Add guest-call-stats feature with ExecutionStats API#33
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simongdavies merged 1 commit intomainfrom Mar 26, 2026
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andreiltd
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dblnz
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Great work!
This is a nice to have feature, although I think we might end up needing this pattern in hyperlight-wasm, hyperlight core and maybe other places. Maybe we could use a #[derive] to automatically add this to a sandbox? (just a thought)
Some comments below. Nothing blocking though.
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Add per-call execution statistics (wall clock, CPU time, termination info) accessible via LoadedJSSandbox::last_call_stats() behind the guest-call-stats feature flag. Rust API: - New ExecutionStats struct with wall_clock, cpu_time, terminated_by fields - last_call_stats() getter on LoadedJSSandbox (feature-gated) - Stats captured on every handle_event/handle_event_with_monitor call - Stats available even when calls error (monitor termination, guest abort) - MonitorSet::to_race() now returns winner name for stats integration Node.js (NAPI) API: - CallStats object with wallClockMs, cpuTimeMs, terminatedBy properties - lastCallStats getter on LoadedJSSandbox wrapper - guest-call-stats enabled by default in js-host-api Includes: - execution_stats example (Rust) with 6 test scenarios - 10 integration tests covering all stats paths - Updated cpu-timeout.js example with printCallStats helper - Documentation updates (execution-monitors.md, READMEs) - Justfile: test-monitors includes guest-call-stats, new example recipe Signed-off-by: Simon Davies <simongdavies@users.noreply.github.com>
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Add per-call execution statistics (wall clock, CPU time, termination info) accessible via LoadedJSSandbox::last_call_stats() behind the guest-call-stats feature flag.
Rust API:
Node.js (NAPI) API:
Includes: