Editing Batch processing (section)

== Notable batch scheduling and execution environments ==
The [[IBM mainframe]] [[z/OS]] [[operating system]] or platform has arguably the most highly refined and evolved set of batch processing facilities owing to its origins, long history, and continuing evolution. Today such systems commonly support hundreds or even thousands of concurrent online and batch tasks within a single [[operating system]] image. Technologies that aid concurrent batch and online processing include [[Job Control Language]] (JCL), scripting languages such as [[REXX]], Job Entry Subsystem ([[JES2]] and [[JES3]]), [[Workload Manager]] (WLM), Automatic Restart Manager (ARM), Resource Recovery Services (RRS), [[IBM Db2]] data sharing, [[Parallel Sysplex]], unique performance optimizations such as [[HiperDispatch]], [[Channel I/O|I/O channel architecture]], and several others.

The Unix programs <code>[[cron (Unix)|cron]]</code>, <code>[[at (command)|at]]</code>, and <code>[[batch (Unix)|batch]]</code> (today <code>batch</code> is a variant of <code>at</code>) allow for complex scheduling of jobs. Windows has a [[job scheduler]]. Most [[high-performance computing]] [[Cluster (computing)|clusters]] use batch processing to maximize cluster usage.<ref>{{cite web 
|date=January 25, 2018
|url=https://www.slideshare.net/raamana/high-performance-computing-with-checklist-and-tips-optimal-cluster-usage
|title=High performance computing tutorial, with checklist and tips to optimize
|quote=a multi-user, shared and smart batch processing system improves the scale ..... Most ''HPC'' clusters are in Linux}}</ref>