func measurePushLatency(c *api.SyncGatewayClient, doc api.Doc) (int64, float64) {
t0 := time.Now()
c.PutSingleDoc(doc.Id, doc)
t1 := time.Now().Round(100 * time.Microsecond)
return t0.UnixNano(), float64(t1.Sub(t0.Round(100*time.Microsecond))) / math.Pow10(6)
}
