succd: run at 100Hz, monitor load and jitter

succbone/succd/http.go

@@ -70,6 +70,9 @@ type apiData struct {
 		// HighReached is true when the system has reached a high vacuum stage.
 		HighReached bool
 	}
+	// LoopLoad is a percentage expressing how busy the processing loop is; 100
+	// is full utilization; >100 is lag.
+	LoopLoad int64
 	// System junk.
 	System struct {
 		// Load of the system.
@@ -114,6 +117,7 @@ func (s *webServer) apiData(skipSystem bool) *apiData {
 	ad.Pumps.DPOn = state.dpOn
 	ad.Feedback.RoughReached = rough
 	ad.Feedback.HighReached = high
+	ad.LoopLoad = s.d.loopLoad()
 	ad.System.Load = load
 	ad.System.Hostname = hostname
 	return &ad