Partial workaround for meter during a clock jump

rcrowley · Jan 2, 2017 · 735b61b · 735b61b
1 parent a7cba3c
commit 735b61b
Showing 1 changed file with 7 additions and 4 deletions.
diff --git a/meter.go b/meter.go
@@ -190,10 +190,13 @@ func (m *StandardMeter) Snapshot() Meter {
 func (m *StandardMeter) updateSnapshot() {
 	// should run with write lock held on m.lock
 	snapshot := m.snapshot
-	snapshot.rate1 = m.a1.Rate()
-	snapshot.rate5 = m.a5.Rate()
-	snapshot.rate15 = m.a15.Rate()
-	snapshot.rateMean = float64(snapshot.count) / time.Since(m.startTime).Seconds()
+	elapsed := time.Since(m.startTime).Seconds()
+	if elapsed > 0 {
+		snapshot.rate1 = m.a1.Rate()
+		snapshot.rate5 = m.a5.Rate()
+		snapshot.rate15 = m.a15.Rate()
+		snapshot.rateMean = float64(snapshot.count) / elapsed
+	}
 }
 
 func (m *StandardMeter) tick() {