"A real-time system must provide a response to a request within
a specified period of time. Most often, requests are recurring,
with requests made on a periodic basis for a common set of
services. Real-time systems provide these periodic services, which
produce output upon request to control systems. Examples might
include a digital control for an antilock braking system, a digital
autopilot to maintain steady, level flight for an aircraft, or
video stream compression and decompression.
"For systems where requests are not periodic, the system can be
analyzed to determine a worst-case interarrival rate for service
requests. For example, in a fault-handling system, an upper bound
on the fault rate that the system can handle can and should be
established. In normal operation, the fault rate might be zero, but
the assumption of a maximum rate ensures that computing resources
are held in reserve..."
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