NDLI: A model of Univac 1100/42 swapping

Content Provider	ACM Digital Library
Author	Breitenlohner, Hans J. Dowdy, Lawrence W.
Abstract	The performance of a computer system depends upon the efficiency of its swapping mechanisms. The swapping efficiency is a complex function of many variables. The degree of multiprogramming, the relative loading on the swapping devices, and the speed of the swapping devices are all interdependent variables that affect swapping performance. In this paper, a model of swapping behavior is given. The interdependencies between the degree of multiprogramming, the swapping devices' loadings, and the swapping devices' speeds are modeled using an iterative scheme. The validation of a model is its predictive capability. The given swapping model was applied to a Univac 1100/42 system to predict the effect of moving the swapping activity from drums to discs. When the swapping activity was actually moved, throughput increased by 20%. The model accurately predicted this improvement. Subtopics discussed include: 1) the modeling of blocked and overlapped disc seek activity, 2) the usefulness of empirical formulae, and 3) the calibration of unmeasurable parameters. Extensions and further applications of the model are given.
Starting Page	36
Ending Page	47
Page Count	12
File Format	PDF
ISSN	01635999
DOI	10.1145/1010629.805472
Journal	ACM SIGMETRICS Performance Evaluation Review (PERV)
Volume Number	10
Issue Number	3
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2014-01-10
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Closed queuing networks Model validation Performance prediction Parameter interdependencies Swapping
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Hardware and Architecture Software

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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