Hands-On Concurrency with Rust

Embedding C into Rust – feruscore without processes

When we wrapped up our discussion of feruscore in the previous chapter, we'd constructed a program that could discover corewars warriors through simulated natural selection. This was done by writing evolved warriors out to disk, using Rust's OS process interface to call out to pmars—the de facto standard MARS—and competing them to discover their relative fitness. We used Rayon—Rust's very convenient data parallelism library—to distribute the workload of competitions between available CPUs. Unfortunately, the implementation was pretty slow. Building a tournament selection criteria was maybe more difficult to express than we might have hoped—though I'm sure there a bright-spark of a reader ...