Java / GraalVM Interview questions

What is the purpose of the Graal compiler's tiered execution?

Tiered compilation is a strategy where code starts out running in a cheap mode and only gets progressively more expensive optimization applied once it's proven to be worth it, balancing startup latency against peak throughput.

Tier	Behavior
Interpreter / C1-like	Fast to produce, collects execution profile data
Graal (limited)	Applies some optimizations once a method is warm
Graal (full/top tier)	Full optimization - aggressive inlining, escape analysis, speculative optimizations - once a method is hot

By only spending the Graal compiler's heavier analysis on methods that actually run often, tiered execution avoids wasting compilation time on code paths that execute once, while still giving hot loops the best possible machine code over time.

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The main goal of tiered compilation is to: Balance fast startup against peak throughput by only fully optimizing hot code

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Guarantee every method is compiled at maximum optimization immediately

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Avoid compiling any code and rely purely on interpretation

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Replace garbage collection with a compiler pass

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Which methods receive the Graal compiler's most aggressive optimizations? Methods proven to be hot through profiling data

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Every method, regardless of call frequency

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Only methods called exactly once

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Only static initializers

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Java / GraalVM Interview questions

What is the purpose of the Graal compiler's tiered execution?

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