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Why is generation 2 garbage collection called full garbage collection?


Asked by Ledger Hull on Dec 04, 2021 FAQ



A generation 2 garbage collection is also known as a full garbage collection, because it reclaims objects in all generations (that is, all objects in the managed heap).
One may also ask,
Collecting a generation means collecting objects in that generation and all its younger generations. A Gen 2 garbage collection is also known as a full garbage collection because it reclaims all objects in all generations. A garbage collection has the following phases:
Just so, The Young Generation is further subdivided into an Eden space, where all new objects start, and two Survivor spaces, where objects are moved from Eden after surviving one garbage collection cycle. When objects are garbage collected from the Young Generation, it is a minor garbage collection event.
Subsequently,
All the newly allocated objects are also generation 0 objects implicitly unless they are large objects. In general, the frequency of garbage collection is the highest in generation 0. Generation 1 : If space occupied by some generation 0 objects that are not released in a garbage collection run, then these objects get moved to generation 1.
Thereof,
Objects that survive a generation 0 garbage collection are promoted to generation 1; objects that survive a generation 1 garbage collection are promoted to generation 2; and objects that survive a generation 2 garbage collection remain in generation 2.