We describe a model for an interdisciplinary course in scientific modeling and simulation. We discuss the course structure and content, as well as the results of our evaluation process.
ISBN:
(纸本)0769522947
We describe a model for an interdisciplinary course in scientific modeling and simulation. We discuss the course structure and content, as well as the results of our evaluation process.
We investigate conservative parallel discrete event simulations for logical circuits on shared-memory multiprocessors. For a first estimation of the possible speedup, we extend the critical path analysis technique by ...
详细信息
We investigate conservative parallel discrete event simulations for logical circuits on shared-memory multiprocessors. For a first estimation of the possible speedup, we extend the critical path analysis technique by partitioning strategies. To incorporate overhead due to the management of data structures, we use a simulation on an ideal parallel machine (PRAM). This simulation can be directly executed on the SB-PRAM prototype, yielding both an implementation and a basis for data structure optimizations. One of the major tools to achieve these is the SB-PRAM's hardware support for parallel prefix operations. Our reimplementation of the PTHOR program on the SB-PRAM yields substantially higher speedups than before.
Maya is a simulation platform for evaluating the performance of parallel programs on parallel architectures. It allows the rapid prototyping of memory protocols with varying degrees of coherence and facilitates the st...
详细信息
ISBN:
(纸本)1565550277
Maya is a simulation platform for evaluating the performance of parallel programs on parallel architectures. It allows the rapid prototyping of memory protocols with varying degrees of coherence and facilitates the study of the impact of these protocols on application programs. The design of Maya and its simulation mechanism are discussed. Performance results on architectural simulation with different memory coherence protocols are presented. parallel discrete event simulation techniques are adopted for the executiondriven simulation of parallel architectures.
Most experimental studies of the performance of parallelsimulation protocols use speedup or number of events processed per unit time as the performance metric. Although helpful in evaluating the usefulness of paralle...
详细信息
Most experimental studies of the performance of parallelsimulation protocols use speedup or number of events processed per unit time as the performance metric. Although helpful in evaluating the usefulness of parallelsimulation for a given simulation model, these metrics tell us little about the efficiency of the simulation protocol used. In this paper, we describe an Ideal simulation Protocol (ISP), based on the concept of critical path, which experimentally computes the best possible execution time for a simulation model on a given parallel architecture. Since ISP computes the bound by actually executing the model on the given parallel architecture, it is much more realistic than that computed by a uniprocessor critical path analysis. The paper illustrates, using parameterized synthetic benchmarks, how an ISP-based performance evaluation can lead to much better insights into the performance of parallelsimulation protocols than what would be gained from speedup graphs alone.
In this paper an approach to provide Web-based framework for distributed execution of collaborative applications is presented. The work is a part of a wider on-going project whose aim is to make environmental simulati...
详细信息
ISBN:
(纸本)0818680431
In this paper an approach to provide Web-based framework for distributed execution of collaborative applications is presented. The work is a part of a wider on-going project whose aim is to make environmental simulation models publicly available to the Internet users. The Web computing skeleton has been constructed from prefabricated Web-enabled components with the ability to open and maintain Web connections and provide collaboration over the Internet. The case study illustrates how a single-user simulation system can be embedded in the skeleton, thus becoming widely available distributed application.
Models of ATM communication systems were simulated on massively parallel SIMD computer. Fast simulations of ATM models are needed because the regimes of interest usually involve high volumes of traffic and low failure...
详细信息
Models of ATM communication systems were simulated on massively parallel SIMD computer. Fast simulations of ATM models are needed because the regimes of interest usually involve high volumes of traffic and low failure rates. Unexpected practical and theoretical difficulties, partly due to the massive parallelism and SIMD aspects, were encountered;this paper shows how to cope with them. In a replica-parallelsimulation of an ATM system, large variations in computed statistics are caused by small differences in the distribution of employed random number generators. A comparison of these distributions using a secondary statistical measure served to disambiguate the results.
Performance of Time Warp simulation systems are often measured on exclusively available parallel computing resources. In distributed systems exclusive use is normally not feasible. Instead, due to the multi-tasking op...
详细信息
Performance of Time Warp simulation systems are often measured on exclusively available parallel computing resources. In distributed systems exclusive use is normally not feasible. Instead, due to the multi-tasking operating systems, many users share the workstations and their availability for parallelsimulation purposes varies extensively. Time Warp has been found to be very sensitive to variations in available processing power. This paper presents two methods for a Time Warp VLSI simulation system to reduce the negative effect of a non-ideal environment on the execution of parallelsimulations. A dynamic load balancing algorithm which adapts to the change of available processing power is presented. This mechanism, together with a multi-cluster partitioning technique significantly improves the performance of Time Warp based simulation systems on heterogeneous computing resources.
The partitioning of systems for parallelsimulation is a complex task, requiring consideration of both computational load requirements and communications activity. Typically, this information is not accurately known p...
详细信息
The partitioning of systems for parallelsimulation is a complex task, requiring consideration of both computational load requirements and communications activity. Typically, this information is not accurately known prior to execution. This paper investigates the use of historical information for the prediction of future requirements, both for computation and communications. In addition, for optimistic simulation algorithms, we present a novel technique (which we call predictive optimism) whereby binary prediction schemes can be used to increase the accuracy of optimistic assumptions, thereby decreasing rollbacks and potentially improving overall simulator performance.
Data Distribution Management (DDM) is a High Level Architecture/Run-time Infrastructure (HLA/RTI) service that manages the distribution of state updates and interaction information in large scale distributed simulatio...
详细信息
ISBN:
(纸本)0769513484
Data Distribution Management (DDM) is a High Level Architecture/Run-time Infrastructure (HLA/RTI) service that manages the distribution of state updates and interaction information in large scale distributedsimulations, limits and controls the volume of data exchanged during the simulation. In this paper we focus upon the following three DDM schemes: Region-Based, Fixed and Dynamic Grid-Based techniques. In an effort to determine the most efficient model for applying the DDM service, we developed a mini-RTY Kit framework and propose a set of benchmarks to compare these DDM schemes. Using the RTI Kit, we performed extensive simulation experiments and present our analysis of the results of numerous federation executions.
暂无评论