Improving VNCPerformance with theSmart Proxy ArchitectureCynthia Taylor, Joe PasqualeUCSD Introduction What is Thin Client Computing? Why Thin Clients? What is VNC? Latency and Performance Defining Performance The Smart Proxy Architecture Results & ConclusionWhat is Thin ClientComputing?internetWhat is Thin ClientComputing?internetUser inputWhat is Thin ClientComputing?internetUser inputScreen updatesWhy Thin Clients?Lightweight DevicesWhy Thin Clients?Intensive Applications Machine Learning/Vision Object recognition Speech recognition Graphics Rendering Data Storage VideoWhy Thin Clients?Security & Data Loss A lost laptop doesn’t mean lost data Helps companies stay compliant withprivacy laws such as HIPAAWhat Is VNCclient serverupdateclient serverupdaterequestServer PushClient Pull• VNC is a widely-used thin client systemwith several available open-sourceimplementations.Latency and PerformanceinternetThin ClientDesktopDefining Performanceclientserverrequestclient serverupdateclientserverclient server2. Client waits3. Server sends update 4. Client processes update1. Client requests new update Introduction The Smart Proxy Architecture Resource Assumptions The Smart Proxy Architecture The Proxy & VNC Example Results & ConclusionResource Assumptions: ActiveWireless Spacescomputingresources clientwirelesslinkserverserverinternetcomputingresourcesclientclientSmart Proxy ArchitectureserverclientPDAGPSvideoearpiecesmartproxyworldwebservergameserverweb serverwireless internetThe Proxy and VNCserverclient proxyrequestrequestupdate update The Smart Proxy sends requests to the server at therate the client is processing them, without waiting foran update from the server This lets the Smart Proxy adjust for time delaysbetween the client and serverExampleserverclient200 ms Client sends request - 200 ms Server processes - 5 ms Server sends update - 200 ms Client processes - 5 msTotal time = 410 msExampleserverclientproxy185 ms15 ms Proxy processes - 5 ms Proxy sends update to Client - 15 ms Client processes - 5 ms Client sends request - 15 msTotal time = 40 msExampleserverproxy The proxy sends requests to the server at thesame rate the client is processing them, withoutwaiting for a response from the serverrequest every 40 msupdate every 40 ms……ResultsConclusion We can improve VNC performance by havinga Smart Proxy mediate the update rate overnetwork delays. Faster thin clients can help us integratepowerful computing into our mobile