Deterministic Simulation And Reproducibility

Operator's service-under-test reads the wall clock via the OS, opens a TCP socket, and seeds its RNG from /dev/urandom. They run it under Antithesis and expect a found bug to replay identically.

Run the entire system inside the Antithesis deterministic hypervisor so the clock, network, thread scheduling, and randomness are all controlled by the simulator — that is what makes a run reproducible. Do NOT bypass the simulated environment (e.g., calling out to a real external clock/API), becaus…

A consensus bug only manifests after a long sequence of events. The operator wants to inspect state just before the corrupting write, not after the crash.

Use the platform's ability to rewind the deterministic timeline (time-travel / branching) to step backward from the failure to the decision point that caused it, inspecting intermediate state at each step. This is possible precisely because the run is deterministic and replayable; do not approximat…

The SUT mixes a Go service and a Rust service. The operator wonders whether determinism only holds for one language.

Recognize that determinism is provided by the hypervisor at the system level, below the language runtime — it is language-agnostic for the containerized processes it runs. The SDK (assertions, instrumentation) is what is language-specific. [REQUIRES-VERIFICATION] for the exact current set of suppor…