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The Sapphire fully concurrent (on-the-fly) replicating garbage collector
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TRANSACTIONAL SAPPHIRE Tomoharu Ugawa, Kochi University of Technology, Japan Carl Ritson, University of Kent, UK Richard Jones, University of Kent, UK This is an implementation of the Sapphire GC algorithm [1,2]. It is the first on-the-fly, parallel, replication copying, garbage collector for the Jikes RVM Java virtual machine. The implementation provides innovations such as copying with hardware or software transactions, on-the-fly management of Java's reference types and simple, yet correct, lock-free management of volatile fields in a replicating collector. The jikesrvm directory provides the source code for the Jikes RVM including the Sapphire GC. The models directory above provides SPIN models  of critical components of this complicated and highly concurrent system.  Richard L. Hudson and J. Eliot B. Moss. 2003. Sapphire: Copying Garbage Collection Without Stopping the World. Concurrency and Computation: Practice and Experience 15, 3–5 (2003), 223–261. https://doi.org/10.1002/cpe.712  Transactional Sapphire: Lessons in High Performance, On-the-fly Garbage Collection. Tomoharu Ugawa, Carl Ritson and Richard Jones [in submission]  G. J. Holzmann. 2004. The SPIN Model Checker: Primer and Reference Manual. Addison-Wesley.