An approach aimed at running a special class of computationally intensive applications in an affordable heterogeneous computing environment built around existing off-the-shelf hardware is described. the software suppo...
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An approach aimed at running a special class of computationally intensive applications in an affordable heterogeneous computing environment built around existing off-the-shelf hardware is described. the software support combines a general-purpose parallel programming language with a remote procedure call facility. the increase in throughput is a result of the overlap in servers computations. the attractiveness of the system comes mainly from its low cost. A typical application involving the traveling salesman problem is described, and performance issues are discussed.
We present a new parallel implementation of explicit time stepping methods for time dependent equations in one or two spatial dimensions. the aim is to minimize the number of data transfers, to get faster algorthms. I...
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An optimistic scheme, called ODL, that uses dummy locks to test the validity of a transaction for concurrency control in distributed database systems is suggested. the dummy locks are long-term locks;however, they do ...
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An optimistic scheme, called ODL, that uses dummy locks to test the validity of a transaction for concurrency control in distributed database systems is suggested. the dummy locks are long-term locks;however, they do not conflict with any other lock. By the use of long-term dummy locks, the need for the information about the write sets of validated transactions is eliminated, and during the validation test only the related sites are checked. Also, the transactions to be aborted are immediately recognized before the validation test, and therefore the cost of restarts is reduced. the usual read and write locks are used as short-term locks during the validation test. this use of short-term locks eliminates the need for the systemwide critical section and results in a distributed and parallel validation test.
this paper describes a system tool designed for debugging the interprocess communication of a imssagepassing parallel program. the tool includes an nteractive environment that helps the user generate a graphical displ...
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In conjunction withthe development of a test bed for finite element approaches for solving three-dimensional electromagnetic scattering problems on the JPL/Caltech Mark IIIfp Hypercube, we have developed guidelines f...
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the digital halftone resolution problem may be stated as follows: given an n 5; n array V of real numbers, vi,j ϵ [0,1], produce an n 5; n array w of binary integers, wi,j ϵ { O , l } , such that w, when displ...
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Multigrid is a fast iterative method used to solve linear partial differential equations. However, because the solution of very small problems is inherent in the multigrid iteration, it is difficult to implement effic...
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the Fokker-Planck package FPPAC [1,2], which solves the complete nonlinear multispecies Fokker- Planck collision operator for a plasma in twodimensional velocity space, has been rewritten for the Connection Machine 2....
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this research investigated the effects of computer system architecture and simulation model decomposition strategies on the performance of parallel time-driven simulations. A Ballistic Missile Defense (BMD) timedriven...
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there is often a trade-off between preserving sparsity and numerical stability in sparse matrix factorizations. In applications like the direct solution of Equality Constrained Least Squares problem, the accurate dete...
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