53,230 research outputs found

    Performance metrics for consolidated servers

    Get PDF
    In spite of the widespread adoption of virtualization and consol- idation, there exists no consensus with respect to how to bench- mark consolidated servers that run multiple guest VMs on the same physical hardware. For example, VMware proposes VMmark which basically computes the geometric mean of normalized throughput values across the VMs; Intel uses vConsolidate which reports a weighted arithmetic average of normalized throughput values. These benchmarking methodologies focus on total system through- put (i.e., across all VMs in the system), and do not take into account per-VM performance. We argue that a benchmarking methodology for consolidated servers should quantify both total system through- put and per-VM performance in order to provide a meaningful and precise performance characterization. We therefore present two performance metrics, Total Normalized Throughput (TNT) to characterize total system performance, and Average Normalized Reduced Throughput (ANRT) to characterize per-VM performance. We compare TNT and ANRT against VMmark using published performance numbers, and report several cases for which the VM- mark score is misleading. This is, VMmark says one platform yields better performance than another, however, TNT and ANRT show that both platforms represent different trade-offs in total system throughput versus per-VM performance. Or, even worse, in a cou- ple cases we observe that VMmark yields opposite conclusions than TNT and ANRT, i.e., VMmark says one system performs better than another one which is contradicted by TNT/ANRT performance characterization

    BPM, Agile, and Virtualization Combine to Create Effective Solutions

    Full text link
    The rate of change in business and government is accelerating. A number of techniques for addressing that change have emerged independently to provide for automated solutions in this environment. This paper will examine three of the most popular of these technologies-business process management, the agile software development movement, and infrastructure virtualization-to expose the commonalities in these approaches and how, when used together, their combined effect results in rapidly deployed, more successful solutions

    Uncovering the big players of the web

    Get PDF
    In this paper we aim at observing how today the Internet large organizations deliver web content to end users. Using one-week long data sets collected at three vantage points aggregating more than 30,000 Internet customers, we characterize the offered services precisely quantifying and comparing the performance of different players. Results show that today 65% of the web traffic is handled by the top 10 organiza- tions. We observe that, while all of them serve the same type of content, different server architectures have been adopted considering load bal- ancing schemes, servers number and location: some organizations handle thousands of servers with the closest being few milliseconds far away from the end user, while others manage few data centers. Despite this, the performance of bulk transfer rate offered to end users are typically good, but impairment can arise when content is not readily available at the server and has to be retrieved from the CDN back-en

    Control/structure interaction design methodology

    Get PDF
    The Control Structure Interaction Program is a technology development program for spacecraft that exhibit interactions between the control system and structural dynamics. The program objectives include development and verification of new design concepts (such as active structure) and new tools (such as a combined structure and control optimization algorithm) and their verification in ground and possibly flight test. The new CSI design methodology is centered around interdisciplinary engineers using new tools that closely integrate structures and controls. Verification is an important CSI theme and analysts will be closely integrated to the CSI Test Bed laboratory. Components, concepts, tools and algorithms will be developed and tested in the lab and in future Shuttle-based flight experiments. The design methodology is summarized in block diagrams depicting the evolution of a spacecraft design and descriptions of analytical capabilities used in the process. The multiyear JPL CSI implementation plan is described along with the essentials of several new tools. A distributed network of computation servers and workstations was designed that will provide a state-of-the-art development base for the CSI technologies

    Secure, performance-oriented data management for nanoCMOS electronics

    Get PDF
    The EPSRC pilot project Meeting the Design Challenges of nanoCMOS Electronics (nanoCMOS) is focused upon delivering a production level e-Infrastructure to meet the challenges facing the semiconductor industry in dealing with the next generation of ‘atomic-scale’ transistor devices. This scale means that previous assumptions on the uniformity of transistor devices in electronics circuit and systems design are no longer valid, and the industry as a whole must deal with variability throughout the design process. Infrastructures to tackle this problem must provide seamless access to very large HPC resources for computationally expensive simulation of statistic ensembles of microscopically varying physical devices, and manage the many hundreds of thousands of files and meta-data associated with these simulations. A key challenge in undertaking this is in protecting the intellectual property associated with the data, simulations and design process as a whole. In this paper we present the nanoCMOS infrastructure and outline an evaluation undertaken on the Storage Resource Broker (SRB) and the Andrew File System (AFS) considering in particular the extent that they meet the performance and security requirements of the nanoCMOS domain. We also describe how metadata management is supported and linked to simulations and results in a scalable and secure manner

    Adopting building information modeling (BIM) as collaboration platform in the design industry

    Get PDF
    This paper discusses the preliminary findings of an ongoing research project aimed at developing a technological, operational and strategic analysis of adopting BIM in AEC/FM (Architecture-Engineering-Construction/Facility Management) industry as a collaboration tool. Outcomes of the project will provide specifications and guidelines as well as establish industry standards for implementing BIM in practice. This research primarily focuses on BIM model servers as a collaboration platform, and hence the guidelines are aimed at enhancing collaboration capabilities. This paper reports on the findings from: (1) a critical review of latest BIM literature and commercial applications, and (2) workshops with focus groups on changing work-practice, role of technology, current perception and expectations of BIM. Layout for case studies being undertaken is presented. These findings provide a base to develop comprehensive software specifications and national guidelines for BIM with particular emphasis on BIM model servers as collaboration platforms
    corecore