32 research outputs found
Tactics-Based Remote Execution for Mobile Computing
into a computing giant able to run resource-intensive applications such as natural language translation, speech recognition, face recognition, and augmented reality. However, easily partitioning these applications for remote execution while retaining application-specific information has proven to be a difficult challenge. In this paper, we show that automated dynamic repartitioning of mobile applications can be reconciled with the need to exploit application-specific knowledge. We show that the useful knowledge about an application relevant to remote execution can be captured in a compact declarative form called tactics. Tactics capture the full range of meaningful partitions of an application and are very small relative to code size. We present the design of a tactics-based remote execution system, Chroma, that performs comparably to a runtime system that makes perfect partitioning decisions. Furthermore, we show that Chroma can automatically use extra resources in an overprovisioned environment to improve application performance
Mobile, collaborative augmented reality using cloudlets
The evolution in mobile applications to support advanced interactivity and demanding multimedia features is still ongoing. Novel application concepts (e.g. mobile Augmented Reality (AR)) are however hindered by the inherently limited resources available on mobile platforms (not withstanding the dramatic performance increases of mobile hardware). Offloading resource intensive application components to the cloud, also known as "cyber foraging", has proven to be a valuable solution in a variety of scenarios. However, also for collaborative scenarios, in which data together with its processing are shared between multiple users, this offloading concept is highly promising. In this paper, we investigate the challenges posed by offloading collaborative mobile applications. We present a middleware platform capable of autonomously deploying software components to minimize average CPU load, while guaranteeing smooth collaboration. As a use case, we present and evaluate a collaborative AR application, offering interaction between users, the physical environment as well as with the virtual objects superimposed on this physical environment
Vision: a Lightweight Computing Model for Fine-Grained Cloud Computing
Cloud systems differ fundamentally in how they offer and
charge for resources. While some systems provide a generic
programming abstraction at coarse granularity, e.g., a virtual machine rented by the hour, others offer specialized
abstractions with fine-grained accounting on a per-request
basis. In this paper, we explore Tasklets, an abstraction for
instances of short-duration, generic computations that migrate from a host requiring computation to hosts that are
willing to provide computation. Tasklets enable fine-grained
accounting of resource usage, enabling us to build infrastructure that supports trading computing resources according to
various economic models. This computation model is especially attractive in settings where mobile devices can utilize
resources in the cloud to mitigate local resource constraints
Leveraging cloudlets for immersive collaborative applications
To enable immersive applications on mobile devices, the authors propose a component-based cyber foraging framework that optimizes application-specific metrics by not only offloading but also configuring application components at runtime. It also enables collaborative scenarios by sharing components between multiple devices
A Low-Energy Fast Cyber Foraging Mechanism for Mobile Devices
The ever increasing demands for using resource-constrained mobile devices for
running more resource intensive applications nowadays has initiated the
development of cyber foraging solutions that offload parts or whole
computational intensive tasks to more powerful surrogate stationary computers
and run them on behalf of mobile devices as required. The choice of proper mix
of mobile devices and surrogates has remained an unresolved challenge though.
In this paper, we propose a new decision-making mechanism for cyber foraging
systems to select the best locations to run an application, based on context
metrics such as the specifications of surrogates, the specifications of mobile
devices, application specification, and communication network specification.
Experimental results show faster response time and lower energy consumption of
benched applications compared to when applications run wholly on mobile devices
and when applications are offloaded to surrogates blindly for execution.Comment: 12 pages, 7 figures, International Journal of Wireless & Mobile
Networks (IJWMN
On Optimal and Fair Service Allocation in Mobile Cloud Computing
This paper studies the optimal and fair service allocation for a variety of
mobile applications (single or group and collaborative mobile applications) in
mobile cloud computing. We exploit the observation that using tiered clouds,
i.e. clouds at multiple levels (local and public) can increase the performance
and scalability of mobile applications. We proposed a novel framework to model
mobile applications as a location-time workflows (LTW) of tasks; here users
mobility patterns are translated to mobile service usage patterns. We show that
an optimal mapping of LTWs to tiered cloud resources considering multiple QoS
goals such application delay, device power consumption and user cost/price is
an NP-hard problem for both single and group-based applications. We propose an
efficient heuristic algorithm called MuSIC that is able to perform well (73% of
optimal, 30% better than simple strategies), and scale well to a large number
of users while ensuring high mobile application QoS. We evaluate MuSIC and the
2-tier mobile cloud approach via implementation (on real world clouds) and
extensive simulations using rich mobile applications like intensive signal
processing, video streaming and multimedia file sharing applications. Our
experimental and simulation results indicate that MuSIC supports scalable
operation (100+ concurrent users executing complex workflows) while improving
QoS. We observe about 25% lower delays and power (under fixed price
constraints) and about 35% decrease in price (considering fixed delay) in
comparison to only using the public cloud. Our studies also show that MuSIC
performs quite well under different mobility patterns, e.g. random waypoint and
Manhattan models