After discarding UseSerialGC, there are three concrete groups of collection strategies one could choose:

  • UseParallelGC: for high throughput
  • UseConcMarkSweepGC: for low latency, has been proposed to be replaced by g1gc
  • UseG1GC: for low latency

The last one maintains logical generations, so there are no separate policy for young/old generation.

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#!/usr/bin/zsh -e

# GC="-XX:+UseSerialGC"

# GC="-XX:+UseParallelGC"
# GC="-XX:+UseParallelOldGC"

# GC="-XX:+UseParNewGC"
# GC="-XX:+UseConcMarkSweepGC"

# GC="-XX:+UseG1GC"

java \
    $GC \
    -XX:+PrintCommandLineFlags -version &> 1 | \
    head -n 1 | \
    tr ' ' '\n'

ยงReferences