A note on performance of VM/370 in the integration of models and databases
Name
MIT-EL-76-017WP-03683539.pdf
Size
849.42 KB
Format
Adobe PDF
Checksum (MD5)
d565d7e1384a75a5b057f1ce71ce2645
Author(s)
Donovan, John J.
Date Issued
1976
Publisher
MIT Energy Lab
Series/Report no.
MIT-EL
76-017WP
Abstract
As the proliferation of programming systems and database systems continues and, correspondingly, as the need for integrating these systems for
certain applications increases, VM/370 offers a mechanism for such integration. This paper analyzes the performance of a configuration of virtual
machines using VM/370 that allows for the sharing of a database system among
several incompatible programs in an interactive environment.
Specifically, two aspects of performance are addressed--an experimental
study of the overhead cost incurred in the interface mechanisms employed,
and a theoretical study of the degradation of response time due to the
locking mechanisms employed. The conclusion of the experimental observations is that for sophisticated, complex accesses to the database system,
the overhead costs are relatively small. The result of the theoretical
study is the quantification of that degradation as a function of speeds of
the database machine and the rate with which queries are made. The discussion of the practical implications of this theoretical study presents ways
to improve this degradation. The observed conclusion of this work is our
feeling that, for certain application areas, the benefits resulting from
increased effectiveness of users outweigh the costs incurred.
Description
Prepared in association with the Alfred P. Sloan School of Management
Subjects
Virtual computer systems
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