Of the three approaches outlined in this chapter, crossbeam-epoch is the fastest, both in terms of our measurements and from discussions in the literature. The faster technique, quiescent-state-based memory reclamation, is not discussed in this chapter as it's an awkward fit for user-space programs and there is no readily-available implementation in Rust. Furthermore, the authors of the library have put years of work into the implementation: it is well-documented and runs on modern Rust across multiple CPU architectures.
Traditional issues with the approach—namely, threads introducing long delays to pinned critical sections, resulting in long-lived epochs and garbage buildup—are addressed in the API by the abiltiy of Guard to be ...
