Concurrent mark sweep collector
The Concurrent mark sweep collector is a mark-sweep garbage collector in the Oracle HotSpot Java virtual machine available since version 1.4.1.The HotSpot JVM selects the default garbage collector based on several factors. The newer Garbage-first collector is planned to replace CMS.
To launch the JVM with this garbage collector you can add this property to the java command line -XX:+UseConcMarkSweepGC