ParNew

vivo Internet Technology

Oct 27, 2021 · Backend Development

JVM Garbage Collection Tuning for a Video Service to Reduce P99 Latency

By replacing the default Parallel GC with a ParNew‑CMS collector, enlarging the Young generation, fixing Metaspace settings, and tuning CMS occupancy thresholds, the video service cut Young and Full GC pauses dramatically, lowered Full GC count by over 80%, and achieved more than 30% P99 latency reduction, with some APIs improving up to 80%.