What does scheduler mean?
A scheduler is something that decides when work will happen and in what order. Its dominant modern use is in computing, where a task, job, or CPU scheduler allocates resources and determines when programs or individual operations should run. Depending on the design, a scheduler may run tasks in sequence, give each task a share of available time, or prioritize urgent work. The term can also refer to a person who coordinates appointments, shifts, meetings, or project work. Although “scheduler” plainly conveys organization and advance planning, its technical meaning often implies efficiency, fairness, and control over limited processing resources. It is therefore useful for describing both human coordination and the automated systems that impose order on large numbers of competing tasks.
nounA person or system that organizes work into a schedule. In computing, a scheduler is software that determines when and in what order tasks or processes are executed.
- A software component or system that determines when and in what order tasks, processes, or jobs are to be run.
- A person responsible for arranging activities, appointments, or work according to a schedule.
"The operating system uses a scheduler to allocate processor time among competing programs."
"The job scheduler starts each task at the appropriate time and may pause it if necessary."
"As project scheduler, she coordinated meetings, deadlines, and the allocation of staff."
The plural is used when referring to multiple people, systems, or software components that perform scheduling functions.
"The two schedulers coordinate jobs across separate processing clusters."
A scheduler decides what runs next, making it the traffic controller of a computer.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does scheduler come from?
The word “scheduler” was formed from “schedule” plus the agent suffix “-er,” meaning a person or thing that schedules. “Schedule” comes through Old French from Latin schedula, a diminutive of scheda meaning a small paper or sheet of paper, originally referring to a written timetable. Over time, the word developed from a written list of times into both the practice of arranging activities and the arrangement itself. The modern computing sense follows the older sense of organizing work according to an ordered timetable.
How scheduler is actually used
The word is used especially in computing for both the scheduling software itself and its scheduling algorithm. Outside technical contexts, it usually refers to a person who prepares timetables or coordinates appointments.