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> none of the library are matures.

Rayon, the Rust library getting most of the discussion in this thread, is now 1.0: https://github.com/rayon-rs/rayon/blob/master/RELEASES.md .

Don't most people opt for something called Tokyo? I don't do Rust much, but even I have heard of it by now...

Tokio for IO concurrency, Rayon for data parallelism.

Exactly! Rust doesn't solve any parallelism problems. It's no better than established languages like C# or F#, and probably worse.

I'd consider handling data races gracefully a pretty large step forward in doing parallel data computation.