Real-Time-Operating systems

geifx · Oct 6, 2004

I know there are some lynux operating systems that operate real time. What use do these real time operating systems have? Which real time os is the most realiable? Thanks

-gx

snakefoot · Oct 7, 2004

Any reason why you want to know this ?

Most desktop operating systems like Windows and Linux are real time. The level of reliability is mostly dependent on the quality of hardware in the computer.

geifx · Oct 7, 2004

Windows in not real time. I'm thinking of real time in terms of machine systems. I don't know how to explain what it is because i'm not sure what it is exactly. I can say for sure that windows is not real-time. I googled real time os's, and found out what os's are real-time, but I still don't understand the difference between windows(no real-time) and Blue Cat from lynux.

snakefoot · Oct 7, 2004

Seems that a Real time Operating System (RTOS) is one that (almost) doesn't interfere with the running application. So the application have (almost) full usage-control of the hardware (CPU,RAM,Network,Disc,Etc.) without being interfered by others.

Windows NT and Real-Time Operating Systems
This article was previously published under Q94265

SUMMARY
You can use a variety of criteria to measure the performance of a real-time system. The following are examples of the kinds of measurements that might be used to determine real-time throughput:

* Longest critical region that the kernel blocks task activation during a system call
* Maximum time that interrupts are disabled
* Context switch time (scheduler time to save/restore registers, etc.) for threads within the same process (no change in memory context) and for threads in different processes (save/restore memory context)
* Interrupt response time (latency between the occurrence and execution of the first instruction)
* Interrupt task response time (worst case task dispatch latency for task waiting on the interrupt)
* Performance of interprocess communication facilities (semaphores, queues, pipes, etc.)

Because such specifics are hard to measure, this article provides a general discussion of the suitability of Windows NT as a real-time system.

MORE INFORMATION
Users often want a total program development/GUI user environment, virtual memory, and so forth, without any corresponding reduction in response time. Real-time systems, however, are dedicated systems for the duration of an "event." During that time, the system is essentially locked, and no other activity can take place except that real-time event. (Note that very few situations demand microsecond or millisecond response time.)

Windows NT has the same basic structure as VMS. Windows NT has more efficient mechanisms than RSX-11M. It has a better design than VAXELN, which is a real-time embedded OS toolkit. All three of these systems are very successful.

Although Windows NT has good real-time capabilities; it is not designed to compete with a special purpose real-time system. If you need such a system, obtain the special real-time hardware and supporting operating system.
Click to expand...

Usually "true"(specially designed) RTOS are mostly used in small hardware devices, with limited functionality. An operating system (OS) designed to be used in hardware are also called embedded OS (Like Windows CE). If you want recommedations in this area then you should visit:

www.dedicated-systems.com

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Real-Time-Operating systems

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