Question:
Which Garbage Collectors (GC) are available in a specific Azul Zulu Builds of OpenJDK release?
Answer:
You can see which Garbage Collectors are available (and the default GC) in a version of Azul Zulu by running the following command:
$ java -XX:+PrintFlagsFinal -version | grep "Use.*GC "You will see output similar to:
$ java -XX:+PrintFlagsFinal -version | grep "Use.*GC "
bool UseAdaptiveSizePolicyWithSystemGC = false {product}
bool UseConcMarkSweepGC = false {product}
bool UseG1GC = false {product}
bool UseMaximumCompactionOnSystemGC = true {product}
bool UseParNewGC = false {product}
bool UseParallelGC := true {product}
bool UseParallelOldGC = true {product}
bool UseSerialGC = false {product}
openjdk version "1.8.0_275"
OpenJDK Runtime Environment (Zulu 8.50.0.51-CA-linux64) (build 1.8.0_275-b01)
OpenJDK 64-Bit Server VM (Zulu 8.50.0.51-CA-linux64) (build 25.275-b01, mixed mode)Please note: You will need to parse the above output to separate out the GC algorithms from GC parameters. The algorithms are in Bold. The default (UseParallelGC in this case) has ":= true" value.
As with most OpenJDK vendors, Azul Zulu 8 has the following four GC options:
- G1
- Parallel*
- ConcMarkSweep (CMS)
- Serial
* In order to keep compatibility with OpenJDK, the default garbage collector for Azul Zulu 8 is Parallel GC.
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