Activity Based Costing techniques for workload characterization.

This paper addresses the problem of non-captured service demands in workload monitoring data. Capture ratios are the coefficients that correct the workload service demands so that they fit the global system monitoring data. This paper proposes new techniques for the determination of capture ratios by means of Activity Based Costing techniques. The techniques are illustrated by means of a case study, which also illustrates the non-trivial nature of capture ratios in practical performance analysis.Activity based costing;

B-LOG: A branch and bound methodology for the parallel execution of logic programs

We propose a computational methodology -"B-LOG"-, which offers the potential for an effective implementation of Logic Programming in a parallel computer. We also propose a weighting scheme to guide the search process through the graph and we apply the concepts of parallel "branch and bound" algorithms in order to perform a "best-first" search using an information theoretic bound. The concept of "session" is used to speed up the search process in a succession of similar queries. Within a session, we strongly modify the bounds in a local database, while bounds kept in a global database are weakly modified to provide a better initial condition for other sessions. We also propose an implementation scheme based on a database machine using "semantic paging", and the "B-LOG processor" based on a scoreboard driven controller

C-MOS array design techniques: SUMC multiprocessor system study

The current capabilities of LSI techniques for speed and reliability, plus the possibilities of assembling large configurations of LSI logic and storage elements, have demanded the study of multiprocessors and multiprocessing techniques, problems, and potentialities. Evaluated are three previous systems studies for a space ultrareliable modular computer multiprocessing system, and a new multiprocessing system is proposed that is flexibly configured with up to four central processors, four 1/0 processors, and 16 main memory units, plus auxiliary memory and peripheral devices. This multiprocessor system features a multilevel interrupt, qualified S/360 compatibility for ground-based generation of programs, virtual memory management of a storage hierarchy through 1/0 processors, and multiport access to multiple and shared memory units

Proceedings of the NSSDC Conference on Mass Storage Systems and Technologies for Space and Earth Science Applications

The proceedings of the National Space Science Data Center Conference on Mass Storage Systems and Technologies for Space and Earth Science Applications held July 23 through 25, 1991 at the NASA/Goddard Space Flight Center are presented. The program includes a keynote address, invited technical papers, and selected technical presentations to provide a broad forum for the discussion of a number of important issues in the field of mass storage systems. Topics include magnetic disk and tape technologies, optical disk and tape, software storage and file management systems, and experiences with the use of a large, distributed storage system. The technical presentations describe integrated mass storage systems that are expected to be available commercially. Also included is a series of presentations from Federal Government organizations and research institutions covering their mass storage requirements for the 1990's

Computer processing support, volume 4

There are no author-identified significant results in this report

Secure Virtualization and Multicore Platforms State-of-the-Art report

SVaM

MOSS, an evaluation of software engineering techniques

An evaluation of the software engineering techniques used for the development of a Modular Operating System (MOSS) was described. MOSS is a general purpose real time operating system which was developed for the Concept Verification Test (CVT) program. Each of the software engineering techniques was described and evaluated based on the experience of the MOSS project. Recommendations for the use of these techniques on future software projects were also given

Cloud-Based Virtual Memory System in which Memory Pages Are Offloaded to Cloud Storage

This publication describes systems and techniques to implement virtual memory to swap memory regions, such as memory pages, between a resource-constrained electronic device and cloud storage. Many “always-connected” or internet of things (IoT) devices are resource constrained such that dynamic random-access memory (DRAM) and flash memory are significantly limited. Excessive write operations can also reduce a usable lifetime of the flash memory. For cloud-based virtual memory, pages corresponding to working sets of more important applications are maintained in DRAM at the device. In contrast, a virtual memory system moves memory pages that are used less frequently based on some metric (e.g., least recently used (LRU)) from the DRAM to cloud storage that is located at a remote server. The virtual memory system may compress the memory pages to save transmission and/or storage bandwidth. The remote pages may also be updated without moving them back to the device. In this manner, an electronic device can have more or larger active applications without over-consuming DRAM or increasing wear on the flash memory