jdk11默认使用的垃圾回收器是G1
zxl ~ java -version
openjdk version “11.0.5” 2019-10-15
OpenJDK Runtime Environment (build 11.0.5+10-post-Ubuntu-0ubuntu1.118.04)
OpenJDK 64-Bit Server VM (build 11.0.5+10-post-Ubuntu-0ubuntu1.118.04, mixed mode, sharing)
zxl ~ java -XX:+PrintCommandLineFlags
-XX:G1ConcRefinementThreads=2 -XX:GCDrainStackTargetSize=64 -XX:InitialHeapSize=49017280 -XX:MaxHeapSize=784276480 -XX:+PrintCommandLineFlags -XX:ReservedCodeCacheSize=251658240 -XX:+SegmentedCodeCache -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseG1GC
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