JVM and Memory Tuning

JVM tuning for Minecraft hosting centers on predictable garbage collection behavior and controlled heap sizing. Over-allocating memory can increase pause recovery times, while under-allocating memory increases allocation churn and full-collection risk. The objective is stable memory pressure with consistent tick delivery under sustained activity.

Modern deployments generally favor G1GC for balanced pause behavior, with flag tuning adjusted for heap size and plugin profile. Operators should treat JVM flags as workload-specific parameters rather than universal templates. Metrics such as GC pause duration, allocation rate, and old-generation occupancy are more reliable than anecdotal flag sets.

RAM allocation should reserve headroom for native memory, filesystem cache, and host-level processes. Assigning all available RAM to a single server instance often degrades total platform reliability. On multi-instance nodes, balanced allocation with explicit per-instance limits supports better VPS orchestration and prevents noisy-neighbor effects.

CPU bottlenecks are frequently correlated with garbage collection pressure and synchronous plugin execution. For this reason, JVM changes should be reviewed alongside plugin profiling and thread scheduling behavior described in Tick Stability & Anti-Lag.