| 1. |
- Brickner, R.G, et al.
(författare)
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QCD on the Connection Machine: Beyond-Lisp
- 1991
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Ingår i: Computer Physics Communications. - 0010-4655 .- 1879-2944. ; 65, s. 39-51
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Tidskriftsartikel (refereegranskat)abstract
- We report on the status of code development for a simulation of quantum chromodynamics (QCD) with dynamical Wilson fermions on the Connection Machine model CM-2. Our original code, written in * Lisp, gave performance in the near-GFLOPS range. We have rewritten the most time-consuming parts of the code in the low-level programming system CMIS, including the matrix multiply and the communication. Current versions of the code run at approximately 3.6 GFLOPS for the fermion matrix inversion, and we expect the next version to reach or exceed 5 GFLOPS.
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| 2. |
- Johan, Zdenek, et al.
(författare)
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An Efficient Communication Strategy for Finite Element Methods on the Connection Machine CM-5 System
- 1994
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Ingår i: Computer Methods in Applied Mechanics and Engineering. - 0045-7825 .- 1879-2138. ; 113:3-4, s. 363-387
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Tidskriftsartikel (refereegranskat)abstract
- The objective of this paper is to propose communication procedures suitable for unstructured finite element solvers implemented on distributed-memory parallel computers such as the Connection Machine CM-5 system. First, a data-parallel implementation of the recursive spectral bisection (RSB) algorithm proposed by Pothen et al. is presented. The RSB algorithm is associated with a node renumbering scheme which improves data locality of reference. Two-step gather and scatter operations taking advantage of this data locality are then designed. These communication primitives make use of the indirect addressing capability of the CM-5 vector units to achieve high gather and scatter bandwidths. The performance of the proposed communication strategy is illustrated on large-scale three-dimensional fluid dynamics problems
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| 3. |
- Johan, Zdenek, et al.
(författare)
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Scalability of Finite Element Applications on Distributed–Memory Parallel Computers
- 1994
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Ingår i: Computer Methods in Applied Mechanics and Engineering. - 0045-7825 .- 1879-2138. ; 119:1-2, s. 61-72
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Tidskriftsartikel (refereegranskat)abstract
- This paper demonstrates that scalability and competitive efficiency can be achieved for unstructured grid finite element applications on distributed memory machines, such as the Connection Machine CM-5 system. The efficiency of finite element solvers is analyzed through two applications: an implicit computational aerodynamics application and an explicit solid mechanics application. Scalability of mesh decomposition and of data mapping strategies is also discussed. Numerical examples that support the claims for problems with an excess of fourteen million variables are presented.
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| 4. |
- Johnsson, R., et al.
(författare)
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Autogenic bone paste in posterolateral fusion of the lower lumbar spine
- 1990
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Ingår i: Journal of Orthopaedic Surgical Techniques. - 0334-0236. ; 5:1, s. 19-25
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Tidskriftsartikel (refereegranskat)abstract
- In order to facilitate bone graft harvesting and to get more mouldable bone graft in posterolateral fusions of the lower lumbar spine, a modified technique of bone graft harvesting was utilized. Through a midline skin incision the most posterolateral part of an iliac crest was ground with a reamer to a smooth bone paste. The technique was used in lumbar posterolateral fusions without osteosynthesis in 13 patients with no previous spinal surgery and with spondylolysis-olisthesis grade 1-4 or lumbar disc disorder/facet joint arthrosis. Conventional radiography 6-9 months after surgery demonstrated good osseous consolidation of the fusion in 11 patients. There was no postoperative infection and the patients profited from having only 1 scar instead of 2 or 3.
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| 5. |
- Mathur, K, et al.
(författare)
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Massively Parallel Computing: Unstructured Finite Element Simulations
- 1993
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Ingår i: NAFEMS. ; , s. 24-29
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Konferensbidrag (refereegranskat)abstract
- Massively parallel computing holds the promise of extreme performance. Critical for achieving high performance is the ability to exploit locality of reference and effective management of the communication resources. This article describes two communication primitives and associated mapping strategies that have been used for several different unstructured, three-dimensional, finite element applications in computational fluid dynamics and structural mechanics.
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| 6. |
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| 7. |
- Zdenek, Johan, et al.
(författare)
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Data Parallel Finite Element Techniques for Computational Fluid Dynamics on the Connection Machine Systems
- 1993
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Ingår i: <em>Parallel Computational Fluid Dynamics </em>. - : North Holland. ; , s. 215-229
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Bokkapitel (refereegranskat)abstract
- A finite element method for computational fluid dynamics has been implemented on the Connection Machine systems CM-2 and CM-200. An implicit iterative solution strategy, based on the preconditioned matrix-free GMRES algorithm, is employed. Parallel data structures built on both nodal and elemental sets are used to achieve maximum parallelization. Communication primitives provided through the Connection Machine Scientific Software Library substantially improved the overall performance of the program. Computations of three-dimensional compressible flows using unstructured meshes having close to one million elements, such as a complete airplane, demonstrate that the Connection Machine systems are suitable for these applications. Performance comparisons are also carried out with the vector computers Cray Y-MP and Convex C-1. ii Contents Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. T...
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| 8. |
- Zdenek, Johan, et al.
(författare)
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Mesh Decomposition and Communication Procedures for Finite Element Applications on the Connection Machine CM–5 System
- 1994. - 2
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Ingår i: <em>High–Performance Computing and Networking</em>. - : Springer-Verlag New York. ; , s. 233-240
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Bokkapitel (refereegranskat)abstract
- The objective of this paper is to analyze the impact of data mapping strategies on the performance of finite element applications. First, we describe a parallel mesh decomposition algorithm based on recursive spectral bisection used to partition the mesh into element blocks. A simple heuristic algorithm then renumbers the mesh nodes. Large three-dimensional meshes demonstrate the efficiency of those mapping strategies and assess the performance of a finite element program for fluid dynamics.
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