Experiences with Client Based Speculative Remote Display基于客户端远程显示经验与思辨.ppt

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2018-06-15 发布于福建
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Experiences with Client Based Speculative Remote Display基于客户端远程显示经验与思辨.ppt

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Experiences with Client Based Speculative Remote Display基于客户端远程显示经验与思辨

Experiences with Client-based Speculative Remote Display John R. Lange Peter A. Dinda Department of Electrical Engineering and Computer Science Northwestern University Sam Rossoff Department of Computer Science University of Victoria Prescience Lab Speculative Remote Display Remote display interactivity fundamentally constrained by network latency Critical for WANs Speculation can improve interactivity Can be done without server support Significant predictability exists in remote display protocol streams Speculation can be introduced into remote display clients User-controlled tradeoff between latency and display errors User studies currently give mixed results for tradeoff Outline Speculative Remote Display Predictability study of Remote Display protocol streams RDP and VNC Design and implementation of a client-based speculative remote display system VNC-SRD User study of VNC-SRD Examination of user-controlled speculation Conclusions Remote Display Systems Historically popular in many forms VNC, RDP, THINC, Citrix, X Thin clients, remote administration, mobile users, etc Implemented at all levels of the stack Virtual hardware, device drivers, window system extensions Large variance in semantic properties of the protocols Lots of work has gone into optimizing Remote Displays Predominantly to decrease bandwidth requirements Latency vs. BandwidthOptimization Large amount of work in optimizing bandwidth usage of Remote Displays Compression/encoding, caching, protocol design Bandwidth is important… But so is interactivity User interaction implies waiting for server updates Network latency is a critical component Prospects for Speculative Remote Display Optimizing Latency Through Speculation Speculation can improve interactivity Display screen events before they arrive RTT is no longer limiting factor UI Interaction intuitively appears to be predictable Menus, dialog boxes, etc Often tied to specific user action Questions Is there predictability? How do we d