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Thread-per-core software architectures are doing this https://penberg.org/papers/tpc-ancs19.pdf

Real world examples are scylladb and Redpanda, both built on the seastar framework (C++ https://seastar.io/message-passing/).

And for rust there is glommio https://www.datadoghq.com/blog/engineering/introducing-glomm...

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There is also another thread-per-core implementation by ByteDance (TikTok) for Rust called Monoio with benchmarks[0] comparing it to Tokio and Glommio.

[0] https://github.com/bytedance/monoio/blob/master/docs/en/benc...

Does thread per core necessarily imply message passing? I don't see why the two need to be related.

The thread-per-core manifesto has a goal of not sharing data between cores, and thus the communication inside the process becomes message passing, handing off ownership of a chunk of data to the recipient core. This lack of sharing is what enables the performance (no locks etc needed, outside of the message passing).

This is a good watch (first half is pure background, second half talks about the motivation): https://www.youtube.com/watch?v=PbgTyCSDPrs

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