700 research outputs found
EUROPEAN CONFERENCE ON QUEUEING THEORY 2016
International audienceThis booklet contains the proceedings of the second European Conference in Queueing Theory (ECQT) that was held from the 18th to the 20th of July 2016 at the engineering school ENSEEIHT, Toulouse, France. ECQT is a biannual event where scientists and technicians in queueing theory and related areas get together to promote research, encourage interaction and exchange ideas. The spirit of the conference is to be a queueing event organized from within Europe, but open to participants from all over the world. The technical program of the 2016 edition consisted of 112 presentations organized in 29 sessions covering all trends in queueing theory, including the development of the theory, methodology advances, computational aspects and applications. Another exciting feature of ECQT2016 was the institution of the Takács Award for outstanding PhD thesis on "Queueing Theory and its Applications"
Dynamic priority allocation via restless bandit marginal productivity indices
This paper surveys recent work by the author on the theoretical and
algorithmic aspects of restless bandit indexation as well as on its application
to a variety of problems involving the dynamic allocation of priority to
multiple stochastic projects. The main aim is to present ideas and methods in
an accessible form that can be of use to researchers addressing problems of
such a kind. Besides building on the rich literature on bandit problems, our
approach draws on ideas from linear programming, economics, and multi-objective
optimization. In particular, it was motivated to address issues raised in the
seminal work of Whittle (Restless bandits: activity allocation in a changing
world. In: Gani J. (ed.) A Celebration of Applied Probability, J. Appl.
Probab., vol. 25A, Applied Probability Trust, Sheffield, pp. 287-298, 1988)
where he introduced the index for restless bandits that is the starting point
of this work. Such an index, along with previously proposed indices and more
recent extensions, is shown to be unified through the intuitive concept of
``marginal productivity index'' (MPI), which measures the marginal productivity
of work on a project at each of its states. In a multi-project setting, MPI
policies are economically sound, as they dynamically allocate higher priority
to those projects where work appears to be currently more productive. Besides
being tractable and widely applicable, a growing body of computational evidence
indicates that such index policies typically achieve a near-optimal performance
and substantially outperform benchmark policies derived from conventional
approaches.Comment: 7 figure
Fluid flow models in performance analysis
We review several developments in fluid flow models: feedback fluid models, linear stochastic fluid networks and bandwidth sharing networks. We also mention some promising new research directions
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Survey of traffic control schemes and error control schemes for ATM networks
Among the techniques proposed for B-ISDN transfer mode, ATM concept is considered to be the most promising transfer technique because of its flexibility and efficiency. This paper surveys and reviews a number of topics related to ATM networks. Those topics cover congestion control, provision of multiple classes of traffic, and error control. Due to the nature of ATM networks, those issues are far more challenging than in conventional networks. Sorne of the more promising solutions to those issues are surveyed, and the corresponding results on performance are summarized. Future research problems in ATM protocol aspect are also presented
Datacenter Traffic Control: Understanding Techniques and Trade-offs
Datacenters provide cost-effective and flexible access to scalable compute
and storage resources necessary for today's cloud computing needs. A typical
datacenter is made up of thousands of servers connected with a large network
and usually managed by one operator. To provide quality access to the variety
of applications and services hosted on datacenters and maximize performance, it
deems necessary to use datacenter networks effectively and efficiently.
Datacenter traffic is often a mix of several classes with different priorities
and requirements. This includes user-generated interactive traffic, traffic
with deadlines, and long-running traffic. To this end, custom transport
protocols and traffic management techniques have been developed to improve
datacenter network performance.
In this tutorial paper, we review the general architecture of datacenter
networks, various topologies proposed for them, their traffic properties,
general traffic control challenges in datacenters and general traffic control
objectives. The purpose of this paper is to bring out the important
characteristics of traffic control in datacenters and not to survey all
existing solutions (as it is virtually impossible due to massive body of
existing research). We hope to provide readers with a wide range of options and
factors while considering a variety of traffic control mechanisms. We discuss
various characteristics of datacenter traffic control including management
schemes, transmission control, traffic shaping, prioritization, load balancing,
multipathing, and traffic scheduling. Next, we point to several open challenges
as well as new and interesting networking paradigms. At the end of this paper,
we briefly review inter-datacenter networks that connect geographically
dispersed datacenters which have been receiving increasing attention recently
and pose interesting and novel research problems.Comment: Accepted for Publication in IEEE Communications Surveys and Tutorial
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