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- 3 abstract "The Job Entry Subsystem (JES) is a component of IBM's MVS (OS/VS2 R2 through z/OS) operating systems that receives jobs into the computer system, schedules them for processing, and controls their output processing. There is also a JES in OS/VS1, often referred to as JES1. While MVS/370's immediate predecessor, SVS, retained the spooling facilities of OS/360, most installations used the optional ASP Version 3 or HASP II Version 4. sometimes incorrectly referred to as HASP4; ASP V3 is available for OS/360 and HASP II V4 has been quite easily retrofitted to OS/360, even on systems which did not, and cannot support the System/370 instruction set.In MVS, JES is a task that runs under MVS and provides the necessary functions to get jobs in to, and jobs out of, the MVS operating system, and to control the scheduling of, and, indeed, their execution. It is designed to provide efficient spooling, scheduling, and management facilities for the MVS operating system. By separating job processing into a number of tasks, MVS operates more efficiently. At any point in time, the computer system resources are busy processing the tasks for individual jobs, while other tasks are waiting for those resources to become available. In its most simple view, MVS divides the management of jobs and resources between the JES and the base control program of MVS. In this manner, the JES manages jobs before (i.e., during the reading and scheduling phases) and after the completion of running the program (i.e., the printing, punching and purgeing phases); the base control program manages them during processing, usually without any specific knowledge of JES. There are three job entry subsystems in MVS; Master, JES2 and JES3. The Master subsystem is used during system initialization and for starting system tasks that must run outside of the control of the primary JES; in particular, it is used to start the primary JES.The other two job entry subsystems have very little in common, and in fact jobs written to run on one usually require small Job Control Language changes before they can be run on the other.JES2 (Job Entry Subsystem 2) is descended from the Houston Automatic Spooling Priority (HASP) system, developed by the contractor programmers of IBM as self-initiative and eventually owned and supported by IBM for NASA's Houston-based Manned Spaceflight Center, hence the root word in its name, in the mid 1960s.JES3 (Job Entry Subsystem 3) is similarly descended from the Attached Support Processor (ASP), which was IBM's initially preferred system for OS/360 \"unit record I/O\", although JES2's \"shared SPOOL\" program product (NJE) ultimately displaced JES3 (and even JES2) in many cases.JES3 Main Device Setup (MDS) has more control over data sets shared between systems than JES2, and JES3 Dependent Job Control (DJC) has more provisions for scheduling jobs with dependencies on each other than JES2. With the widespread use of sophisticated job scheduling software, DJC has become less important.".
- 3 wikiPageExternalLink zconc_jes2vsjes3.htm.
- 3 wikiPageExternalLink zconc_whatisjes.htm.
- 3 wikiPageID "1356191".
- 3 wikiPageLength "9794".
- 3 wikiPageOutDegree "28".
- 3 wikiPageRevisionID "690557782".
- 3 wikiPageWikiLink Attached_Support_Processor.
- 3 wikiPageWikiLink Batch_processing.
- 3 wikiPageWikiLink Category:IBM_mainframe_operating_systems.
- 3 wikiPageWikiLink Category:Job_scheduling.
- 3 wikiPageWikiLink Category:Remote_job_entry.
- 3 wikiPageWikiLink Category:Software_written_primarily_in_assembly_language.
- 3 wikiPageWikiLink Channel-to-channel_adapter.
- 3 wikiPageWikiLink O.
- 3 wikiPageWikiLink Houston_Automatic_Spooling_Priority.
- 3 wikiPageWikiLink IBM.
- 3 wikiPageWikiLink IBM_7040.
- 3 wikiPageWikiLink IBM_7090.
- 3 wikiPageWikiLink 360_Model_50.
- 3 wikiPageWikiLink 370.
- 3 wikiPageWikiLink Job_Control_Language.
- 3 wikiPageWikiLink Lyndon_B._Johnson_Space_Center.
- 3 wikiPageWikiLink MVS.
- 3 wikiPageWikiLink 360_and_successors.
- 3 wikiPageWikiLink VS1.
- 3 wikiPageWikiLink VS2_(SVS).
- 3 wikiPageWikiLink SDSF.
- 3 wikiPageWikiLink Spooling.
- 3 wikiPageWikiLink OS.
- 3 wikiPageWikiLinkText "IBM JES 2 and 3".
- 3 wikiPageWikiLinkText "JES Spool".
- 3 wikiPageWikiLinkText "JES".
- 3 wikiPageWikiLinkText "JES2 and JES3".
- 3 wikiPageWikiLinkText "JES2 or JES3".
- 3 wikiPageWikiLinkText "JES2".
- 3 wikiPageWikiLinkText "Job Entry Subsystem (JES)".
- 3 wikiPageWikiLinkText "Job Entry Subsystem 2/3".
- 3 wikiPageWikiLinkText "Job Entry Subsystem 3".
- 3 wikiPageWikiLinkText "Job Entry Subsystems".
- 3 wikiPageUsesTemplate Template:Reflist.
- 3 wikiPageUsesTemplate Template:Rp.
- 3 subject Category:IBM_mainframe_operating_systems.
- 3 subject Category:Job_scheduling.
- 3 subject Category:Remote_job_entry.
- 3 subject Category:Software_written_primarily_in_assembly_language.
- 3 hypernym Component.
- 3 type Language.
- 3 type MilitaryUnit.
- 3 type Language.
- 3 comment "The Job Entry Subsystem (JES) is a component of IBM's MVS (OS/VS2 R2 through z/OS) operating systems that receives jobs into the computer system, schedules them for processing, and controls their output processing. There is also a JES in OS/VS1, often referred to as JES1. While MVS/370's immediate predecessor, SVS, retained the spooling facilities of OS/360, most installations used the optional ASP Version 3 or HASP II Version 4.".
- 3 label "Job Entry Subsystem 2/3".
- 3 sameAs Q355203.
- 3 sameAs Job_Entry_Subsystem.
- 3 sameAs Job_Entry_SubSystem.
- 3 sameAs 3.
- 3 sameAs 3.
- 3 sameAs m.04wblh.
- 3 sameAs Job_Entity_Subsystem.
- 3 sameAs Q355203.
- 3 wasDerivedFrom 3?oldid=690557782.
- 3 isPrimaryTopicOf 3.