A New Real-Time Streaming Scheme for Video Objects in Flash Storage
Owing to high popularities of video streaming services such as YouTube, Netflix and portals’ UCC, we have seen the drastic growth of multimedia streaming traffic in the Internet. For the lasting proliferation of streaming services in the future, it is crucial to deploy cost-effective video servers that can fulfill bandwidth requirements asked for by a large number of online users. To this end, we propose a real-time scheduling scheme that can efficiently exploit I/O characteristics of flash SSD (solid state drive). To fully utilize the advantages of the fast block-based data retrieval in flash SSD, we trace bandwidth demands of serviced streams in real-time mode. Based on the bandwidth requirements being traced, our flash-aware video server decides the retrieval orders of demanded disk blocks in a cyclic manner. In addition, using the uniform speeds of flash’s random reads, we devise an EDF algorithm suitable for periodic scheduling. To expedite playback starting points of video streams, we employ the reservation-based EDF algorithm, which was originally designed for scheduling a mixture of sporadic and periodic tasks. Because of the out-of-band bandwidth from the reservation-based EDF algorithm, our scheduler can efficiently shorten the average waiting time of playback requests, while preventing undesirable hiccups of video streams.
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Document Type: Research Article
Affiliations: Department of Computer Science, Dongduk Women’s University, South Korea
Publication date: November 1, 2016
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