what is tomcat default GC option?

Question

in catalina.sh I set JAVA_OPTS like this.

JAVA_OPTS="-server -Xms2048m -Xmx2048m"

in this case what is default GC option?

I think default option is serial GC.(-XX:+UseSerialGC)

thanks.

Answer 1

This article says:

On server-class machines running the server VM, the garbage collector (GC) has changed from the previous serial collector (-XX:+UseSerialGC) to a parallel collector (-XX:+UseParallelGC). You can override this default by using the -XX:+UseSerialGC command-line option to the java command.

As you are forcing the server VM using -server, this also applies to you.

You can always double check this with JConsole through JMX.

Answer 2

Unless Tomcat sets something different it's the same as the default for the JVM.