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The Garbage Collection tab displays one table for each garbage collection that is currently running. The title of the table represents a garbage collector. For example, the titles such as PS MarkSweep and PS Scavenge represent the respective garbage collectors.
By default, each table contains the following information:
Total Collection Time: Total time for all garbage collections of the same type of garbage collector
Collection Count: Total number of collections of the same type of garbage collector
GC Start Time: Start time of the last garbage collection; measured since the JVM startup
GC End Time: End time of the last garbage collection; measured since the JVM startup
GC Duration: Total duration of the last garbage collection
GC ID: ID of the last garbage collection.
GC Thread Count: The number of threads participated in the last garbage collection.
You can add or remove the garbage collector attributes by using the Add and Remove buttons on the right pane.
Click the Trash icon on the top right corner of the Garbage Collector tab to perform a full garbage collection.