CodeOnCode

Jul 6, 2026 · Backend Development

Big‑Sale Load Test: Why You Shouldn't Rush to Tune JVM Parameters

During a major sales promotion, a sudden P99 latency jump can tempt teams to tweak JVM settings, but this article shows how to build a three‑layer evidence chain—GC logs, JFR, business and container metrics—to confirm whether the JVM is truly at fault before making any parameter changes.