This video describes the ‘Stone’ process in the GemStone Smalltalk system. The Stone allocates resources (object identifiers, free extent pages in the repository). The Stone manages the object lock requests. The Stone manages gem-to-gem communication. The Stone manages the commit process, including notifying gems that are interested in changed objects. The Stone supervises garbage collection, including the commit record backlog. The Stone manages checkpoints, the act of flushing all dirty pages from the shared page cache to the extents.