-XX:ConcGCThreads

This Oracle HotSpot option affects the number of threads used by the concurrent garbage collector. This option is recognized by OpenJ9 and provided for compatibility.

Syntax

    -XX:ConcGCThreads=<number>

Where <number> is the number of low-priority background threads that are attached to assist the mutator threads in concurrent mark.

Within OpenJ9 this option is directly mapped to -Xconcurrentbackground.