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Amdahl's Law
In computer architecture, Amdahl's law (or Amdahl's argument) is a formula that shows how much faster a task can be completed when more resources are added to the system. The law can be stated as: "the overall performance improvement gained by optimizing a single part of a system is limited by the fraction of time that the improved part is actually used". It is named after computer scientist Gene Amdahl, and was presented at the American Federation of Information Processing Societies (AFIPS) Spring Joint Computer Conference in 1967. Amdahl's law is often used in parallel computing to predict the theoretical speedup when using multiple processors. Definition In the context of Amdahl's law, speedup can be defined as: \text = \frac or \text = \frac Amdahl's law can be formulated in the following way: : \text_\text = \frac where * \text_\text represents the total speedup of a program * \text_ represents the proportion of time spent on the portion of the code where improve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neil J
Neil is a masculine name of Irish origin. The name is an anglicisation of the Irish '' Niall'' which is of disputed derivation. The Irish name may be derived from words meaning "cloud", "passionate", "victory", "honour" or "champion".. As a surname, Neil is traced back to Niall of the Nine Hostages Niall Noígíallach (; Old Irish "having nine hostages"), or Niall of the Nine Hostages, was a legendary, semi-historical Irish king who was the ancestor of the Uí Néill dynasties that dominated Ireland from the 6th to the 10th centuries. ... who was an Irish king and eponymous ancestor of the Uí Néill and MacNeil kindred. Most authorities cite the meaning of Neil in the context of a surname as meaning "champion". Origins The Gaelic name was adopted by the Vikings and taken to Iceland as ''Njáll'' (see Nigel). From Iceland it went via Norway, Denmark, and Normandy to England. The name also entered Northern England and Yorkshire directly from Ireland, and from Norwegian sett ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Computer Sciences Corporation
Computer Sciences Corporation (CSC) was an American multinational corporation that provided information technology (IT) services and professional services. On April 3, 2017, it merged with the Enterprise Services line of business of HP Enterprise (formerly Electronic Data Systems) to create DXC Technology. History CSC was founded in April 1959 in Los Angeles, California, by Roy Nutt and Fletcher Jones. CSC initially provided programming tools such as assembler and compiler software. In the 1960s, CSC provided software programming services to major computer manufacturers like IBM and Honeywell and secured their first contracts for the U.S. public sector with NASA (among others). By 1963, CSC became the largest software company in the United States and the first software company to be listed on the American Stock Exchange. By the end of 1968, CSC was listed on the New York Stock Exchange and had operations in Canada, India, the United Kingdom, Germany, Spain, Italy, B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aeronutronic
Aeronutronic was a defense related division of Ford Aerospace, owned by Ford Motor Company, and based in Newport Beach, Orange County, California. The Engineering and Research Center campus was located on Jamboree Road at Ford Road, overlooking Balboa Bay and the Santa Catalina Strait of the Pacific Ocean in Newport Beach.Los Angeles Times.com: "Ford Aerospace Treated for Years Like a Stepchild : Defense: The auto maker has announced plans to sell its Newport Beach-based unit. But critics say the firm was abandoned long ago." 14 January 1990. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TRW Inc
TRW Inc. was an American corporation involved in a variety of businesses, mainly aerospace, electronics, automotive, and credit reporting.http://www.fundinguniverse.com/company-histories/TRW-Inc-Company-History.html TRW Inc. It was a pioneer in multiple fields including electronic components, integrated circuits, computers, software and systems engineering. TRW built many spacecraft, including Pioneer 1, Pioneer 10, and several space-based observatories. It was #57 on the 1986 Fortune 500 list, and had 122,258 employees. The company was called Thompson Ramo Wooldridge Inc., after the 1958 merger of the Ramo-Wooldridge Corporation and Thompson Products. This was later shortened to TRW. The company was founded in 1901 and lasted for just over a century until being acquired by Northrop Grumman in 2002. It spawned a variety of corporations, including Pacific Semiconductors, The Aerospace Corporation, Bunker-Ramo and Experian. Its automotive businesses were sold off by Northro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nathaniel Rochester (computer Scientist)
Nathaniel Rochester (January 14, 1919 – June 8, 2001) was the chief architect of the IBM 701, the first mass produced scientific computer, and of the prototype of its first commercial version, the IBM 702. He wrote the first assembler and participated in the founding of the field of artificial intelligence. Early work Rochester received his B.S. degree in electrical engineering from the Massachusetts Institute of Technology in 1941. He stayed on at MIT in the Radiation Laboratory for three years and then moved to Sylvania Electric Products where he was responsible for the design and construction of radar sets and other military equipment. His group built the arithmetic element for the Whirlwind I computer at MIT. IBM 701 computer In 1948, Rochester moved to IBM, where he co-designed, along with Jerrier Haddad, the first mass-produced scientific computer, the IBM 701. He wrote the first symbolic assembler, which allowed programs to be written in short, readable co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IBM 704
