Browsing by Author "Ramakrishnan, Siddharth"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Early Experience with Mobile Computation Outsourcing
    (2010-08-25) Ramakrishnan, Siddharth; Reutiman, Robert; Iverson, Harlan; Lian, Shimin; Chandra, Abhishek; Weissman, Jon
    End-user mobile devices such as smart phones, PDAs, and tablets, offer the promise of anywhere, anytime computing and communication. Users increasingly expect their mobile device to support the same activities (and same performance) as their desktop counterparts: seamless multitasking, ubiquitous data access, social networking, game playing, and real work, while on-the-go. To support mobility, these devices are typically constrained in terms of their compute power, energy, and network bandwidth. Supporting the full-array of desired desktop applications and behavior yet retaining the flexibility of the mobile cannot always be met using local resources alone. To achieve this vision, additional resources must be easily harnessed on-demand. In this paper, we describe opportunities for mobile outsourcing using external proxy resources. We present several application scenarios and preliminary results.
  • Thumbnail Image
    Item
    Standing on the Shoulders of Others: Using Proxies to Opportunistically Boost Distributed Applications
    (2010-05-25) Ramakrishnan, Siddharth; Reutiman, Robert; Chandra, Abhishek; Weissman, Jon
    Distributed applications are increasingly relying on and integrating remote resources including community data sources, services, and computational platforms. The coupling of distributed resources for data-intensive applications can expose bottlenecks across highly shared pathways, e.g. the network. In this paper, we consider applications that access remote clouds for data, computation, or services, and focus on alleviating the bottlenecks that they may encounter by using middleware deployed on a proxy network. We propose a proxy network that sits between the cloud and the end-user application offering resources to mitigate bottlenecks. In particular, we show how proxies can eliminate network bottlenecks by smart routing and perform in-network computations to boost application performance. We build on existing literature to create a unique synthesis of ideas that is the proxy network. Our results obtained through experiments on PlanetLab are promising, showing substantial improvement in latency, bandwidth, and even jitter, which can benefit a wide class of data-intensive applications. Our microbenchmarks show that routing data through select proxies can accelerate network transfer by at least 25% in almost half the cases considered. Experiments using a distributed Montage workflow mapped on a WAN showed 13% end-to-end performance improvement when data was routed through a proxy network. In addition, proxies also reduced the montage output data delivery time to users on mobile devices by 65-80% through compression and data transformation.