Job scheduler

A job scheduler is a computer application for controlling unattended background program execution of jobs. This is commonly called batch scheduling, as execution of non-interactive jobs is often called batch processing, though traditional job and batch are distinguished and contrasted; see that page for details. Other synonyms include batch system, distributed resource management system (DRMS), distributed resource manager (DRM), and, commonly today, workload automation (WLA). The data structure of jobs to run is known as the job queue. Modern job schedulers typically provide a graphical user interface and a single point of control for definition and monitoring of background executions in a distributed network of computers. Increasingly, job schedulers are required to orchestrate the integration of real-time business activities with traditional background IT processing across different operating system platforms and business application environments. Job scheduling should not be confused with process scheduling, which is the assignment of currently running processes to CPUs by the operating system. Basic features expected of job scheduler software include: interfaces which help to define workflows and/or job dependencies automatic submission of executions interfaces to monitor the executions priorities and/or queues to control the execution order of unrelated jobs If software from a completely different area includes all or some of those features, this software can be considered to have job scheduling capabilities. Most operating systems, such as Unix and Windows, provide basic job scheduling capabilities, notably by at and batch, cron, and the Windows Task Scheduler. Web hosting services provide job scheduling capabilities through a control panel or a webcron solution. Many programs such as DBMS, backup, ERPs, and BPM also include relevant job-scheduling capabilities. Operating system ("OS") or point program supplied job-scheduling will not usually provide the ability to schedule beyond a single OS instance or outside the remit of the specific program.