DIFFERENCE BETWEEN RTOS AND GPOS PDF

They are much better suited for use in embedded systems as opposed to General Purpose Operating Systems GPOS , and, in many cases, are far easier to work with. General Purpose Operating System A General Purpose Operating System GPOS is an essential component of any mobile device, server, or computer system, and is responsible for running all the applications in an installation. GPOS is great for performing multiple tasks at the same time, but issues with latency and synchronization make them less than ideal for time-sensitive applications. Processing time must be far shorter than in a GPOS, and the execution pattern for applications and processes needs to be predictable.

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Example:- Windows, Linux, Unix etc. Example:- VxWorks, uCos etc. GPOS is programmed to handle scheduling in such a way that it manages to achieve high throughput. Here throughput means — the total number of processes that complete their execution per unit time. In such a case, sometimes execution of a high priority process will get delayed in order to serve 5 or 6 low priority tasks.

High throughput is achieved by serving 5 low priority tasks than by serving a single high priority one. Most RTOS uses pre-emptive task scheduling method which is based on priority levels. Here a high priority process gets executed over the low priority ones.

A high priority process execution will get override only if a request comes from an even high priority process. The more number of threads to schedule, latencies will get added up!

The more threads in the system, the longer it takes for the GPOS to schedule a thread for execution. Consequently a high priotrity user thread can never preempt a kernel call but must instead wait for the entire call to complete, even if the call was invoked by the lowest priority process in the system.

A system can be of a single purpose or multiple purpose. Here an ATM card user is supposed to get his money from the teller machine within 4 or 5 seconds from the moment he presses the confirmation button.

The card user will not wait 5 minutes at the ATM after he pressed the confirm button. So an ATM is a time critical system. Where as a personal computer PC is not a time critical system. The purpose of a PC is multiple. A user can run many applications at the same time.

After pressing the SAVE button of a finished document, there is no particular time limit that the doc should be saved within 5 seconds.

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DIFFERENCE BETWEEN RTOS AND GPOS PDF

So I am rewriting this post so that most of you can benefit. I had read a lots of articles to compose this material. There is not short-cut for a good answer. If you want to really know the topic spend mins to read and understand it. I have tried to go from layman terms to more technical stuff. Are ROTSs really fast? Many Embedded interviewer ask this question.

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What is the main difference between GPOS and RTOS?

Example:- Windows, Linux, Unix etc. Example:- VxWorks, uCos etc. GPOS is programmed to handle scheduling in such a way that it manages to achieve high throughput. Here throughput means — the total number of processes that complete their execution per unit time. In such a case, sometimes execution of a high priority process will get delayed in order to serve 5 or 6 low priority tasks. High throughput is achieved by serving 5 low priority tasks than by serving a single high priority one.

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GPOS versus RTOS for an Embedded System

A system can be of a single purpose or multiple purpose. Here an ATM card user is supposed to get his money from the teller machine within 4 or 5 seconds from the moment he press the confirmation button. The card user will not wait 5 minutes at the ATM after he pressed the confirm button. So an ATM is a time critical system. Where as a personal computer PC is not a time critical system.

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