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THINC: A Virtual Display Architecture for Thin-Client Computing - - PowerPoint PPT Presentation
THINC: A Virtual Display Architecture for Thin-Client Computing - - PowerPoint PPT Presentation
THINC: A Virtual Display Architecture for Thin-Client Computing Ricardo A. Baratto, Leonard N. Kim, Jason Nieh Network Computing Laboratory Columbia University isolation... ...connectivity Source: Internet Mapping Project
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Source: Internet Mapping Project (http://research.lumeta.com/ches/map/)
...connectivity
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dis-integration of the computer
network storage clusters and grid computing
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remote display
display updates input
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benefits
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ubiquitous access
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remote collaboration
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- nline help
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stateless client application processing and data secure server room
thin clients
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existing systems
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existing performance problem
0% 20% 40% 60% 80% 100% PC ICA RDP GoToMyPC X NX VNC Sun Ray
audio/video quality
LAN WAN
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THINC
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virtual display architecture high performance remote display transparent operation
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- system architecture
- display protocol
- translation
- delivery
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system architecture
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applications window system device driver framebuffer
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applications window system device driver framebuffer
high-level requests
interception and redirection
✗ stateful client hurts
mobility
✗ app – window system
synchronization
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applications window system framebuffer device driver
raw pixels high-level requests
interception and redirection
✗ lose semantics:
difficult to encode
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applications window system virtual device driver
display updates input events
virtual display architecture
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Standard Interface
applications window system virtual device driver
benefits
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Leverage existing technology
applications window system virtual device driver
benefits
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virtual device driver
display updates
Simple, low-level protocol
benefits
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virtual device driver
display updates input events
Simple, stateless client
benefits
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display protocol
Inspired by Sun Ray protocol 2D Primitives
- copy
- solid and tile fill
- bitmap fill
- raw
Video
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two key problems
how do we translate from application commands to the display protocol? how and when do we send display updates?
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translation
use and preserve semantic information for efficient translation
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- use semantic information when
doing translation
translation
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use request semantics to generate update
req: fill window W, color C
application window system
req: fill [x,y,w,h] color C
THINC
update: solid fill [x,y,w,h] color C
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✔use semantic information when
doing translation
- preserve semantic information
throughout the system
translation
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preserving semantics:
- ffscreen rendering
draw
- ffscreen regions
abcde
copy
abcde
display
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- ffscreen rendering (cont)
- ffscreen region
command log merge, clip, and discard commands as needed
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using and preserving semantics: video
- reuse existing hardware acceleration
application interfaces
- YUV (luminance-chrominance) color
space
– format independence – client hardware acceleration (scaling
for free)
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delivery
maximize interactive response of the system
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delivery
- transmit updates as soon as possible
- merge, clip, and discard updates as
needed
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shortest remaining size first scheduler
client buffer C1 C2 C3 ... Cn real time . . . queue 1 queue p cmd size
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implementation
- X/Linux server
– ongoing: windows server
- X/Linux, windows, PDA, Java clients
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experimental results
- web and video performance
– comparison to existing systems – Internet 2 sites around the globe
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“ ”
LAN WAN 802.11g
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web browsing performance
0.5 1 1.5 2 2.5 3 PC ICA RDP GoToMyPC X NX VNC Sun Ray THINC
per web page latency (s)
Desktop LAN Desktop WAN 802.11g PDA
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a/v playback quality
0% 20% 40% 60% 80% 100% PC ICA RDP GoToMyPC X NX VNC Sun Ray THINC
audio/video quality
Desktop LAN Desktop WAN 802.11g PDA
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NY MA PA MN NM CA
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CA IE FI KR PR
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Internet2 web browsing performance
0.5 1 1.5 2 ny pa ma mn nm ca can pr ie fi kr location page latency (s)
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Internet2 a/v playback quality
0% 20% 40% 60% 80% 100% ny pa ma mn nm ca can pr ie fi kr location playback quality
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demo
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conclusions
THINC:
- virtual display architecture transparently
leverages existing display infrastructure
- efficient translation by using and preserving
semantic information from display request
- delivery mechanisms increase
responsiveness of the system
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