What is the JVM’s Just-In-Time (JIT) compiler and what optimization does tiered compilation provide?

Java Professional Hard

Java Professional — Hard

What is the JVM’s Just-In-Time (JIT) compiler and what optimization does tiered compilation provide?

Key points

  • JIT compiles bytecode to native machine code at runtime
  • Tiered compilation uses a fast C1 compiler for quick startup and an optimizing C2 compiler for hot code
  • Tiered compilation provides performance optimization
  • JIT does not compile Java source to bytecode

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