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In-Depth Information
Broadband Network
Peer with Video Objects
Requesting Peer
Admission
Control
Request
Manager
User
Interface
QoS
Manager
Indexing Peer
Query
Manager
Memory
for Video
Objects
Storage
Manager
Multimedia
Indexing
Data
Data
Data
Data
FIGURE 3.16: The SIMS/MIMS network architecture [Kalogeraki et al.,
2003].
network architecture is essentially the same as an unstructured P2P network
(e.g., Gnutella) in which every peer maintains only its local video objects'
information.
Kalogeraki et al. then performed simulations to evaluate the performance
of the three different architectures. Firstly, they conducted tests to determine
the e ciency with which each architecture can reply to a given user request.
Specifically, the number of messages needed is counted as the major overhead.
It was found that the SIMS/MIMS architecture needs the least number of
messages to start the downloading process. On average, the MIIS architecture
achieved very similar performance. This is plausibly because as the number
of user requests increases, each server/peer adds the locations of more video
objects in its local index, as well as attempts to download the most popular
video objects. Finally, the overhead expended in the FAMS architecture is the
highest and can increase dramatically. This is because of the random search
ine ciency—in the worst case, a request has to traverse many nodes before
reaching a node that contains the sought video object.
Secondly, they examined the performance of the video object replication
in the MIIS architecture. In general, the replication algorithm was effective
in that popular video objects were widely replicated while unpopular video
objects got a small replication degree.
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