Java 기본 Garbage Collector 확인

1. Java 기본 GC 확인

1) 명령어

java -XX:+PrintCommandLineFlags -version

2) Java 1.8

-XX:+UseParallelGC로 출력 된다. Java 1.8의 기본 GC는 ParallelGC이다.

-XX:InitialHeapSize=534731584 -XX:MaxHeapSize=8555705344 -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:-UseLargePagesIndividualAllocation -XX:+UseParallelGC
java version "1.8.0_251"
Java(TM) SE Runtime Environment (build 1.8.0_251-b08)
Java HotSpot(TM) 64-Bit Server VM (build 25.251-b08, mixed mode)

3) Java 11

-XX:+UseG1GC로 출력 된다. Java 11의 기본 GC는 G1GC이다.

-XX:G1ConcRefinementThreads=4 -XX:GCDrainStackTargetSize=64 -XX:InitialHeapSize=134217728 -XX:MaxHeapSize=2147483648 -XX:+PrintCommandLineFlags -XX:ReservedCodeCacheSize=251658240 -XX:+SegmentedCodeCache -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseG1GC
openjdk version "11.0.3" 2019-04-16 LTS
OpenJDK Runtime Environment Zulu11.31+11-CA (build 11.0.3+7-LTS)
OpenJDK 64-Bit Server VM Zulu11.31+11-CA (build 11.0.3+7-LTS, mixed mode)

[출처 및 참고]

• https://velog.io/@miz/Java-Default-GC811