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How to choose an RTOS
Introduction
• A real-time operating system (RTOS) is
an operating system (OS) intended to
serve real-time application pro...
Questions while choosing an RTOs
How large?
• Determining how much memory the embedded
system allows (i.e. how much and what type of
RAM is supported).
• T...
How Flexible?
1. Scheduling policies- Generally not more than
one policy is required in the application. E.g.
Preemptive, ...
3. Interrupts- Determining how the RTOS handles
interrupts and whether functions are supported.
4. Event Synchronization- ...
6. Application Programming Interface (API)-
Verify the APIs supported by the RTOS and if
it in particular supports the one...
How Fast?
• There are two basic types of RTOSs- hard and soft.
• A hard system is required when you have a situation
where...
How much?
• When considering the necessary budget for
implementing a RTOS, keep the following possible
costs in mind:
1. I...
Other Parameters
1. Safety
• Avoiding operator error
• Certification
2. Reliability
• Writing reliable software
• Having h...
3. Functionality
• Wireless connectivity
• USB
• Portability
• Thank You!
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How to choose an RTOS?

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Requirements and Parameters to be taken into consideration while choosing a Real Time Operating System

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How to choose an RTOS?

  1. 1. How to choose an RTOS
  2. 2. Introduction • A real-time operating system (RTOS) is an operating system (OS) intended to serve real-time application process data as it comes in, typically without buffering delays. • Processing time -tenths of seconds or shorter.
  3. 3. Questions while choosing an RTOs
  4. 4. How large? • Determining how much memory the embedded system allows (i.e. how much and what type of RAM is supported). • Then, there are two factors to consider :- 1) What memory is required by the RTOS itself. 2) How much memory the application requires. • Use an RTOS simulator to gain an accurate estimation, if we are working with a severely limited system.
  5. 5. How Flexible? 1. Scheduling policies- Generally not more than one policy is required in the application. E.g. Preemptive, Round Robin, Cooperative, Time-Sliced and Multivariate Slicing. 2. Runtime Behavior- Finding out if the RTOS supports dynamic objects at runtime. This will allow for greater flexibility in your code.
  6. 6. 3. Interrupts- Determining how the RTOS handles interrupts and whether functions are supported. 4. Event Synchronization- Finding out if the RTOS supports multiple tasks waiting on a single event and/or a single task waiting on multiple events. 5. Memory Management- Looking for the ability to create deterministic memory allocations so that we can avoid additional overhead associated with garbage cleanup and fragmentation.
  7. 7. 6. Application Programming Interface (API)- Verify the APIs supported by the RTOS and if it in particular supports the one needed by the application. 7. Messaging- Check the messaging options available for passing data between various objects.
  8. 8. How Fast? • There are two basic types of RTOSs- hard and soft. • A hard system is required when you have a situation where a task not meeting a deadline would result in a failure. • A soft system has no guarantee that the deadline would be met, but there is some window of reliability. • The response time is the measure of the hardness of a RTOS. The lower the response time, the better (harder) the RTOS. • The worst case of response time, the application can live with is determined by the amount of Jitter in the system.
  9. 9. How much? • When considering the necessary budget for implementing a RTOS, keep the following possible costs in mind: 1. Initial software license fees 2. Recurring license fees 3. Support Costs 4. Training Costs 5. Development labor costs (programmer, QA, manager, etc.)
  10. 10. Other Parameters 1. Safety • Avoiding operator error • Certification 2. Reliability • Writing reliable software • Having high-quality tools like an OS-aware debugger and performance profiler available with the selected RTOS can help produce reliable code.
  11. 11. 3. Functionality • Wireless connectivity • USB • Portability
  12. 12. • Thank You!
  • SaiVamsikrishna2

    Nov. 18, 2018
  • RamineniChowdary

    Apr. 13, 2018

Requirements and Parameters to be taken into consideration while choosing a Real Time Operating System

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