Echtzeitsysteme at TU München

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Exemplary flashcards for Echtzeitsysteme at the TU München on StudySmarter:

Which types of memory architectures are there?

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Name 2 types of RT Database updates

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Name interfacings to sensors and actuators

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Exemplary flashcards for Echtzeitsysteme at the TU München on StudySmarter:

What is the problem with coherence? How can it be solved?

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How is the time difference between two microticks called

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Name 3 purposes of time measurement in cyber physical systems

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why is cache useful

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whaat to do when cache is full

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classification of rt systems

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Basic definition and functionalities of a OS

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what is the difference between the scheduler and the dispatcher

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what is the edf algorithm

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Exemplary flashcards for Echtzeitsysteme at the TU München on StudySmarter:

Echtzeitsysteme

Which types of memory architectures are there?

- Memory map

- Stack

- Heap

Echtzeitsysteme

Name 2 types of RT Database updates

- Time triggered

- Event triggered

Echtzeitsysteme

Name interfacings to sensors and actuators

- GPIO (digitalization of IO)

- ADC (sample/hold of input during conversion time, antialiasing necessary)

- PWM (deliver variable amounts of power to external devices. Duty cycle = proportion of high voltage to cycle time)

- DAC

Echtzeitsysteme

What is the problem with coherence? How can it be solved?

If multiple processes have their own cached version of a value and one gets changed, changes dont reflect to the other cached value. Single-Writer-Multiple-Reader solves this. For this, it is required to propagate memory locations correctly.

Echtzeitsysteme

How is the time difference between two microticks called

A granule


Echtzeitsysteme

Name 3 purposes of time measurement in cyber physical systems

• physical states can be derived from sensor values and time,
e.g. speed from change in position over time

actions, such as measurements or actuator commands may be
time dependent
• the order of events might be of interest or may have to be
enforced (e.g. fault finding, action sequences)

Echtzeitsysteme

why is cache useful

spatial locality



temporal locality

Echtzeitsysteme

whaat to do when cache is full


LRU Least Recently Used. Pick the slot that hasn't been used in the
longest time.
LFU Least Frequently Used. Pick the slot that has been used the least
often.
FIFO First In First Out. Pick the slot that has been in the cache the
longest (which is NOT the same as LRU).

Echtzeitsysteme

classification of rt systems


According to the consequences of the exceeding of limits: hard vs. soft real-
time systems
According to the execution model: time-controlled (cyclic, periodic) vs. event-
based (aperiodic)

Echtzeitsysteme

Basic definition and functionalities of a OS

• Extended Machine
- Simpler and easier to use than the underlying hardware
– Hides technical details
• Resource Manager
–Provide orderly and controlled allocation of processors, memory etc.
– Protection through separation of user mode and kernel mode
• Concepts: Processes, files, system calls

Echtzeitsysteme

what is the difference between the scheduler and the dispatcher

Scheduler:

makes plan and allocates ressources

Dispatcher:
Executes plan
switches context,switches user mode, jumps to proper location inside program

Echtzeitsysteme

what is the edf algorithm

earliest deadline first (absolute deadlines)

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