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fantasticmao/GC Options Notes.md

Last active November 29, 2018 16:35
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Factors Affecting Garbage Collection Performance
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GC Options Notes.md

https://docs.oracle.com/javase/10/gctuning/factors-affecting-garbage-collection-performance.htm

  • -Xms<minimum>: min heap size
  • -Xmx<max>: max heap size
  • -XX:MinHeapFreeRatio=<min>: min (free space)/(live objects)
  • -XX:MaxHeapFreeRatio=<max>: max (free space)/(live objects)
  • -XX:NewRatio=<number>: (young generation)/(old generation)
  • -XX:NewSize=<min>: min young generation size
  • -XX:MaxNewSize=<max>: max young generation size
  • -XX:SurvivorRatio=<number>: (eden space)/(survivor space)

https://docs.oracle.com/javase/10/gctuning/parallel-collector1.htm

  • -XX:+UseParallelGC: use Parallel Collector
  • -XX:ParallelGCThreads=<N>: number of garbage collector threads
  • -XX:MaxGCPauseMillis=<N>: max GC pause time (milliseconds)
  • -XX:GCTimeRatio=<N>: (garbage collection time)/(application time)=1/(1+N)
  • -XX:YoungGenerationSizeIncrement=<Y>: percentage for the young generation growing
  • -XX:TenuredGenerationSizeIncrement=<T>: percentage for the old generation growing
  • -XX:AdaptiveSizeDecrementScaleFactor=<D>: percentage for generation shrinks
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