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JIT and AOT Compilation in the JVM - Strengths and Weaknesses

Java via YouTube

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Overview

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This talk compares Java and JVM compilation approaches, including JIT profiling and speculation, AOT compilation, code caching, and external compilation services. It examines their performance benefits and tradeoffs across Java applications.

Syllabus

Intro
Native compilers in today's Java ecosystem
Life of a running Java application
1. Speculate on class hierarchy
2. JIT uses profile data collected as program runs
But JIT performance advantage isn't free
BUT there are a few big BUTS
Class loader objects can invalidate the inlining...
Contrived example?
Some AOT Fallacies
Profile Directed Feedback (PDF) may help
Two implementations
Open9 Shared Classes Cache
Strengths and Weaknesses
Wrapping up

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Java

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