這套軟體用 Ruby 寫，其實就是個 sniffer + packet analyzer，但這套軟體有效能問題。在流量很高的時候無法處理所有封包，而變成 sampling 類型的監控。
This was originally inspired by mctop from etsy. I found that under load mctop would drop between 50 and 75 percent of packets. Under the same load memkeys will typically drop less than 3 percent of packets. This is on a machine saturating a 1Gb network link.