Topic
Emulation
About: Emulation is a research topic. Over the lifetime, 8149 publications have been published within this topic receiving 96451 citations.
Papers published on a yearly basis
Papers
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10 Apr 2005
TL;DR: QEMU supports full system emulation in which a complete and unmodified operating system is run in a virtual machine and Linux user mode emulation where a Linux process compiled for one target CPU can be run on another CPU.
Abstract: We present the internals of QEMU, a fast machine emulator using an original portable dynamic translator. It emulates several CPUs (x86, PowerPC, ARM and Sparc) on several hosts (x86, PowerPC, ARM, Sparc, Alpha and MIPS). QEMU supports full system emulation in which a complete and unmodified operating system is run in a virtual machine and Linux user mode emulation where a Linux process compiled for one target CPU can be run on another CPU.
2,420 citations
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09 Dec 2002TL;DR: The overall design and implementation of Netbed is presented and its ability to improve experimental automation and efficiency is demonstrated, leading to new methods of experimentation, including automated parameter-space studies within emulation and straightforward comparisons of simulated, emulated, and wide-area scenarios.
Abstract: Three experimental environments traditionally support network and distributed systems research: network emulators, network simulators, and live networks. The continued use of multiple approaches highlights both the value and inadequacy of each. Netbed, a descendant of Emulab, provides an experimentation facility that integrates these approaches, allowing researchers to configure and access networks composed of emulated, simulated, and wide-area nodes and links. Netbed's primary goals are ease of use, control, and realism, achieved through consistent use of virtualization and abstraction.By providing operating system-like services, such as resource allocation and scheduling, and by virtualizing heterogeneous resources, Netbed acts as a virtual machine for network experimentation. This paper presents Netbed's overall design and implementation and demonstrates its ability to improve experimental automation and efficiency. These, in turn, lead to new methods of experimentation, including automated parameter-space studies within emulation and straightforward comparisons of simulated, emulated, and wide-area scenarios.
1,398 citations
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01 May 1994TL;DR: A tool called Shade is described which combines efficient instruction-set simulation with a flexible, extensible trace generation capability and discusses instruction set emulation in general.
Abstract: Tracing tools are used widely to help analyze, design, and tune both hardware and software systems. This paper describes a tool called Shade which combines efficient instruction-set simulation with a flexible, extensible trace generation capability. Efficiency is achieved by dynamically compiling and caching code to simulate and trace the application program. The user may control the extent of tracing in a variety of ways; arbitrarily detailed application state information may be collected during the simulation, but tracing less translates directly into greater efficiency. Current Shade implementations run on SPARC systems and simulate the SPARC (Versions 8 and 9) and MIPS I instruction sets. This paper describes the capabilities, design, implementation, and performance of Shade, and discusses instruction set emulation in general.
745 citations
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30 Aug 2010TL;DR: This work proposes a hybrid packet and circuit switched data center network architecture (or HyPaC) which augments the traditional hierarchy of packet switches with a high speed, low complexity, rack-to-rack optical circuit-switched network to supply high bandwidth to applications.
Abstract: Data-intensive applications that operate on large volumes of data have motivated a fresh look at the design of data center networks. The first wave of proposals focused on designing pure packet-switched networks that provide full bisection bandwidth. However, these proposals significantly increase network complexity in terms of the number of links and switches required and the restricted rules to wire them up. On the other hand, optical circuit switching technology holds a very large bandwidth advantage over packet switching technology. This fact motivates us to explore how optical circuit switching technology could benefit a data center network. In particular, we propose a hybrid packet and circuit switched data center network architecture (or HyPaC for short) which augments the traditional hierarchy of packet switches with a high speed, low complexity, rack-to-rack optical circuit-switched network to supply high bandwidth to applications. We discuss the fundamental requirements of this hybrid architecture and their design options. To demonstrate the potential benefits of the hybrid architecture, we have built a prototype system called c-Through. c-Through represents a design point where the responsibility for traffic demand estimation and traffic demultiplexing resides in end hosts, making it compatible with existing packet switches. Our emulation experiments show that the hybrid architecture can provide large benefits to unmodified popular data center applications at a modest scale. Furthermore, our experimental experience provides useful insights on the applicability of the hybrid architecture across a range of deployment scenarios.
680 citations
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15 Mar 2010TL;DR: BonnMotion is an open-source Java software which creates and analyzes mobility scenarios and serves as a tool for the investigation of mobile multi-hop network scenario characteristics.
Abstract: Simulation and emulation are techniques frequently used for performance evaluation of wireless multi-hop networks. If the wireless devices are mobile, the movement patterns of these objects are found to have significant impact on the simulation and emulation results. This is quite obvious as the movements influence the topology of the network.In this paper we describe and present BonnMotion. BonnMotion is an open-source Java software which creates and analyzes mobility scenarios. It has been developed at the University of Bonn, Germany, where it serves as a tool for the investigation of mobile multi-hop network scenario characteristics. The scenarios can also be exported for the network simulators ns-2, GloMoSim/QualNet, COOJA, and MiXiM.
583 citations