Job Entry Subsystem (JES),[1] aka Job Entry Subsystem 1 (JES1), was released by IBM as an integral part of OS/VS1 as an enhancement to the basic functions that users of VS1's predecessor, MFT, had.

History

IBM proclaimed[2] JES1 to be "the single most important addition" to the job scheduling provided by VS1. IBM Systems Journal[3] defined JES1's services as Spooling and scheduling, adding "Its three major components are peripheral services, central services, and queue management."

JES1 was not popular,[4]: 5  because HASP and ASP users often had made local modifications (edits),[4]: 9  and wanted to retain their investment.[5]

Features

JES1 permitted operators to submit batch jobs from local unit record equipment.

In addition, Remote Entry Service (RES) permitted remote operators to submit jobs from remote sites[6] to JES. The printed and punched output of jobs running on OS/VS1, whether submitted locally or remotely, is handled by JES and may be routed to local devices, to the originating site or to another remote site.[4][7] The Remote Entry Services (RES)[8] of OS/VS1 is similar to Remote Job Entry (RJE) on OS/360 but the protocol for programmable workstations is that used by HASP II and ASP rather than that used by RJE.

New Features

  • In MFT a reader or writer task tied up a partition; in JES1 a separate partition was required only while starting or stopping the task.
  • In MFT each SPOOL file was a separate physical sequential (PS) dataset on public DASD; in JES1 SPOOL files are kept in a common SPOOL dataset managed by JES1.
  • In MFT a reader task could be delayed by interpreting tasks; in OS/VS1 the interpretation is done when the job is initiated.
  • The JOB Card JCL was given a new option: TYPRUN=SCAN, whereby a job could be submitted for quick feedback, and - if no errors were detected - be submitted again (without TYPRUN=SCAN on the JOB Card.[2]: 399 
  • JES1 used a SubSystem Interface (SSI) similar to that in MVS.

References

  1. ↑ IBM 3800 Printing Subsystem Programmer's Guide (PDF) (Fourth ed.). IBM. January 1980. GC26-3846-3. JES1, the job entry subsystem for OS/VS1.
  2. 1 2 T. F. Wheeler, Jr. (1973). IBM OS/VS1 - An evolutionary growth system. International Workshop on Managing Requirements Knowledge. New York, NY: AFIPS. p. 395. doi:10.1109/AFIPS.1973.92.
  3. ↑ Baily, J. H.; Howard, J. A.; Szczygielski, T. J. (1974). "The job entry subsystem of OS/VS1". IBM Systems Journal. 13 (3): 253–269. doi:10.1147/sj.133.0253. ISSN 0018-8670.
  4. 1 2 3 Tom Wasik. "JES2 Bootcamp - Part 1 of 3: What is JES2 and what does it do" (PDF).
  5. ↑ above IBM document, page 5. Also, there was a HASP modification "clearinghouse" at University of Chicago, from which other HASP users "downloaded" (actually printed via RJE and rekeyed ("Keypunched"); this was before the term download was in use).
  6. ↑ J. M. Hutchinson (March 1980). Job Networking Facilities (PDF). IBM. GG22-9042-00. RJE is usually part of the system or job entry subsystem {{cite book}}: |work= ignored (help)
  7. ↑ which also (p.7) describes this as being an "early 'client server' which "Uses BSC and SNA protocols," adding "still used today." (2013)
  8. ↑ "Remote Entry Services (RES)". OS/VS1 Planning and Use Guide (PDF) (Second ed.). IBM. January 1973. p. 18. GC24-5090-1.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.