In Seven Concurrency Models in Seven Weeks by Butcher, it compares Actor Model and Communicating Sequential Processes (CSP):
CSP is more flexible than actor model: In actor model, the medium of communication is tightly coupled to the unit of execution: each actor has precisely one mailbox; In CSP, channels are first class and can be independently created, written to, read from, and passed between tasks.
Nothing stops CSP from supporting distribution and fault tolerance, but historically CSP has not had the same level of focus and support of the two as actor model does.
Both actor model and CSP do not directly support parallelism. Parallelism has to be created based on concurrency building blocks.
I was wondering if the two concurrency models can be compared in terms of some metrics (some measurement, quantities, ...) in aspects either mentioned above or not. (Butcher's book doesn't mention such metrics. I also tried but haven't found it in Varela's Programming Distributed Computing Systems.)
If concurrency models can not be compared in metrics, how can they be compared?
I am looking for some metrics to fit into the comparison between the concurrency models. Also for books, papers and articles for comparing them.