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A dominating set S of a graph G is perfect if each vertex of G is dominated by exactly one vertex in S. We study the existence and construction of PDSs in families of graphs arising from the interconnection networks of parallel computers. These include trees, dags, series-parallel graphs, meshes, tori, hypercubes, cube-connected cycles, cube-connected… (More)

- Niall Graham, Frank Harary, Marilynn Livingston, Quentin F. Stout
- Inf. Comput.
- 1993

We consider the problem of determining the minimum number of faulty processors , n; m, and of faulty links, n; m, in an n-dimensional hypercube computer so that every m-dimensional subcube is faulty. Best known lower bounds for n; m and n; m are proved, several new recursive inequalities and new upper bounds are established, their asymptotic behavior for… (More)

One important aspect of efficient use of a hypercube computer to solve a given problem is the assignment of subtasks to processors in such a way that the communication overhead is low. The subtasks and their inter-communication requirements can be modeled by a graph, and the assignment of subtasks to processors viewed as an embedding of the task graph into… (More)

This paper examines the problem of locating and allocating large fault-free subsystems in multiuser massively parallel computer systems. Since the allocation schemes used in such large systems cannot allocate all possible subsystems a reduction in fault tolerance is experienced. We analyze the eeect of diierent allocation methods including the buddy and… (More)

- Kevin Glass, Marilynn Livingston, John S. Conery
- Workshop on Parallel and Distributed Simulation
- 1997

Large-scale ecological simulations are natural candidates for distributed discrete event simulation. In optimistic simulation of spatially explicit models, a difficult problem arises when individuals migrate between physical regions simulated by different logical processes. We present a solution to this problem that uses shared object states. Shared states… (More)

This paper examines the problem of locating large fault-free subcubes in multiuser hypercube systems. We analyze a new location strategy, the cyclic buddy system, and compare its performance to the buddy system, the gray-coded buddy system, and several variants of them. We show that the cyclic buddy system gives a striking improvement in expected fault… (More)

- Marilynn Livingston, Virginia Mary Lo, Daniel Zappala, Kurt J. Windisch
- Networked Group Communication
- 1999

We consider the problem of subsystem allocation in the mesh, torus, and hypercube multicomputers. Although the usual practice is to use a serial algorithm on the host processor to do the allocation, we show how the free and non-faulty processors can be used to perform the allocation in parallel. The algorithms we provide are dynamic, require very little… (More)

- Jens Mache, Virginia Mary Lo, Marilynn Livingston, Sharad Garg
- IOPADS
- 1999

Input/Output is a big obstacle to eeective use of teraaops-scale computing systems. Motivated by earlier parallel I/O measurements on an Intel TFLOPS machine, we conduct studies to determine the sensitivity of parallel I/O performance on multi-programmed mesh-connected machines with respect to number of I/O nodes, number of compute nodes, network link… (More)

Economics is the principle driver of current trends to use commodity components in the construction of parallel systems for a range of sizes. One objective is to enable the user to purchase a small system initially, and then extend it through a range of sizes as needs dictate. A desirable feature is to have good system performance through the range of… (More)

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