A simulation methodology for predicting the performance of sequential programs as well as data parallel (SPMD) programs on parallel and distributed platforms is presented. The proposed methodology comprises a paramete...
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A simulation methodology for predicting the performance of sequential programs as well as data parallel (SPMD) programs on parallel and distributed platforms is presented. The proposed methodology comprises a parameterised description of the applications as well as the target machines. An integrated simulation procedure estimates the time complexity of the (SPMD) application given a well-defined hardware platform and predicts the execution behaviour. The methodology has been actualised in terms of a toolset currently under development at the University of Amsterdam.
The Coupled Dipole method is used to simulate Elastic Light Scattering from arbitrary shaped particles. To facilitate simulation of relative large particles, such as human white blood cells, the number of dipoles requ...
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The Coupled Dipole method is used to simulate Elastic Light Scattering from arbitrary shaped particles. To facilitate simulation of relative large particles, such as human white blood cells, the number of dipoles required for the simulation is approximately 10(5) to 10(6). In order to carry out such simulations, very powerful computers are necessary. We have designed a parallel version of the Coupled Dipole method, and have implemented it on a distributed memory parallel computer, a Parsytec PowerXplorer, containing 32 Power PC-601 processors. The efficiency of the parallel implementation is investigated for simulations of model particles. Scattering by a sphere, modelled with 33552 dipoles, is simulated and compared with analytical Mie theory. Finally the suitability of the Coupled Dipole method to simulate Elastic Light Scattering from larger particles, such as white blood cells, is discussed.
In this paper we discuss a new approach to dynamic load balancing of parallel jobs in clusters of workstations and describe the implementation into a Unix run-time environment. The efficiency of the proposed methodolo...
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In this paper we discuss a new approach to dynamic load balancing of parallel jobs in clusters of workstations and describe the implementation into a Unix run-time environment. The efficiency of the proposed methodology is shown by means of a number of case studies.
作者：
KAANDORP, JAUniversity of Amsterdam
Parallel Scientific Computing and Simulation Group Faculty of Mathematics and Computer Science Kruislaan 403 1098 SJ Amsterdam The Netherlands
The growth forms of a series of samples of the sponge Haliclona oculata, collected along an environmental gradient, are compared to a series of three-dimensional simulated growth forms. In the series of three-dimensio...
The growth forms of a series of samples of the sponge Haliclona oculata, collected along an environmental gradient, are compared to a series of three-dimensional simulated growth forms. In the series of three-dimensional objects the environmental gradient is simulated by gradually changing a model parameter that represents the capabilities of the transport system by which nutrients are transported through the sponge tissue. Actual and simulated forms are compared by applying methods from mathematical morphology. (C) 1995 Academic Press Limited
The coupled-dipole method is widely used to calculate the light-scattering matrix S from arbitrary particles. An important parameter in the model is the size of the dipolar subunits. Usually a size of approximately 1/...
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The coupled-dipole method is widely used to calculate the light-scattering matrix S from arbitrary particles. An important parameter in the model is the size of the dipolar subunits. Usually a size of approximately 1/10 to approximately 1/20 of the wavelength of the incident light is sufficient for accurate calculations. However, it was noted that accurate S-34 calculations require much smaller dipolar subunits. We show that this conclusion is too pessimistic, by examining the sensitivity of the S-34 elements on surface roughness of spherical particles. Furthermore we give an example of an accurate S-34 calculation with dipolar subunits as large as 1/10 of the wavelength.
In this paper we discuss the concept of space-time diagrams as a representation of the execution of an application, and then give a method, based on critical path analysis, for calculating nontrivial upper bounds on t...
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In this paper we will formulate a framework for a parallel population based search process: an Abstract Cellular Genetic Algorithm (ACGA). Using the ACGA as a template, various parallel search algorithms can be formul...
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Employing the combination of a kernel with low computational complexity, implemented on powerful HPC systems, we are now able to push the limits of simulation of light scattering from arbitrary particles towards parti...
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We compare the Iserver-Occam, Parix, PVM, and Express parallel programming environments on a Parsytec GCel with 512 T805 transputers. The comparison will be made by a detailed analysis of the performance of one partic...
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