Dummynet: a simple approach to the evaluation of network protocols
ACM SIGCOMM Computer Communication Review
Acceptable strategies for improving web server performance
ATEC '04 Proceedings of the annual conference on USENIX Annual Technical Conference
Understanding and addressing blocking-induced network server latency
ATEC '06 Proceedings of the annual conference on USENIX '06 Annual Technical Conference
Comparing the performance of web server architectures
Proceedings of the 2nd ACM SIGOPS/EuroSys European Conference on Computer Systems 2007
Generating realistic impressions for file-system benchmarking
FAST '09 Proccedings of the 7th conference on File and storage technologies
Reducing Disk I/O Performance Sensitivity for Large Numbers of Sequential Streams
ICDCS '09 Proceedings of the 2009 29th IEEE International Conference on Distributed Computing Systems
Optimizing energy and performance for server-class file system workloads
ACM Transactions on Storage (TOS)
Dynamic adaptive streaming over HTTP --: standards and design principles
MMSys '11 Proceedings of the second annual ACM conference on Multimedia systems
Watching Video over the Web: Part 1: Streaming Protocols
IEEE Internet Computing
Over the top video: the gorilla in cellular networks
Proceedings of the 2011 ACM SIGCOMM conference on Internet measurement conference
YouTube everywhere: impact of device and infrastructure synergies on user experience
Proceedings of the 2011 ACM SIGCOMM conference on Internet measurement conference
Our troubles with Linux and why you should care
Proceedings of the Second Asia-Pacific Workshop on Systems
Dynamic adaptive streaming over HTTP dataset
Proceedings of the 3rd Multimedia Systems Conference
Methodologies for generating HTTP streaming video workloads to evaluate web server performance
Proceedings of the 5th Annual International Systems and Storage Conference
Our troubles with Linux Kernel upgrades and why you should care
ACM SIGOPS Operating Systems Review
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Large amounts of Internet streaming video traffic are being delivered using HTTP to leverage the existing web infrastructure. A fundamental issue in HTTP streaming concerns the granularity of video objects used throughout the HTTP ecosystem (including clients, proxy caches, CDN nodes, and servers). A video may be divided into many files (called chunks), each containing only a few seconds of video at one extreme, or stored in a single unchunked file at the other. In this paper, we describe the pros and cons of using chunked and unchunked videos. We then describe a methodology for fairly comparing the performance implications of video object granularity at web servers. We find that with conventional servers (userver, nginx and Apache) there is little performance difference between these two approaches. However, by aggressively prefetching and sequentializing disk accesses in the userver, we are able to obtain up to double the throughput when serving requests for unchunked videos when compared with chunked videos (even while performing the same aggressive prefetching with chunked videos). These results indicate that more research is required to ensure that the HTTP ecosystem can handle this important and rapidly growing workload.