advanced~4h
Garbage Collection Tuning
Moving from knowing what the collectors do to actually tuning one for a real workload: the G1 flags that matter in practice, when a pause-time goal justifies reaching for ZGC instead, how to read a GC log without guessing, and a worked scenario that diagnoses a GC problem from its symptoms rather than from theory alone.
Learning objectives
- Tune G1's most impactful flags for a real workload, understanding what each one actually trades off
- Decide, for a given set of symptoms, whether G1 tuning is enough or ZGC is genuinely warranted
- Read a GC log and extract pause type, pause duration, and heap occupancy before and after
- Diagnose a GC-related production symptom (long pauses, frequent full GCs, high allocation rate) by working backward from observed behavior
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Garbage Collection Tuning