ENVS 1500 Lecture Notes - Lecture 18: Handwriting Recognition, Multiprocessing, System Administrator
13 May 2018
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ENVS 1500 Tutorial 18 Notes – Automatic Cutover
Introduction
• Strong support for clustering and multiprocessing, improved mechanisms for failure
prevention, automatic cutover to alternative systems when failures occur, and failure
recovery, as well as strong system administration capability.
• Mobile operating systems are operating systems designed for small hand-held devices,
such as personal digital assistants (PDAs) and smart phones.
• These systems must provide the basic capabilities and features of traditional single-user
multitasking systems within the constraints of electrical power limitations, limited
memory, lower CPU execution speed, and slower network capability.
• File storage that are generally limited to small stationary nonvolatile memory devices.
• Along with some special features that would not be required in a larger system.
• Such as touch screen capability, special keyboard handling, careful management of
battery power consumption, support for special I/O devices such as global positioning
and telephony mechanisms.
• Features for synchronizing data with other systems, and handwriting recognition.
• Real-time systems are systems in which one or more processes must be able to access
the CPU immediately when required.
• Real-time systems are used for applications in which one or more programs are
measuring or controlling I/O devices that must respond within specific time restraints.
• A real-time system might be used to control instrumentation, such as the control
rockets on a space flight.
• To measure time-sensitive data, such as the periodic measurements of the temperature
in a nuclear reactor.
• Although some real-time systems are created special for the particular application, most
are general-purpose multitasking systems that have been designed so that they can be
used for other tasks except when the time-sensitive application is being executed.
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