advanced~3h
JVM Performance Interview Deep Dive
A capstone topic tying the JVM Performance category together through the lens of the questions that actually get asked in interviews: why an app feels slow for its first few seconds, how to investigate a production memory leak, the real difference between a minor and a major GC, what -Xmx actually controls, and when a senior engineer would genuinely reach for G1 over ZGC.
Learning objectives
- Explain JIT warmup clearly enough to answer 'why is my app slower for the first few seconds' with real mechanism, not a slogan
- Describe a concrete, tool-by-tool investigation plan for a suspected production memory leak
- Distinguish a minor (young-generation) GC from a major/full GC in terms of what each actually collects and why they cost differently
- State precisely what -Xmx controls and what it does not control
- Justify choosing G1 over ZGC (or vice versa) using real latency and throughput reasoning rather than a memorized rule
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JVM Performance Interview Deep Dive