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shadow
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fast-caspaxos
Fast CASPaxos: Fast Paxos optimizations applies to CASPaxos for 1RTT multi-leader commit
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Cool, will be interested to see how this develops! tokio's loom framework has been a big help in testing some tricky concurrency code I've worked on.
Folks interested in this space might also be interested in the system I spend most of my time working on: Shadow. It also performs deterministic simulation of a network of hosts, but it intercepts network and system interactions at the syscall level via seccomp. As such it can work with binaries compiled from ~any language, usually without any code modification or special compilation. https://shadow.github.io/
I used it to test an idea I had to implement the Fast Paxos optimization on top of CASPaxos and it was quite useful for that: https://github.com/ReubenBond/fast-caspaxos (the code is bad, it's just an experiment)
My team used Coyote to test their distributed service against network race conditions. It requires a little bit of setup to ensure all components that typically run on separate machines can run in a single process, and inter-process communication happens through interfaces that can be stubbed out during testing.
I designed a series of workshops to teach these ideas internally at Microsoft. You can find the source code used in the workshop at https://github.com/microsoft/coyote-workshop - the repo can use better README files but sharing it nonetheless in case the setup helps inspire your own use of Coyote.