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Task Scheduler (formerly Scheduled Tasks) [1] is a job scheduler in Microsoft Windows that launches computer programs or scripts at pre-defined times or after specified time intervals. [ 2 ] [ 3 ] Microsoft introduced this component in the Microsoft Plus! for Windows 95 as System Agent. [ 4 ]
In addition to the graphical user interface for Windows Task Scheduler in Control Panel, Windows provides an at.exe command that schedules commands and programs to run on a computer at a specified time and date (similar to cron). It is available since Windows NT, but is now deprecated in favor of schtasks.
Task Manager, previously known as Windows Task Manager, is a task manager, system monitor, and startup manager included with Microsoft Windows systems. It provides information about computer performance and running software, including names of running processes , CPU and GPU load, commit charge , I/O details, logged-in users, and Windows services .
In a multiprocessing environment with more than one logical processor (i.e. multiple cores or hyperthreading), more than one task can be running at the same time. However, a process or a thread can be set to run on only a subset of the available logical processors. The Windows Task Manager utility offers a user interface for this at the process ...
regedit.exe: Windows 3.1: Windows Task Scheduler: Allows users to script tasks for running during scheduled intervals taskschd.msc: Microsoft Plus! for Windows 95: Software installation and deployment: Windows Update: An online service providing updates such as service packs, critical updates and device drivers.
Thus whenever the scheduler is called due to the current thread leaving its CPU, another thread can always be found to run on that CPU, even if it is only the CPU's idle thread. The CPU time attributed to the idle process is therefore indicative of the amount of CPU time that is not needed or wanted by any other threads in the system.
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The scheduler is an operating system module that selects the next jobs to be admitted into the system and the next process to run. Operating systems may feature up to three distinct scheduler types: a long-term scheduler (also known as an admission scheduler or high-level scheduler), a mid-term or medium-term scheduler, and a short-term scheduler.