Master JVM Garbage Collection: Essential Parameters for Optimal Performance
This guide compiles all JVM garbage‑collection parameters—standard, non‑standard, and experimental—explaining their meanings and how to configure them to minimize pause times, improve performance, and tailor GC behavior for different application types and hardware environments.
Whether it’s Minor GC (YGC) or Full GC (Major GC), garbage collection can pause Java programs; selecting appropriate GC strategies and tuning JVM/GC parameters can greatly reduce these pauses and improve efficiency.
Parameter Types
Standard Parameters
Standard parameters are prefixed with a single hyphen (-) and are generally consistent across JVM versions.
-version -verbose:gcNon‑standard Parameters
Non‑standard parameters start with -X; they are not guaranteed to remain stable.
-Xms2g -Xmx2gUnstable (Experimental) Parameters
Unstable parameters begin with -XX and may change at any time; refer to official documentation for details.
Functional switches:
Performance parameters:
Debug parameters:
Example of common experimental options:
-XX:+UseG1GC -XX:+PrintGCDetails -XX:G1HeapRegionSize=16m -XX:G1ReservePercent=25 -XX:InitiatingHeapOccupancyPercent=30 -XX:+AlwaysPreTouch -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=30m -Xloggc:d:/jvm_gc_%p.logSigned-in readers can open the original source through BestHub's protected redirect.
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