Covers diagnosing unexpected Java slowdowns caused by JIT/CodeCache behavior, including cases where one cluster node becomes slower after innocuous changes or restarts. Describes tools and techniques to control and analyze the JIT compiler—collecting core dumps, investigating CodeCache/JIT activity and making fixes such as patches to OpenJDK.
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chapters (9)
- 0:00Introduction
- 3:11CodeCache problem
- 8:13CodeCache overflow causes
- 12:50CodeCache size tuning
- 18:28CodeCache diagnostics tools
- 27:12Poisoning CodeCache with code
- 36:10JIT compilation and OSR
- 40:45Core dump analysis
- 54:50Summary and recommendations
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