Current-day data centers and high-volume cloud services employ a broad set of heterogeneous servers. In such settings, client requests typically arrive at multiple entry points, dispatching them to servers is an urgent distributed systems problem. This paper presents efficient solution the load balancing problem in that improves on overcomes problems previous solutions. The formulated as stocha...

Dr. J. Mark Pullen and Douglas Corner C4I Center George Mason University Fairfax, VA 22030, USA +1 703 993 3682 [email protected] [email protected] Thomas Remmersmann and Dr. Irmtrud Trautwein Fraunhofer Institute for Communication, Information Processing and Ergonomics Fraunhofer Str. 20 53343 Wachtberg Germany +49 (0)228 9435-522 [email protected] irmtrud.trautwein@fki...

Abstmct-Consider a set of k( 22) heterogeneous and exponential servers which operate in parallel. Customers arrive into a single infinite capacity buffer according to a Poisson process, and are routed to available servers in accordance with some routing policy. We show that for arrival rates in some positive interval (0, XO], every routing policy which minimizes the long-run expected holding co...

Customers arrive to a single service queue according to a Poisson process with rate l, from which they are routed to two parallel heterogeneous and exponential servers whose ra.tes are 1'1 > #2· Customers are released from the system after service completion, according to their arrival order a requirement introducing additional resequencing delays. Customers which are delayed due to resequencin...

Using deterministic (sample-path) analysis, we generalize and extend fundamental properties of systems with “stationary deterministic flows” as introduced by Gelenbe (1983) and Gelenbe and Finkel (1987). Primarily, we provide conditions for stability and instability for general queueing models, and focus attention on multichannel queueing systems with servers that work at different rates. Stabi...

Building warehouses from existing data sources is one of the main challenges of future information systems. Over the last three years, we defined and experienced an infrastructure called Jaguar (model, language, architecture, and prototype SMIL/JMF) to configure presentations warehouse(s) managers. Such managers provide means to play and query multimedia presentations stored in a warehouse. Thi...

Usage models and applications are rapidly changing as a new class of devices (smart phones, smart TVs, etc) and rich cloud computing services (on datacenter servers) enter the marketplace. In this talk, I will start by describing some key examples of these radical changes in usage models, applications and devices. I will then highlight why the next decade of computing (clients and servers) will...

In this paper, we describe a multidatabase system as 4-tiered Client-Server DBMS architectures. We discuss their functional components and provide an overview of their performance characteristics. The first component of this proposed system is a web-based interface or Graphical User Interface, which resides on top of the Client Application Program, the second component of the system is a client...

We consider tandem lines with finite buffers and flexible, heterogeneous servers who are synergistic in that they work more effectively in teams than on their own. Our objective is to determine how the servers should be assigned dynamically to tasks in order to maximize the long-run average throughput. In particular, we investigate when it is better to take advantage of synergy among servers, r...

A number of recent technological trends have made data intensive applications such as continuous media (audio and video) servers a reality. These servers store and retrieve a large volume of data using magnetic disks. Servers consisting of heterogeneous disk drives have become a fact of life for several reasons. First, disks are mechanical devices that might fail. The failed disks are almost al...