A key characteristic of an RTOS is the level of its consistency concerning the amount of time it takes to accept and complete an application's task; the variability is jitter. A hard real-time operating system has less jitter than a soft real-time operating system. The chief design goal is not high throughput, but rather a guarantee of a soft or hard performance category. An RTOS that can usually or generally meet a deadline is a soft real-time OS, but if it can meet a deadline deterministically it is a hard real-time OS.
An RTOS has an advanced algorithm for scheduling. Scheduler flexibility enables a wider, computer-system orchestration of process priorities, but a real-time OS is more frequently dedicated to a narrow set of applications. Key factors in a real-time OS are minimal interrupt latency and minimal thread switching latency; a real-time OS is valued more for how quickly or how predictably it can respond than for the amount of work it can perform in a given period of time.
Other articles related to "operating systems":
... An early example of a large-scale real-time operating system was the Transaction Processing Facility developed by American Airlines and IBM for the ... the best known, most widely deployed, real-time operating systems are LynxOS OSE QNX RTLinux VxWorks Windows CE See the list of real-time operating systems for a comprehensive list ... Also, see the list of operating systems for all types of operating systems ...
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