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The performance of the NEC SX-2 and Cray X-MP supercomputers

Description: Since our first article on the Japanese supercomputers appeared in the December 1985 issue of Computer, we have conducted additional benchmarks of the new NEC SX-2 vector processor. We present these new results for the SX-2 and updated timings of the X-MP/48. 5 refs., 1 fig., 6 tabs.
Date: January 1, 1987
Creator: Lubeck, O. M.; Moore, J. W. & Mendez, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of a Cray performance tool using a large hydrodynamics code

Description: This paper will discuss one of these automatic tools that has been developed recently by Cray Research, Inc. for use on its parallel supercomputer. The tool is called ATEXPERT; when used in conjunction with the Cray Fortran compiling system, CF77, it produces a parallelized version of a code based on loop-level parallelism, plus information to enable the programmer to optimize the parallelized code and improve performance. The information obtained through the use of the tool is presented in an … more
Date: January 1, 1992
Creator: Lord, K.M. (Cray Research, Inc., Eagan, MN (United States)) & Simmons, M.L. (Los Alamos National Lab., NM (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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ADIFOR: Automatic differentiation in a source translator environment

Description: The numerical methods employed in the solution of many scientific computing problems require the computation of derivatives of a function f: R{sup n} {yields} R{sup m}. ADIFOR (Automatic Differentiation in FORtran) is a source transformation tool that accepts Fortran 77 code for the computation of a function and writes portable Fortran 77 code for the computation of the derivatives. In contrast to previous approaches, ADIFOR views automatic differentiation as a source transformation problem and… more
Date: January 1, 1992
Creator: Bischof, C.; Corliss, G.; Griewank, A. (Argonne National Lab., IL (United States)) & Carle, A. (Rice Univ., Houston, TX (United States). Center for Research on Parallel Computation)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Floating Point Hardware Emulator for RSX-11D

Description: An RSX-11D task was written to simulate the FP-11 floating point hardware on systems that lack this hardware. The simulation is transparent to tasks using floating point instructions. All normal features of the hardware are simulated exactly, including its action on exception conditions. The emulator is a privileged task occupying about 2.7K words of memory. When it is loaded and run, it sets up a linkage to intercept the reserved instruction trap before it reaches the executive, and route it t… more
Date: January 1, 1977
Creator: Kellogg, M. & Long, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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CDC 7600 LTSS programming stratagens: preparing your first production code for the Livermore Timesharing System

Description: This report deals with some techniques in applied programming using the Livermore Timesharing System (LTSS) on the CDC 7600 computers at the National Magnetic Fusion Energy Computer Center (NMFECC) and the Lawrence Livermore Laboratory Computer Center (LLLCC or Octopus network). This report is based on a document originally written specifically about the system as it is implemented at NMFECC but has been revised to accommodate differences between LLLCC and NMFECC implementations. Topics include… more
Date: August 15, 1977
Creator: Fong, K. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Overview of the Division 2351 Neutron Generator Test Facility waveform digitizing system. [Explosively activated neutron generators]

Description: All neutron generator waveforms from units tested at the SLA neutron generator test site are digitized and the digitized data stored in the CDC 6600 tape library for display and analysis using the CDC 6600 computer. The digitizing equipment consists mainly of seven Biomation Model 8100 transient recorders, Digital Equipment Corporation PDP 11/20 computer, RK05 disk, seven-track magnetic tape transport, and appropriate DEC and SLA controllers and interfaces. The PDP 11/20 computer is programmed … more
Date: February 1, 1978
Creator: Bryant, T.C. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ADIFOR: Fortran source translation for efficient derivatives

Description: The numerical methods employed in the solution of many scientific computing problems require the computation of derivatives of a function f: R{sup n} {yields} R{sup m}. Both the accuracy and the computational requirements of the derivative computation are usually of critical importance for the robustness and speed of the numerical method. ADIFOR (Automatic Differentiation In FORtran) is a source translation tool implemented using the data abstractions and program analysis capabilities of the Pa… more
Date: January 1, 1992
Creator: Bischof, C.; Corliss, G.; Griewank, A.; Hovland, P. (Argonne National Lab., IL (United States)) & Carle, A. (Rice Univ., Houston, TX (United States). Center for Research on Parallel Computation)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Implementation of logical networks in System 2000 data bases

Description: The need for a means to express general relationships (networks) among entity occurrences (data sets) in System 2000 data bases is established. Integer expression of general path segments is described as a means to meet this need. Operations on the expressions are also described. Two possible implementations are discussed. Either or both of these implementations can be included by the user in System 2000 data bases. They are compatible with the System 2000 hierarchical data model, and could als… more
Date: May 1, 1980
Creator: Hall, R. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Scylla IV-P computer based on control and data acquisition system

Description: The main computer is a Prime 300 with 64 K words of main storage, two Tektronix 4010 terminals, a Versatec line printer, a card reader, and two 3 M word disks. The control software is also described along with the data acquisition system. (MOW)
Date: January 1, 1977
Creator: Conrad, R.; Lillberg, J.W. & Wilkins, R.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

HELPER: a superintelligent terminal based on RT-11

Description: The HELPER minicomputer hardware and software capabilities are thoroughly explained and critically reviewed. HELPER is a cost-effective assistant to an interactive host system. The recommendations are to assign specific types of tasks to HELPER and to study the resulting effects on users. Improvements to the present HELPER hardware are also suggested. 2 figures.
Date: January 1, 1977
Creator: Schultz, D.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Economic evaluation of the annual cycle energy system (ACES). Final report. Volume III, appendices

