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Why incremental development less appropriate for real-time systems engineering?
Wiki User
∙ 10y ago
This model is effective for developing because the developer can let the customer comment on what has been done before go to the next developing or point what we call it feedback , the customer can able to use and gain value from the software
Wiki User
∙ 10y ago
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Differences between single user operating system and real-time operating system?
A single user OS could also be a real-time system. The differences in the two are based on how a process is given control or priority within the system. Realtime systems give preferences to realtime control processes (realtime runs at a much higher priority level). Most single-user operating systems treat processes with equal priority unless you indicate that a certain process is to receive preferential treatment. This can be done by raising the priority of the user process to that of realtime, meaning it will receive resources (such as CPU cycles) above other programs in the system.
What are the requirements of realtime operating systems?
Technically, all operating systems are "realtime." The term realtime just means it happens immediately, versus being delayed. Most operating systems today are actually a blend of realtime and "batch." Batch processing is doing something later, usually waiting until you have more than one thing (a "batch") to do. An example of batch processing is when a company processes your payment. They don't post each payment to their computer system - they wait until all the payments are in for the day (or at least a good number of them) and then post them as a group - so thousands of payments get posted at one time (posted just means processed through some financial system). Some businesses, such as banks, will use both realtime and batch processing for the same items. For example, if you make a deposit with a teller, you will probably be able to go to Starbucks next door, sign on the internet, and see the the deposit posted to your account already. This is "realtime" processing. However...this is probably only a "memo" post. This means it was only posted to the online system so that you can get to it through the internet or telephone. During the night, your deposit will be sent to a central site and batch processed with thousands of other deposits. The night post will be to the "real" posting system for checks, the "Demand Deposit Accounting" system, or DDA. The biggest use "realtime" operating systems is actually in what is called "embedded" systems. These are operating systems and application code that is running on a single board and embedded in something physical - a car, a toaster, a TV set, a DVD player, an IPOD. Today, if it is electronic, it probably has an embedded system (or even several). Embedded systems are primarily realtime operating systems - they collect some statistics in realtime and allow access to them later in batch mode (here are all the errors that occurred on your car since it was last serviced...) but their real job is to control the device they are embedded in - and do it in "realtime" or immediately. This means they must be: - dependable - they must operate in all sorts of conditions - hot, cold, dirty, greasy, noisy, vibrations etc. - timely - they must be fast enough to think about an action, and get it done right away. For example, if you are an embedded system in a car that controls skidding, you must be able to react to the skid in "realtime" - as it is happening, and control brakes, steering and gas as appropriate to what is happening (skid starting, car is curving to right, skid is ending). - flexible - in the previous example, the embedded system to control skids must be able to handle a car going any speed, curving right, left or going straight, know when it is "over compensating" and correct it etc. It must be able to make the same decisions a knowledable human would make in the same circumstances. - sized properly - again, the previous example. The embedded system must be able to recognize and react to thousands of varying facts (speed, direction, condition and status of mechanical systems etc.). You must have a processor fast enough to process the data in realtime, and enough storage to accept, and display, conditions and status of "analog" devices. Note - most realtime systems are in what we know as "analog" devices. This just means they have something mechanical about them. Most parts of a car are analog, as are most TV set these days. This is versus "digital", where parts don't move, signals flow to devices that are able to convert the final result to analog (for instance, a digital TV will receive a broadcast signal, convert it to a certain channel and pass it on to the screen to display. Even screens such as plasma and LCD are ultimately analog - they must decide which dots (pixels) to display, in what color and what shade. The decision can be made digitally, controlling the nuances of the display in realtime.
Advantages disadvantages of realtime operating system?
There are several advantages and disadvantages of having a real time operating system. One disadvantage is unseen errors, an advantage is timing.
What are the different types of operating systems?
There can be an infinite number of "types", depending on how you want to classify them. Free or proprietary? Realtime? Unix-like? 16, 32, or 64-bit? Server, desktop, or embedded? By kernel type? This question can't really be answered without better context.
Difference between realtime and multiprocessor scheduling?
uniprocessor : - A type of architecture that is based on a single computing unit. All operations ( additions, multiplications, etc ) are done sequentally on the unit. . multiprocessor : - A type of architecture that is based on multiple computing units. Some of the operations ( not all, mind you ) are done in parallel and the results are joined afterwards.
When was Realtime Worlds created?
Realtime Worlds was founded in 2002.
When was Realtime Interrupt created?
Realtime Interrupt was created in 1995.
When was Realtime Associates created?
Realtime Associates was created in 1986.
When did Realtime Worlds end?
Realtime Worlds ended in 2010.
What is Realtime Worlds's population?
Realtime Worlds's population is 200.
How many pages does Marooned in Realtime have?
Marooned in Realtime has 270 pages.
When was Marooned in Realtime created?
Marooned in Realtime was created in 1986-09.
What is the ISBN of Realtime Interrupt?
The ISBN of Realtime Interrupt is 0-553-37454-0.
What is the ISBN of Marooned in Realtime?
The ISBN of Marooned in Realtime is 0-312-94295-8.
Is there a realtime earth search?
No
What actors and actresses appeared in Realtime - 2013?
The cast of Realtime - 2013 includes: Morne du Toit as John David Sherwood as Paul Walters
What is RT Linux kernel?
It is a kernel version that enables realtime.
