15679317
Using Performance Modeling to Design Large-Scale Systems
A methodology for accurately modeling large applications explores the performance of ultrascale systems at different stages in their life cycle, from early design through production use.
14275613
An empirical performance analysis of commodity memories in commodity servers
This work details a performance study of six different types of commodity memories in two commodity server nodes. A number of micro-benchmarks are used that measure low-level performance characteristics, as well as two applications representative of the ASC workload. The memories vary both in terms of performance, including latency and bandwidths, and in terms of their physical properties and manufacturer. The two server nodes analyzed were an Itanium-II Madison based system, and a Xeon based system. All memories can be used within both of these processing nodes. This allows the performance of the memories to be directly examined while keeping all other factors within a node the same (processor, motherboard, operating system etc.). The results of this study show that there can be a significant difference in application performance depending on the actual memory used - by as much as 20%. The achieved performance is a result of the integration of the memory into the node as well as how the applications actually utilize it.
6040707
A Performance and Scalability Analysis of the BlueGene/L Architecture
Based on a set of measurements done on the 512-node 500MHz prototype and early results on a 2048 node 700MHz BlueGene/L machine at IBM Watson, we present a performance and scalability analysis of the architecture from low-level characteristics to large-scale applications. In addition, we present predictions using our models for the performance of two representative applications from the ASC² workload on the full BlueGene/L configuration of 64K nodes. We have compared the measured values for several of the benchmarks in our suite against the predicted numbers from our performance models. In general, the error bars were relatively low. A comparison between the performance of BlueGene/L and the ASCI Q, the largest supercomputer in the US, is presented, also based on our predictive performance models.
53225813
Architecture - A performance comparison through benchmarking and modeling of three leading supercomputers: blue Gene/L, Red Storm, and Purple
15721477
Implementation and performance modeling of deterministic particle transport (Sweep3D) on the IBM Cell/B.E
The IBM Cell Broadband Engine (BE) is a novel multi-core chip with the potential for the demanding floating point performance that is required for high-fidelity scientific simulations. However, data movement within the chip can be a major challenge to realizing the benefits of the peak floating point rates. In this paper, we present the results of implementing Sweep3D on the Cell/B.E. using an intra-chip message passing model that minimizes data movement. We compare the advantages/disadvantages of this programming model with a previous implementation using a master–worker threading strategy. We apply a previously validated micro-architecture performance model for the application executing on the Cell/B.E. (based on our previous work in Monte Carlo performance models), that predicts overall CPI (cycles per instruction), and gives a detailed breakdown of processor stalls. Finally, we use the micro-architecture model to assess the performance of future design parameters for the Cell/B.E. micro-architecture. The methodologies and results have broader implications that extend to multi-core architectures.
15327323
A comparison of 'traditional' and multimedia information systems development practices
Abstract As multimedia information systems begin to infiltrate organizations, there arises a need to capture and disseminate knowledge about how to develop them. Little is thus far known about the realities of multimedia systems development practice, or about how the development of multimedia systems compares to that of ‘traditional’ information systems. Herein are discussed the findings of a survey of multimedia developers in Ireland. Practitioners generally agree that systematic approaches are desirable in order to beneficially add structure to development processes, but they are predominantly using their own in-house methods rather than those prescribed in the literature.
9385354
The Hugin Tool for Learning Bayesian Networks
In this paper, we describe the Hugin Tool as an efficient tool for knowledge discovery through construction of Bayesian networks by fusion of data and domain expert knowledge. The Hugin Tool supports structural learning, parameter estimation, and adaptation of parameters in Bayesian networks. The performance of the Hugin Tool is illustrated using real-world Bayesian networks, commonly used examples from the literature, and randomly generated Bayesian networks.
6168223
A Survey of Multimedia and Web Development Techniques and Methodology Usage
The authors present survey results which suggest that no uniform approach exists for multimedia systems development and that practitioners are not using the multimedia models cited in the literature. It is concluded that developers need new techniques that capture requirements and integrate them within a systems development framework.
11269210
A Tool to Support Collaborative Software Requirements Management
The system requirements specification (SRS) is a highly dynamic document that grows and evolves throughout a software development project, and it is critical that it be carefully engineered and managed. Because the SRS fulfils many roles and is of interest to a diversity of stakeholders, its management should be a collaborative process supported by an automated tool. Commercial requirements management tools are at present insufficiently versatile to support collaboration between a multidisciplinary and potentially distributed team of stakeholders. The requirements for such a collaborative tool are herein presented, alongside the design of a prototype and the findings of its application in a case study.
18252922
Hypermedia systems development practices: a survey
Merely calling a system "Web-based" doesn't necessarily imply that its software design differs much from that of a traditional system. When Web-based systems assume hypermedia functionality they become substantively different from a design perspective. Hypermedia technologies support much richer user interfaces, more complex navigation mechanisms, and more varied forms of information than traditional computer systems. In recent years, hypermedia systems (particularly Web-based ones) have grown in complexity and scope as they've begun to involve critical organizational activities such as customer support, sales and marketing, and technical support.