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a50df01e4b
Measures the full C++ -> Nim -> C++ foreign round trip across setups: scalar family (2 x int64 + float64), payload family (seq[byte], size sweep incl. large payloads), and event delivery — through sync, async (bounded in-flight window) and event lanes, over a thread-count sweep. All handlers compute the same O(1) parity predicate, so setups differ purely in transport cost. Every reply is verified; a bad reply or lost event exits non-zero. `nimble perf_cpp_e2e` regenerates the cpp bindings, builds libperfbench with -d:danger over the NIM_FFI_MM matrix (orc + refc) — deliberately bypassing the debug-orc nim_ffi_lib.cmake template build — and runs the Release driver. NIM_FFI_PERF_* env knobs control threads, volume, iterations and payload sizes; each table row also emits a csv line for diff-friendly capture. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>