Oracle 对 jvm 参数的说明文档
λ java -version java version "1.8.0_162" Java(TM) SE Runtime Environment (build 1.8.0_162-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.162-b12, mixed mode)
λ java -XX:+PrintFlagsInitial
λ java -XX:+PrintFlagsFinal 2> nul
λ java -XX:+PrintCommandLineFlags 2> nul -XX:InitialHeapSize=266579392 -XX:MaxHeapSize=4265270272 -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:-UseLargePagesIndividualAllocation -XX:+UseParallelGC
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