Reference counting
- Like Birrel's DGC, but concrete objects keep a counter of the remote
processes referencing that object.
- Dirty calls increments the counter and clean calls decrement it.
- When the counter reaches zero, the object can be recycled (if not
referenced locally).
- Generates lot of packet traffic on the network.
- Not fault tolerant: if a process dies, the object will never
be collected.
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