October 2006
Intermediate to advanced
336 pages
9h 13m
English
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Real-Time Characteristics
Engineers often use the term real-time to describe computing problems for which a late answer is as bad as a wrong one. These problems are said to have deadlines, and embedded systems frequently operate under such constraints. For example, if the embedded software that controls your antilock brakes misses one of its deadlines, you might find yourself in an accident. So it is extremely important that the designers of real-time embedded systems know everything they can about the behavior and performance of their hardware and software. In this section, we will discuss the performance characteristics of real-time operating systems.
The designers of real-time systems spend a large amount of their time worrying about worst-case performance. They must constantly ask themselves questions such as: what is the worst-case amount of time between the moment a human operator presses the brake pedal and the moment an interrupt signal arrives at the processor? What is the worst-case interrupt latency? And what is the worst-case amount of time for the software to respond by triggering the braking mechanism? Average or expected-case analysis simply will not suffice in such systems.
Most of the real-time operating systems available today are designed for possible inclusion in real-time systems. Ideally, their worst-case performance is well understood and documented. To earn the distinctive title of “real-time operating system,” an operating system should be deterministic ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.