How is the internal implementation of Crossbeam designed, and in what ways does it improve upon the use of standard threads in Rust?
Answering this would probably require a very long reply. Have you seen their learning materials, including the videos?:
https://github.com/crossbeam-rs/rfcs/wiki
The "Epoch-based memory reclamation" is described here:
https://docs.rs/crossbeam/latest/crossbeam/epoch/index.html
Crossbeam doesn't replace threads. It replaces some constructs for communication and synchronization between the standard OS threads.
In old versions of Rust, implementation of mpsc channels wasn't great, and crossbeam's channels were much faster. Currently std::mpsc uses crossbeam itself, so it's about the same thing, just under an older API.
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