| The Legion Support for Advanced Parameter-Space Studies on a Grid |
2006 |
17 pages |
| Authors:
Anand Natrajan; Marty A. Humphrey; Andrew S. Grimshaw; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
 | Parameter-space studies involve running a single application several times with different parameter sets. Since the jobs are mutually independent, many computing resources can be recruited to conduct an entire study in a distributed manner. Parameter-space studies are attractive applications for grids, which are networked collections of computing and other resources. Legion is a grid infrastructure that facilitates the secure and easy use of heterogeneous, geographically-distributed resources by providing the illusion ... |
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| Campus-Wide Computing: Early Results Using Legion at the University of Virginia |
2006 |
26 pages |
| Authors:
Andrew S. Grimshaw; Anh Nguyen-Tuong; William A. Wulf; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
| The Legion project at the University of Virginia is an attempt to provide system services that provide the illusion of a single virtual machine to users, a virtual machine that provides both improved response time via parallel execution and greater throughput. Legion is targeted towards both workstation clusters and towards larger, wide-area, assemblies of workstations, supercomputers, and parallel supercomputers. Rather than construct Legion from scratch we are extending an existing ... |
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| Fault Tolerance via Replication in Coarse Grain Data-Flow |
2006 |
17 pages |
| Authors:
Anh Nguyen-Tuong; Andrew S. Grimshaw; John F. Karpovich; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
| Recent advances in network technology promise to make gigabit-per-second bandwidth between remote hosts a reality in the near future. This increase in bandwidth paves the way for increased exploitation of distributed computing resources. Coupled with advances in distributed memory parallel compiler technology, there is strong reason to believe that wide-area distributed parallel processing will be an increasingly popular and important programming paradigm. Parallelizing and distributing program sub-tasks has the potential ... |
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| From Legion to Avaki: The Persistence of Vision |
2006 |
31 pages |
| Authors:
Andrew S. Grimshaw; Anand Natrajan; Marty A. Humphrey; Michael J. Lewis; Anh Nguyen-Tuong; John F. Karpovich; Mark M. Morgan; Adam J. Ferrari; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
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| Grids have metamorphosed from academic projects to commercial ventures. Avaki, a leading commercial vendor of Grids, has its roots in Legion, a Grid project at the University of Virginia begun in 1993. In this chapter, we present fundamental challenges and requirements for Grid architectures that we believe are universal, our architectural philosophy in addressing those requirements, an overview of Legion as used in production systems and a synopsis of the ... |
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| Support for Extensibility and Site Autonomy in the Legion Grid System Object Model |
2006 |
21 pages |
| Authors:
Michael J. Lewis; Adam J. Ferrari; Marty A. Humphrey; John F. Karpovich; Mark M. Morgan; Anand Natrajan; Anh Nguyen-Tuong; Glenn S. Wasson; Andrew S. Grimshaw; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
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| Grid computing is the use of large collections of heterogeneous, distributed resources (including machines, databases, devices, and users) to support large scale computations and wide-area data access. The Legion system is an implementation of a software architecture for grid computing. The basic philosophy underlying this architecture is the presentation of all grid resources as components of a single, seamless, virtual machine. Legion's architecture was designed to address the challenges of ... |
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| Dispelling Seven Myths about Grid Resource Management |
2004 |
25 pages |
| Authors:
Anand Natrajan; Andrew S. Grimshaw; Marty A. Humphrey; Anh Nguyen-Tuong; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
| Grid resource management is often viewed as scheduling for large long running computer intensive parallel applications. This view is narrow, as we will argue in this article. Grids today encompass diverse resources including machines users and applications. Moreover, grid users make different demands from different resources. Therefore grid infrastructures must adopt a greater responsibility than before for managing resources. Grid resource management cannot mean just scheduling jobs on the fastest ... |
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| A Philosophical and Technical Comparison of Legion and Globus |
15 OCT 2003 |
23 pages |
| Authors:
Andrew S. Grimshaw; Marty A. Humphrey; Anand Natrajan; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
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| Grids are collections of interconnected resources harnessed to satisfy various needs of users. Legion and Globus are pioneering grid technologies. Several of the aims and goals of both projects are similar, yet their underlying architectures and philosophies differ substantially. The scope of both projects is the creation of worldwide grids; in that respect, they subsume several distributed systems technologies. However, Legion has been designed as a virtual operating system (OS) ... |
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| Architectural Support for Extensibility and Autonomy in Wide-Area Distributed Object Systems |
03 JUN 1998 |
58 pages |
| Authors:
Andrew S. Grimshaw; Michael J. Lewis; Adam J. Ferrari; John F. Karpovich; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
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| The Legion system defines a software architecture designed to support metacomputing, the use of large collections of heterogeneous computing resources distributed across local- and wide-area networks as a single, seamless virtual machine. Metasystems software must be extensible because no single system can meet all of the diverse, often conflicting, requirements of the entire present and future user community, nor can a system constructed today take best advantage of unanticipated future ... |
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| Exploiting Data-Flow for Fault-Tolerance in a Wide-Area Parallel System |
1996 |
11 pages |
| Authors:
Anh Nguyen-Tuong; Andrew S. Grimshaw; Mark Hyett; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
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| Wide-area parallel processing systems will soon be available to researchers to solve a range of problems. In these systems, it is certain that host failures and other faults will be a common occurrence. Unfortunately, most parallel processing systems have not been designed with fault-tolerance in mind. Mentat is a high-performance objec t-oriented parallel processing system that is based on an extension of the data-flow model. The functional nature of data-flow ... |
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