As Appel et al.describe,this algorithm can be used with standard tech-niques for improving copying collectors,such as separating generations of objects(9,12),and providing a separate space for allocating new objects(12).The changes described in this paper do not require objects to have any though its efficiency and real-time latency will depend on the mschine architecture,the run-time system of the mutator,and the operating system.It shows promise on today's high-end machines for applications for applications that can tolerate millisecond delays.