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{{short description|Component of the z/OS operating system}}{{For|general computer workload management software|Job scheduler}}
In [[IBM mainframe]]s, '''Workload Manager''' ('''WLM''') is a base component of [[MVS/ESA]] mainframe [[operating system]], and its successors up to and including [[z/OS]]. It controls the access to system resources for the work executing on z/OS based on administrator-defined goals. Workload Manager components also exist for other operating systems. For example, an '''IBM Workload Manager''' is also a software product for [[AIX operating system]].
== Workload Manager ==
On a mainframe computer many
The system administrator '''classifies''' work to '''service classes'''. The classification mechanism uses work attributes like transaction names, user identifications or program names which specific applications are known to use. In addition the system administrator defines '''goals''' and '''importance levels''' for the service classes representing the application work. The goals define performance expectations for the work. Goals can be expressed as '''response times''', a relative speed (termed '''velocity''') or as '''discretionary''' if no specific requirement exists. The response time describes the duration for the work requests after they entered the system and until the application signals to WLM that the execution is completed. WLM is now interested to assure that the average response time of a set of work requests ends in the expected time or that a percentage of work requests fulfill the expectations of the end user.
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== External links ==
* [https://web.archive.org/web/20051228202242/http://www-03.ibm.com/servers/eserver/zseries/zos/wlm/ Official z/OS WLM Homepage]
== See also ==
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