ZGC is a new garbage collector recently open-sourced by Oracle for the OpenJDK. It was mainly written by Per Liden. ZGC is similar to Shenandoah or Azul’s C4 that focus on reducing pause-times while still compacting the heap. Although I won’t give a full introduction here, “compacting the heap” just means moving the still-alive objects to the start (or some other region) of the heap. This helps to reduce fragmentation but usually this also means that the whole application (that includ...
