Practice path · 4 games

JVM Performance Diagnostics

Diagnose JVM runtime, memory, garbage collection, warmup, and capacity from bounded production evidence.

For Java engineers investigating performance without guess-driven tuning.

Java Advanced

Correlate thread dumps, safepoints, CPU, JFR, dependencies, and container evidence into bounded JVM hypotheses.

Java Advanced

Separate retained heap, allocation churn, metaspace, stacks, direct buffers, RSS, and container memory pressure.

Java Advanced

Read unified GC evidence and compare G1 and ZGC through controlled, reversible service experiments.

Java Advanced

Measure JIT compilation, code cache, warmup, AOT training, and capacity with explicit guardrails and rollback.