Description: This volume consists of seven appendices related to ACES, the first three of which are concerned with computer programs. The appendices are entitled: (A) ACESIM: Residential Program Listing; (B) Typical Inputs and Outputs of ACESIM; (C) CACESS: Commercial Building Program Listing; (D) Typical Weather-Year Selection Requirements; (E) Building Characteristics; (F) List of Major Variables Used in the Computer Programs; and (G) Bibliography. 79 references.
Date: June 1, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Software package as an information center product. [Activities of Argonne Code Center]

Description: The Argonne Code Center serves as a software exchange and information center for the U.S. Energy Research and Development Administration and the Nuclear Regulatory Commission. The goal of the Center's program is to provide a means for sharing of software among agency offices and contractors, and for transferring computing applications and technology, developed within the agencies, to the information-processing community. A major activity of the Code Center is the acquisition, review, testing, a… more
Date: January 1, 1977
Creator: Butler, M.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radian remote sampling system digital processor system. Software detail documentation: Pittsburgh Energy Research Center

Description: Software documentation for the DART data acquisition system is provided. This system runs on a minicomputer. After an overview of the system and file structures, the various subprograms are discussed individually; flow charts are included. 37 figures. (RWR)
Date: November 1, 1979
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An assessment of the ModSim/TWOS parallel simulation environment

Description: The Time Warp Operating System (TWOS) has been the focus of significant research in parallel, discrete-event simulation (PDES). A new language, ModSim, has been developed for use in conjunction with TWOS. The coupling of ModSim and TWOS is an attempt to address the development of large-scale, complex, discrete-event simulation models for parallel execution. The approach, simply stated, is to provide a high-level simulation-language that embodies well-known software engineering principles combin… more
Date: January 1, 1991
Creator: Rich, D.O. & Michelsen, R.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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XTAL system of crystallographic programs: programmer's manual

Description: This document establishes the basis for collaborative writing of transportable computer programs for x-ray crystallography. The concepts and general-purpose utility subroutines described here can be readily adapted to other scientific calculations. The complete system of crystallographic programs and subroutines is called XTAL and replaces the XRAY (6,7,8) system of programs. The coding language for the XTAL system is RATMAC (5). The XTAL system of programs contains routines for controlling exe… more
Date: February 1, 1980
Creator: Hall, S. R.; Stewart, J. M.; Norden, A. P.; Munn, R. J. & Freer, S. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Querying genomic databases

Description: A natural-language interface has been developed that retrieves genomic information by using a simple subset of English. The interface spares the biologist from the task of learning database-specific query languages and computer programming. Currently, the interface deals with the E. coli genome. It can, however, be readily extended and shows promise as a means of easy access to other sequenced genomic databases as well.
Date: September 1, 1991
Creator: Baehr, A.; Hagstrom, R.; Joerg, D. & Overbeek, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computer Facilities for Isabelle Data Handling

Description: The analysis of data produced by Isabelle experiments will need a large system of computers. Included in the array should be a substantial computer system at each Isabelle intersection in use. These systems must include enough computer power to keep experimenters aware of the status of the experiment. This will require at least one very fast sophisticated processor in the system, the size depending on the experiment. Other features of the intersection systems must be a good, high speed graphic … more
Date: January 1, 1977
Creator: Kramer, M. A.; Love, W. A.; Miller, R. J. & Zeller, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Front-end data processing the SLD data acquisition system

Description: The data acquisition system for the SLD detector will make extensive use of parallel at the front-end level. Fastbus acquisition modules are being built with powerful processing capabilities for calibration, data reduction and further pre-processing of the large amount of analog data handled by each module. This paper describes the read-out electronics chain and data pre-processing system adapted for most of the detector channels, exemplified by the central drift chamber waveform digitization a… more
Date: July 1, 1986
Creator: Nielsen, B. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The MTX (Microwave Tokamak Experiment) data acquisition system

Description: The diagnostic data from the MTX experiment is acquired and processed by an expandable, distributed, multivendor computer network. The system blends a variety of software into a coordinated, unified, and highly flexible design. Using modular software design techniques, we created a system stressing distributed processing, portability, and transparent data access. In our approach to modularity, we standardized communication interfaces between modules and separated generic tasks from machine and … more
Date: September 20, 1989
Creator: Butner, D. N.; Drlik, M.; Brown, M. D.; Casper, T. A.; Meyer, W. H. & Moller, J. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Particle accelerator control and data acquisition in the context of VAX/VMS

Description: The Los Alamos Meson Physics Facility (LAMPF) Control System monitors and controls a linear accelerator through more than 10,000 widely disparate I/O devices. The heart of the Control System software is the Data System, which provides a uniform application program interface based on symbolic device names. In many ways the Data System parallels the VAX/VMS Record Management Services (RMS) in its needs for asynchronous operations, protection, and locks for multiprocess interactions. Since the acc… more
Date: January 1, 1983
Creator: Schaller, S.C. & Corley, J.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Computer programs, to determine credible regions for Weibull distribution

Description: Computer software for analyzing life test data with a Weibull distribution is given. The programs calculate and plot the 95, 90, 50 and 5% highest probability density contours and the maximum likelihood estimators on the same frame for all sets of data. They also calculate the maximum likelihood estimator of mean life and conservative 95, 90, 50 and 5% credible intervals on mean life. The programs are used to analyze data on the lifetimes of Kevlar/Epoxy spherical vessels and the results are gi… more
Date: unknown
Creator: Agrawal, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Debugging in a parallel environment

Description: This paper describes the preliminary results of a project investigating approaches to dynamic debugging in parallel processing systems. Debugging programs in a multiprocessing environment is particularly difficult because of potential errors in synchronization of tasks, data dependencies, sharing of data among tasks, and irreproducibility of specific machine instruction sequences from one job to the next. The basic methodology involved in predicate-based debuggers is given as well as other desi… more
Date: January 1, 1985
Creator: Wasserman, H.J. & Griffin, J.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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