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Inter-application I/O contention and performance interference have been recognized as severe problems. In this work, we demonstrate, through measurement from Titan (world's No. 3 supercomputer), that high I/O variance co-exists with the fact that individual storage units remain under-utilized for the majority of the time. This motivates us to propose AID, a system that performs automatic application...
High throughput is of particular interest in data center and HPC networks. Although myriad network topologies have been proposed, a broad head-to-head comparison across topologies and across traffic patterns is absent, and the right way to compare worst-case throughput performance is a subtle problem. In this paper, we develop a framework to benchmark the throughput of network topologies, using a...
As Communication Service Providers (CSPs) adopt the Network Function Virtualization (NFV) paradigm they need to transition their network function capacity to a virtualized infrastructure with different Network Functions (NFs) running on a set of heterogeneous servers. This paper describes a novel technique for allocating server resources (compute, storage and network) for a given set of Virtual Network...
Pakistan is a rapidly growing cellular market with a growth rate of 185 % in number of mobile broadband users during 2014-16 and over 15.75 million mobile broadband users [4]. The exponential increase in broadband penetration demands investigation of mobile broadband performance from an end user perspective. To the best of our knowledge, no extensive study exists to document mobile broadband services...
Since the early days of Quality of Experience (QoE) research, relationships to Quality of Service (QoS) and corresponding QoE-QoS models have been of great interest to the research community. However, the manifold quality transformations throughout the communication stack, together with accessibility issues of QoS parameters inside networks, hamper availability, applicability and generality of such...
The main contribution of this paper is to show an implementation of the parallel convex hull algorithm on the Parallella architecture. Parallella is a single-board computer with 16 mesh-connected cores. We have considered the memory architecture and mesh-connected network of the Parallella architecture. We evaluated the computing time and the energy-efficiency by comparing with various computing platforms...
Previously, we proposed the active access-point (AP) configuration algorithm for elastic Wireless Local-Area Network (WLAN) systems using heterogeneous APs. This algorithm activates or deactivates APs depending on traffic demands, assuming that any active AP can use a different channel to avoid interferences among APs. However, the number of non-interfered channels in IEEE 802.11 protocols is limited...
Wireless multi-hop networks are scalable in that devices can easily connect to the network. Such scalability is also required in IoT. However, wireless multi-hop network mostly suffers from high probability of transmission failure due to interference, and nodes connected to the network often experience connection loss and subsequent segment loss which node mobility and routing update incur. Due to...
With the recent roll-out of 100 Gbit Ethernet technology for high-performance computing applications and the technology for 100 Gbit wireless communication emerging on the horizon, it is just a matter of time until non-high performance computing applications will have to utilize these data rates. Since 10 Gbit/s protocol processing is already challenging for current server machines and simply upscaling...
With Netflix and YouTube accounting for more than 50% of North American, fixed network peak download traffic in 2015, video streaming is a significant source of Internet traffic. Dynamic Adaptive Streaming over HTTP (DASH) is a recent standard for live and on-demand video streaming services, where clients adapt their behaviour on-the-fly to match regularly updated estimates of network capacity. Consumer...
The paper describes a generic Cloud Roboticsteleoperation system which allows to control in real-time arobot (connected with a 4G network) having its video streamas feedback. The proposed system relies on the Azure CloudPlatform and on recent web technologies. Particularly, wepresent an use case experiment in which an operator in Slovakiacontrols a robot situated in Italy in order to evaluate its...
RFID technology suffers from a recurring issue: the reader-to-reader collision. Numerous protocols have been proposed to attempt to reduce them, but, remaining reading errors still heavily impact the performances and fairness of dense RFID deployments. This paper introduces a new Distributed Efficient & Fair Anticollision for RFID (DEFAR) protocol. It reduces both monochannel and multichannel...
Latest research in smart grid communications has advocated the aggregation of multiple traffic flows in order to achieve an improved throughput. While aggregation improves the overall throughput, the individual flows still suffer from unfair throughput performance. As a result, the enablers for time sensitive smart grid services such as load-shedding that require a timely report of data are the most...
Key-value stores such as Memcached have become widely used by cloud and web-service providers. While there has been a significant amount of research done on improving the absolute performance of key-value stores, this work proposes an adaptive and a flexible approach to key-value stores. We first propose soft data partitioning that divides memory into multiple groups within a single node, or a single...
Network Function Virtualization (NFV) is an emerging network architecture that employs the concept of virtualization and allows the consolidation of many network services on top of an industry standard off-the-shelf server. This decoupling of network functions and services from dedicated and expensive hardware appliances has led the Enterprise and Service Providers to increasingly make use of Virtualized...
Content delivery networks (CDNs) carry a large portion of today's web traffic. Any improvement in their performance would have a direct impact on Internet users' experience. We propose a client-centric approach to improve the content delivery performance of CDNs with minimal alteration of the current CDN platform. A preliminary evaluation of our approach based on traffic traces from a large organization...
NoSQL databases offer high throughput, support for huge data structures, and capacity to scale horizontally at the expense of not supporting relational data, ACID consistency and a standard SQL syntax. Due to their simplicity and flexibility, NoSQL databases are becoming very popular among web application developers. However, most NoSQL databases only provide basic backup and restore mechanisms, which...
Large-scale distributed file system is an important technology for big data sciences. Several works so far have succeeded in high-bandwidth data I/O on multi-point to multi-point remote storage systems. However, for easy use by many scientific researchers, high-bandwidth remote storage tools working on a single client computer are preferable. As for high-bandwidth multi-point to single-point remote...
In-network guidance for off-path caching, called Breadcrumbs, has been proposed for cache networks. In Breadcrumbs, during content download, a router holds a pointer, breadcrumb, which denotes the latest download direction. When a content request occasionally encounters a breadcrumb along its default-path to the repository, location-based routing is switched to hop-by-hop breadcrumb-based routing...
Digital TV broadcast technology is growing rapidly. One among many digital TV standards that has been develoved is DVB standard. When we want to use non-DVB enabler device such as general smartphone as a DVB receiver, we need to develop applications that can run on that device. In this paper, it is presented how we develop such application and emphasize in designing Electronic Service Guide (ESG)...
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