1. Distributed Multimedia Systems Resource management and Stream Adaptation Arun A Tharuvai CSC8530 October 21, 2003

2. Topics Summary of Distributed Multimedia Systems Resource Management Stream Adaptation

3. Introduction hmm

4. Characteristics of multimedia Continuous Isochronous (time-based) Bandwidth intensive Compressible

5. Quality of Service (QoS) Management Management and allocation of resources to guarantee service QoS Manager negotiates requirements with applications against existing resources

6. Resource Management Management of Resources to provide minimal QoS level to application Resource Scheduling Fair Scheduling Real time Scheduling

7. Resource Scheduling Priority determination techniques Responsiveness Fairness Deadline handling

8. Fair scheduling Round-robin queuing either by packet or by bit to prevent bandwidth clogging Equal bandwidth is assigned to each stream Weighted fair queuing is a variant

9. Real-time Scheduling Assign CPU time slots to processes, ensuring tasks EDF – Earliest Deadline First RM – Rate monotonic QoS can’t be guaranteed

10. Stream Adaptation Applications adjust performance Scaling Filtering

11. Scaling Adapt stream to the bandwidth available at source Subsample stream

12. Scaling (II) Temporal scaling Spatial scaling Frequency scaling Amplitudinal scaling Color space scaling

13. Filtering Applies scaling at nodes between source and destination Streams are partitioned into hierarchical quality dependent substreams. Dropped when node capacity is full

14. Conclusion Two techniques for ensuring that multimedia systems transfer from source to destinations Resource management Stream Adaptation