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This article introduces the knowledge of "how to view the default garbage collector used by JVM". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

View the default garbage collector view steps used by JVM

Cmd executes the command:

Java-XX:+PrintCommandLineFlags-version

The output is as follows (for example):

For the above-XX:UseParallelGC, here we refer to the introduction of "in-depth understanding of the Java virtual machine: advanced features and best practices of JVM":

In other words, turn on this switch, and the garbage collector used is: Parallel Scavenge, Ps MarkSweep combination.

Jvm default garbage collector 789

Jdk1.7 default garbage collector Parallel Scavenge (new generation) + Parallel Old (old age)

Jdk1.8 default garbage collector Parallel Scavenge (new generation) + Parallel Old (old age)

Jdk1.9 default garbage collector G1

The-XX:+PrintCommandLineFlagsjvm parameter can view the default setting collector type

-XX:+PrintGCDetails can also be judged by the names of the new and old generations of the printed GC logs.

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