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PlanetLab
PlanetLab was a group of computers available as a testbed for computer networking and distributed systems research. It was established in 2002 by Prof. Larry L. Peterson and Prof. David Culler, and as of June 2010, it was composed of 1090 nodes at 507 sites worldwide. Each research project had a "slice", or virtual machine access to a subset of the nodes. Accounts were limited to persons affiliated with corporations and universities that hosted PlanetLab nodes. However, a number of free, public services have been deployed on PlanetLab, including CoDeeN CoDeeN is a proxy server system created at Princeton University in 2003 and deployed for general use on PlanetLab. It operates as per the following: # Users set their internet caches to a nearby high bandwidth proxy that participates in the syst ..., the Coral Content Distribution Network, and Open DHT. Open DHT was taken down on 1 July 2009. PlanetLab was officially shut down in May 2020 but continues in Europe. References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Testbed
A testbed (also spelled test bed) is a platform for conducting rigorous, transparent, and replicable testing of scientific theories, computational tools, and new technologies. The term is used across many disciplines to describe experimental research and new product development platforms and environments. They may vary from hands-on prototype development in manufacturing industries such as automobiles (known as " mules"), aircraft engines or systems and to intellectual property refinement in such fields as computer software development shielded from the hazards of testing live. Software development In software development, testbedding is a method of testing a particular module (function, class, or library) in an isolated fashion. It may be used as a proof of concept or when a new module is tested apart from the program/system it will later be added to. A skeleton framework is implemented around the module so that the module behaves as if already part of the larger program. A t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
David Culler
David Ethan Culler (born November 12, 1959) is a computer scientist and former chair of the Department of Electrical Engineering and Computer Sciences at the University of California, Berkeley. He is a principal investigator in the Software Defined Buildings (SDB) project at the EECS Department at Berkeley and the faculty director of the i4Energy Center. His research addresses networks of small, embedded wireless devices, planetary-scale internet services, parallel computer architecture, parallel programming languages, and high performance communication. This includes TinyOS, Berkeley Motes, PlanetLab, Networks of Workstations (NOW), Internet services, Active Message, Split-C, and the Threaded Abstract Machine (TAM). Culler earned his B.A. at UC Berkeley and his Ph.D. at MIT. Culler was elected a member of the National Academy of Engineering in 2005 for contributions to scalable parallel processing systems, including architectures, operating systems, and programming environments ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CoDeeN
CoDeeN is a proxy server system created at Princeton University in 2003 and deployed for general use on PlanetLab. It operates as per the following: # Users set their internet caches to a nearby high bandwidth proxy that participates in the system. # Requests to that proxy are then forwarded to an appropriate member of the system that is in charge of the file (should be caching it) and that has sent recent updates showing that it is still alive. The file is forwarded to the proxy and thence to the client. What this means for normal users is that if they use this and a server is slow, however the content is cached on the system, then (after the first upload) requests to that file will be fast. It also means that the request will not be satisfied by the original server, equivalent to free bandwidth. For rare files this system could be slightly slower than downloading the file itself. The system's speed is also subject to the constraint of number of participating proxies. For ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Computer Networking
A computer network is a set of computers sharing resources located on or provided by network nodes. The computers use common communication protocols over digital interconnections to communicate with each other. These interconnections are made up of telecommunication network technologies, based on physically wired, optical, and wireless radio-frequency methods that may be arranged in a variety of network topologies. The nodes of a computer network can include personal computers, servers, networking hardware, or other specialised or general-purpose hosts. They are identified by network addresses, and may have hostnames. Hostnames serve as memorable labels for the nodes, rarely changed after initial assignment. Network addresses serve for locating and identifying the nodes by communication protocols such as the Internet Protocol. Computer networks may be classified by many criteria, including the transmission medium used to carry signals, bandwidth, communications protocols ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distributed Systems
A distributed system is a system whose components are located on different networked computers, which communicate and coordinate their actions by passing messages to one another from any system. Distributed computing is a field of computer science that studies distributed systems. The components of a distributed system interact with one another in order to achieve a common goal. Three significant challenges of distributed systems are: maintaining concurrency of components, overcoming the lack of a global clock, and managing the independent failure of components. When a component of one system fails, the entire system does not fail. Examples of distributed systems vary from SOA-based systems to massively multiplayer online games to peer-to-peer applications. A computer program that runs within a distributed system is called a distributed program, and ''distributed programming'' is the process of writing such programs. There are many different types of implementations for t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Larry L
Larry is a masculine given name in English, derived from Lawrence or Laurence. It can be a shortened form of those names. Larry may refer to the following: People Arts and entertainment * Larry D. Alexander, American artist/writer *Larry Boone, American country singer * Larry Collins, American musician, member of the rockabilly sibling duo The Collins Kids *Larry David (born 1947), Emmy-winning American actor, writer, comedian, producer and film director *Larry Emdur, Australian TV host *Larry Feign, American cartoonist working in Hong Kong *Larry Fine, of the Three Stooges * Larry Gates, American actor *Larry Gatlin, American country singer *Larry Gelbart (1928–2009), American screenwriter, playwright, director and author *Larry Graham, founder of American funk band Graham Central Station *Larry Hagman, American actor, best known for the TV series ''I Dream of Jeannie'' and ''Dallas'' *Larry Henley (1937–2014), American singer and songwriter, member of The Newbeats *Larry H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Node (networking)
In telecommunications networks, a node (, ‘knot’) is either a redistribution point or a communication endpoint. The definition of a node depends on the network and protocol layer referred to. A physical network node is an electronic device that is attached to a network, and is capable of creating, receiving, or transmitting information over a communication channel. A passive distribution point such as a distribution frame or patch panel is consequently not a node. Computer networks In data communication, a physical network node may either be data communication equipment (DCE) such as a modem, hub, bridge or switch; or data terminal equipment (DTE) such as a digital telephone handset, a printer or a host computer. If the network in question is a local area network (LAN) or wide area network (WAN), every LAN or WAN node that participates on the data link layer must have a network address, typically one for each network interface controller it possesses. Examples are compu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Virtual Machine
In computing, a virtual machine (VM) is the virtualization/emulation of a computer system. Virtual machines are based on computer architectures and provide functionality of a physical computer. Their implementations may involve specialized hardware, software, or a combination. Virtual machines differ and are organized by their function, shown here: * '' System virtual machines'' (also termed full virtualization VMs) provide a substitute for a real machine. They provide functionality needed to execute entire operating systems. A hypervisor uses native execution to share and manage hardware, allowing for multiple environments which are isolated from one another, yet exist on the same physical machine. Modern hypervisors use hardware-assisted virtualization, virtualization-specific hardware, primarily from the host CPUs. * Process virtual machines are designed to execute computer programs in a platform-independent environment. Some virtual machine emulators, such as QEMU and video ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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