Swap Fairness for Thrashing Mitigation

International audienceThe swap mechanis mallows an operating system to work with more memory than available RAM space, by temporarily flushing some data to disk. However, the system sometimes ends up spending more time swapping data in and out of disk than performing actual computation. This state is called thrashing. Classical strategies against thrashing rely on reducing system load, so as to decrease memory pressure and increase global throughput. Those approaches may however be counterproductive when tricked into advantaging malicious or long-standing processes. This is particularily true in the context of shared hosting or virtualization, where multiple users run uncoordinated and selfish workloads. To address this challenge, we propose an accounting layer that forces swap fairness among processes competing for main memory. It ensures that a process cannot monopolize the swap subsystem by delaying the swap operations of abusive processes, reducing the number of system-wide page faults while maximizing memory utilization

Implementation of the page fault frequency replacement algorithm.

This paper investigates the implementation of the page fault frequency (PFF) replacement algorithm as the mechanism for selecting and replacing pages of programs loaded into the main memory of a multiprocessing, multiprogrammed computer system. The frequency at which an executing program requires a page of virtual memory, the PFF, provides a basis for judging the real memory requirements of the program. Operating difficulties of PFF that reduce its usefulness in a time-shared computer system (Michigan Terminal System) are discussed, and a means of implementing the algorithm is proposed.http://archive.org/details/implementationof00lancCaptain, United States Marine CorpsApproved for public release; distribution is unlimited

Computing and data processing

The applications of computers and data processing to astronomy are discussed. Among the topics covered are the emerging national information infrastructure, workstations and supercomputers, supertelescopes, digital astronomy, astrophysics in a numerical laboratory, community software, archiving of ground-based observations, dynamical simulations of complex systems, plasma astrophysics, and the remote control of fourth dimension supercomputers

Fifth Conference on Artificial Intelligence for Space Applications

The Fifth Conference on Artificial Intelligence for Space Applications brings together diverse technical and scientific work in order to help those who employ AI methods in space applications to identify common goals and to address issues of general interest in the AI community. Topics include the following: automation for Space Station; intelligent control, testing, and fault diagnosis; robotics and vision; planning and scheduling; simulation, modeling, and tutoring; development tools and automatic programming; knowledge representation and acquisition; and knowledge base/data base integration

Comparison of the vocabularies of the Gregg shorthand dictionary and Horn-Peterson's basic vocabulary of business letters

This study is a comparative analysis of the vocabularies of Horn and Peterson's The Basic Vocabulary of Business Letters1 and the Gregg Shorthand Dictionary.2 Both books purport to present a list of words most frequently encountered by stenographers and students of shorthand. The, Basic Vocabulary of Business Letters, published "in answer to repeated requests for data on the words appearing most frequently in business letters,"3 is a frequency list specific to business writing. Although the book carries the copyright date of 1943, the vocabulary was compiled much earlier. The listings constitute a part of the data used in the preparation of the 10,000 words making up the ranked frequency list compiled by Ernest Horn and staff and published in 1926 under the title of A Basic Writing Vocabulary: 10,000 Words Lost Commonly Used in Writing. The introduction to that publication gives credit to Miss Cora Crowder for the contribution of her Master's study at the University of Minnesota concerning words found in business writing. With additional data from supplementary sources, the complete listing represents twenty-six classes of business, as follows 1. Miscellaneous 2. Florists 3. Automobile manufacturers and sales companie

Working Papers: Astronomy and Astrophysics Panel Reports

The papers of the panels appointed by the Astronomy and Astrophysics survey Committee are compiled. These papers were advisory to the survey committee and represent the opinions of the members of each panel in the context of their individual charges. The following subject areas are covered: radio astronomy, infrared astronomy, optical/IR from ground, UV-optical from space, interferometry, high energy from space, particle astrophysics, theory and laboratory astrophysics, solar astronomy, planetary astronomy, computing and data processing, policy opportunities, benefits to the nation from astronomy and astrophysics, status of the profession, and science opportunities

Computer graphics, volume 1 Final report, Jun. 29 - Dec. 28, 1967

Computer graphic techniques for numerical control, electrical network analysis, flight mechanics, structural analysis, and engineering drawing retrieva

Poetry's Afterlife: Verse in the Digital Age

At a time when most commentators fixate on American poetry's supposed ""death,"" Kevin Stein's Poetry's Afterlife instead proposes the vitality of its aesthetic hereafter. The essays of Poetry's Afterlife blend memoir, scholarship, and personal essay to survey the current poetry scene, trace how we arrived here, and suggest where poetry is headed in our increasingly digital culture. The result is a book both fetchingly insightful and accessible. Poetry's spirited afterlife has come despite, or perhaps because of, two decades of commentary diagnosing American poetry as moribund if not already deceased. With his 2003 appointment as Illinois Poet Laureate and his forays into public libraries and schools, Stein has discovered that poetry has not given up its literary ghost. For a fated art supposedly pushing up aesthetic daisies, poetry these days is up and about in the streets, schools, and universities, and online in new and compelling digital forms. It flourishes among the people in a lively if curious underground existence largely overlooked by national media. It's this second life, or better, Poetry's Afterlife, that his book examines and celebrates

Annual Report of the University, 1957-1958

TO THE GOVERNOR OF NEW MEXICO: AS PRESIDENT OF THE UNIVERSITY, I have the honor to submit to you, through the Regents, the report of the University of New Mexico for the academic year, 1957-08. The University of New Mexico is clearly a vigorous institution and one which is serving its several educational and cultural functions with distinction\u2026 (The) faculty is composed of competent teachers, who enjoy in an unusual degree the right to help in the determination of institutional policies, and among wham is a sizable body of productive scholars. The University is strong in its record of publications, in its interest in providing services off the campus, in its striving for quality in its educational programs, and in its disposition to take the lead in forwarding bath intellectual and cultural activities within the state