Large Page Size Research Articles

Segmentation, paging and optimal page sizes in virtual memory

On the basis of empirical data two topics concerning virtual memory systems are discussed: determining an optimal page size and performance of segmentation as compared to paging. Several production programs have been executed (on a simulator) both in a segmented system and in a paged system with various page sizes; the memory management was based on the working set policy. The memory usage and the fault rates were recorded, and the lifetime functions and space-time integrals were evaluated. The observations are explained using a new model of program behaviour which is a refinement of the phase-transition model. The results show that there is no globally optimal page size. Two characteristic types of programs are observed: the first requires a small page size and a large window size, the second requires a large page size and a small window size. Segmentation and paging are compared with respect to their usage of various resources. In the sense of the space-time integral, segmentation usually outperforms paging; if the mean segment size is large, the difference is remarkable. Several commonly used assumptions about the effects of page size on program behaviour are validated; some of them are found inaccurate or even wrong.

Segmentation, paging and optimal page sizes in virtual memory

Abstract On the basis of empirical data two topics concerning virtual memory systems are discussed: determining an optimal page size and performance of segmentation as compared to paging. Several production programs have been executed (on a simulator) both in a segmented system and in a paged system with various page sizes; the memory management was based on the working set policy. The memory usage and the fault rates were recorded, and the lifetime functions and space-time integrals were evaluated. The observations are explained using a new model of program behaviour which is a refinement of the phase-transition model. The results show that there is no globally optimal page size. Two characteristic types of programs are observed: the first requires a small page size and a large window size, the second requires a large page size and a small window size. Segmentation and paging are compared with respect to their usage of various resources. In the sense of the space-time integral, segmentation usually outperforms paging; if the mean segment size is large, the difference is remarkable. Several commonly used assumptions about the effects of page size on program behaviour are validated; some of them are found inaccurate or even wrong.

Walsh and Hoyt's Clinical Neuro-Ophthalmology

This book is the first volume of an anticipated three-volume work that will be the fourth edition of a text originally published by Dr Frank Walsh in 1947. The previous editions have been considered the "bible" by clinicians interested in the field of neuro-ophthalmology. This volume is a significant departure in style and format from previous editions. There are many more figures and newer illustrations, photomicrographs, and fundus photographs. The reproductions are generally excellent, and the author has taken advantage of large page size and improved photographic techniques to illustrate salient material. There is a marked reduction and abbreviation of case histories, which are not segregated from the text as in previous editions. References have been pruned and updated as well as possible and are grouped less diffusely. The book's 381 pages cover material presented in approximately 200 pages in the previous edition. Section 1, "The Visual Sensory System," contains

Book reviewA Textbook of Radiology and Imaging. Ed. by SuttonDavid, 3rd edit., pp. xv + 1140 + Index, 1980 (Churchill Livingstone, Edinburgh), £65·00. ISBN 0443–01700X

The first edition of this British textbook was published in 1969. A second edition appeared in 1975 and now a much awaited third edition has been published. There are seven sections as before, with three new contributors and a new section on non-radiological imaging of six chapters with seven contributors. Accordingly, the title has been changed to include imaging, there is a larger page size and it may now be purchased as a single volume or as two volumes. Diagnostic imaging has become more wide-ranging during the last five years and Dr. Sutton and his co-authors have attempted to bring together all branches of the subject into one book.

1979: Affiliation with the Paediatric Research Society of Australia and a Change in Format

During 1978 the Australian College of Paediatrics and the Paediatric Research Society of Australia agreed that the Australian Paediatric Journal would now represent both associations. The Paediatric Research Society, which was established in 1966, is now a vigorous group of about 150 scientists and doctors actively involved in paediatric research in Australia.We welcome this increase in the Journal's affiliation and trust that with it will come an increasing number of papers reporting the wide range of research interests of the Society's members.This first issue of 1979 is printed on a larger page size. The decision to change page size was made on grounds of economy, both to suit our clients who support the Journal with advertisements and to help contain the increasing costs of printing. We hope the change in format will be welcomed by our readers.

Experiments on Page Size, Program Access Patterns, and Virtual Memory Performance

The assumption about virtual memory systems that as overhead (time for access and software page management) decreases page size should be reduced is not alwayas good one. Recent experiments indicate that larger page sizes can provide better performance for programs that make highly localized use of memory space.

Diseases of the Breast

Fifteen years have elapsed since first publication of this volume. The first edition, rich in detail and scholarship, was judged the classic in its field; this work has maintained the same standard. Extensively rewritten, expanded, and updated, the new edition has a larger page size and 78 pages have been added. Organization of the subject includes an initial 3 chapters on normal and abnormal anatomy and physiology, followed by 3 chapters on diagnosis, 14 on various aspects of benign and malignant lesions other than adenocarcinoma, 14 on the various lesions of adenocarcinoma, and 5 on treatment. Everything one could possibly wish to know concerning the breast seems to be covered. Much of the work bears the authority of Haagensen's 40 years of experience at Columbia-Presbyterian Medical Center where he specialized in disease of the breast. The chapter on selection of patients for operation describes many criteria which he introduced and

A Textbook of Medicine.

One hundred and fifty-four authors have collaborated under the editorship of Drs. Cecil and Kennedy to produce this book. It is the sixth edition of this well known textbook, which first appeared in 1927. Any work that goes through six editions in fifteen years may be accepted as worth while. The book is familiar to most physicians, but the present edition contains much that is new and much that has been thoroughly rewritten. Aviation medicine, air sickness, virus pneumonia and hirudinea represent a few of the innovations. The form of the book has been changed so that much new material has been added without increasing the already large size too much. As a matter of fact, there are fewer pages, but the larger page size and the arrangement of the material in double columns more than make up for that. This work still remains a standard one for students, teachers