Concurrent programs executing on NUMA architectures consist of concurrent
entities (e.g. threads, actors) and data placed on different nodes. Execution
of these concurrent entities often reads or updates states from remote nodes.
The performance of such systems depends on the extent to which the concurrent
entities can be executing in parallel, and on the amount of the remote reads
and writes.
We consider an actor-based object oriented language, and propose a type
system which expresses the topology of the program (the placement of the actors
and data on the nodes), and an effect system which characterises remote reads
and writes (in terms of which node reads/writes from which other nodes). We use
a variant of ownership types for the topology, and a combination of behavioural
and ownership types for the effect system.Comment: In Proceedings PLACES 2015, arXiv:1602.0325