The IBM 704 is the model name of a large digital computer, digital mainframe computer introduced by IBM in 1954. Designed by John Backus and Gene Amdahl, it was the first mass-produced computer with hardware for floating-point arithmetic. The IBM 704 ''Manual of operation'' states: The type 704 Electronic Data-Processing Machine is a large-scale, high-speed electronic calculator controlled by an internally stored program of the single address type. The 704 at that time was thus regarded as "pretty much the only computer that could handle complex math". The 704 was a significant improvement over the earlier IBM 701 in terms of architecture and implementation. Like the 701, the 704 used vacuum-tube logic circuitry, but increased the instruction size from 18-bit computing, 18 bits to 36-bit computing, 36 bits, the same as the memory's word size. Changes from the 701 include the use of magnetic-core memory instead of Williams tubes, floating-point arithmetic instructions, 15 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IBM 701
The IBM 701 Electronic Data Processing Machine, known as the Defense Calculator while in development, was IBM’s first commercial scientific computer and its first series production mainframe computer, which was announced to the public on May 21, 1952. It was designed and developed by Jerrier Haddad and Nathaniel Rochester and was based on the IAS machine at Princeton. The IBM 701 was the first computer in the IBM 700/7000 series, which were IBM’s high-end computers until the arrival of the IBM System/360 in 1964. The business-oriented sibling of the 701 was the IBM 702 and a lower-cost general-purpose sibling was the IBM 650, which gained fame as the first mass-produced computer. History IBM 701 competed with Remington Rand's UNIVAC 1103 in the scientific computation market. In early 1954, a committee of the Joint Chiefs of Staff requested that the two machines be compared for the purpose of using them for a Joint Numerical Weather Prediction project. Based on the t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IBM Stretch
The IBM 7030, also known as Stretch, was IBM's first transistorized supercomputer. It was the fastest computer in the world from 1961 until the first CDC 6600 became operational in 1964."Designed by Seymour Cray, the CDC 6600 was almost three times faster than the next fastest machine of its day, the IBM 7030 Stretch." Originally designed to meet a requirement formulated by Edward Teller at Lawrence Livermore National Laboratory, the first example was delivered to Los Alamos National Laboratory in 1961, and a second customized version, the IBM 7950 Harvest, to the National Security Agency in 1962. The Stretch at the Atomic Weapons Research Establishment at Aldermaston, England was heavily used by researchers there and at AERE Harwell, but only after the development of the S2 Fortran compiler which was the first to add dynamic arrays, and which was later ported to the Ferranti Atlas of Atlas Computer Laboratory at Chilton. The 7030 was much slower than expected and faile ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wisconsin Integrally Synchronized Computer
The Wisconsin Integrally Synchronized Computer (WISC) was an early digital computer designed and built at the University of Wisconsin–Madison. Operational in 1954, it was the first digital computer in the state. Pioneering computer designer Gene Amdahl drafted the WISC's design as his PhD thesis. The computer was built over the period 1951-1954. It had 1,024 50-bit words (equivalent to about 6 KB) of drum memory, with an operation time of 1/15 second and throughput of 60 operations per second, which was achieved by an early form of instruction pipeline. It was capable of both fixed and floating point operation. It weighed about . The WISC is part of the permanent collection of the Computer History Museum. References External linksOral history interview with Gene M. Amdahl.Charles Babbage Institute, University of Minnesota, Minneapolis. Amdahl starts by describing his early life and education, recalling his experiences teaching in the Advanced Specialized Training Program dur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Babbage Institute
The IT History Society (ITHS) is an organization that supports the history and scholarship of information technology by encouraging, fostering, and facilitating archival and historical research. Formerly known as the Charles Babbage Foundation, it advises historians, promotes collaboration among academic organizations and museums, and assists IT corporations in preparing and archiving their histories for future studies. Activities The IT History Society provides background information to those with an interest in the history of Information Technology, including papers that provide advice on how to perform historical work and how historical activities can benefit private sector organizations. It tracks historical projects seeking funding as well as projects underway and completed. It maintains online, publicly available, lists of events pertaining to IT history, IT history resources, an IT Honor Roll acknowledging more than 700 individuals who have made a noteworthy contribution ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Eponymous Laws
This list of eponymous laws provides links to articles on laws, principles, adages, and other succinct observations or predictions named after a person. In some cases the person named has coined the law – such as Parkinson's law. In others, the work or publications of the individual have led to the law being so named – as is the case with Moore's law. There are also laws ascribed to individuals by others, such as Murphy's law; or given eponymous names despite the absence of the named person. Named laws range from significant scientific laws such as Newton's laws of motion, to humorous examples such as Murphy's law. A–B * Acton's dictum: "Power tends to corrupt, and absolute power corrupts absolutely. Great men are almost always bad men .. * Aitken's law describes how vowel length in Scots and Scottish English is conditioned by environment. Named for Professor A. J. Aitken, who formulated it. * Alder's razor: See Newton's flaming laser sword below. * Allen's rule ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
