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Control Language Converter/Inverter

IP.com Disclosure Number: IPCOM000079641D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Ziller, E: AUTHOR

Abstract

In prior operating systems, job control statements were read into the system, converted to a text string, expanded into tables and the tables were written in a job queue data set on a direct-access device. Later, when the job is being selected, the tables were read into storage. The direct-access space required for job information in tabular form, is six times that required for the same information in textual form. Thus, a given amount of direct-access storage space can contain six times as many jobs in textual form as in tabular form.

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Control Language Converter/Inverter

In prior operating systems, job control statements were read into the system, converted to a text string, expanded into tables and the tables were written in a job queue data set on a direct-access device. Later, when the job is being selected, the tables were read into storage. The direct-access space required for job information in tabular form, is six times that required for the same information in textual form. Thus, a given amount of direct-access storage space can contain six times as many jobs in textual form as in tabular form.

The general system may be improved by the illustrated process, in which the JCL (job control language) statements are first converted to textual form and then written in such form to a data set. At job selection time, the textual form is written into storage and expanded by an interpreter into tables for controlling the job. This allows the time spent accessing the job information on the direct-access device to be reduced by a factor of six, in accordance with the above-mentioned increased density of storing the job information. The concept also allows the elimination of the prior job queue, and has the advantage of making the job information more readily available to the individual CPUs of a multiprocessing or network processing system.

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