Quick Answer
Calculate Static WCET + Jitter-Aware RTOS Task Deadline Miss Probability Estimator
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Find Engineering Solutions →Result Interpretation
Static WCET + Jitter-Aware RTOS Task Deadline Miss Probability Estimator calculator computes Deadline Miss Probability in 1 using the defined engineering formula and the input values provided. No universal acceptance threshold is defined by this calculator.
Worked Example
Verified calculation
Given:
- Jitter Standard Deviation = 2
- Worst-Case Execution Time = 80
- Task CPU Utilization Ratio = 0.4
Expected Result:
- Deadline Miss Probability = 0.000625
Engineering Interpretation:
Under the given input conditions, the calculated result is: Deadline Miss Probability = 0.000625.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.
Formula / Method
deadline miss probability = 1.0 - exp(-pow(jitter standard deviation / worst-case execution time, 2) * (1.0 - task cpu utilization ratio))Formula family: formula_embedded_rtos_task_deadline_miss_probability_estimator_static_wcet_jitter_aware
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| jitter_std_us | Jitter Standard Deviation | INPUT | Jitter Standard Deviation |
| wcet_us | Worst-Case Execution Time | INPUT | Worst-Case Execution Time |
| utilization_ratio | Task CPU Utilization Ratio | INPUT | Task CPU Utilization Ratio |
| deadline_miss_probability | Deadline Miss Probability | OUTPUT | Deadline Miss Probability |
Calculation Steps
- Enter the jitter standard deviation in us.
- Enter the worst-case execution time in us.
- Enter the task cpu utilization ratio in 1.
- Step 1: Compute deadline miss probability.
- Read the deadline miss probability (1) from the results.
Engineering Summary
Calculate Static WCET + Jitter-Aware RTOS Task Deadline Miss Probability Estimator
Frequently Asked Questions
What does this calculator calculate?
The Static WCET + Jitter-Aware RTOS Task Deadline Miss Probability Estimator calculator estimates Deadline Miss Probability based on the input parameters you provide
Why is jitter standard deviation important in this calculation?
jitter standard deviation is used directly in the calculation of deadline miss probability. Its effect on the result depends on the complete formula and the values of the other inputs.. When you enter jitter standard deviation in us, the calculator uses it in the engineering formula to compute the output
How should I interpret the result deadline miss probability?
The calculator outputs deadline miss probability. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Jitter Standard Deviation (us), Worst-Case Execution Time (us). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
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