The minor collection output format

The minor collection output for these options produce output of the form

[GC [<collector>: <starting occupancy1> -> <ending occupancy1>, <pause time1> secs ] <starting occupancy3> -> <ending occupancy3>, <pause time3> secs ]

where
<collector> is an internal name for the collector used in the minor collection
<starting occupancy1> is the occupancy of the young generation before the collection
<ending occupancy1> is the occupancy of the young generation after the collection
<pause time1> is the pause time in seconds for the minor collection.
<starting occupancy3> is the occupancy of the entire heap before the collection
<ending occupancy3> is the occupancy of the entire heap after the collection
<pause time3> is the pause time for the entire garbage collection. This would include the time for a major collection is one was done.