| Latency Measurements |
| #################### |
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| This benchmark measures the latency of selected kernel capabilities, including: |
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| * Measure time to switch from ISR back to interrupted thread |
| * Measure time from ISR to executing a different thread (rescheduled) |
| * Measure average time to signal a semaphore then test that semaphore |
| * Measure average time to signal a semaphore then test that semaphore with a context switch |
| * Measure average time to lock a mutex then unlock that mutex |
| * Measure average context switch time between threads using (k_yield) |
| * Measure average context switch time between threads (coop) |
| * Time it takes to suspend a thread |
| * Time it takes to resume a suspended thread |
| * Time it takes to create a new thread (without starting it) |
| * Time it takes to start a newly created thread |
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| Sample output of the benchmark:: |
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| *** Booting Zephyr OS build zephyr-v2.3.0-2257-g0f420483db07 *** |
| START - Time Measurement |
| Timing results: Clock frequency: 120 MHz |
| Average thread context switch using yield : 420 cycles , 3502 ns |
| Average context switch time between threads (coop) : 429 cycles , 3583 ns |
| Switch from ISR back to interrupted thread : 670 cycles , 5583 ns |
| Time from ISR to executing a different thread : 570 cycles , 4750 ns |
| Time to create a thread (without start) : 360 cycles , 3000 ns |
| Time to start a thread : 545 cycles , 4541 ns |
| Time to suspend a thread : 605 cycles , 5041 ns |
| Time to resume a thread : 660 cycles , 5500 ns |
| Time to abort a thread (not running) : 495 cycles , 4125 ns |
| Average semaphore signal time : 195 cycles , 1626 ns |
| Average semaphore test time : 62 cycles , 518 ns |
| Semaphore take time (context switch) : 695 cycles , 5791 ns |
| Semaphore give time (context switch) : 845 cycles , 7041 ns |
| Average time to lock a mutex : 79 cycles , 659 ns |
| Average time to unlock a mutex : 370 cycles , 3085 ns |
| =================================================================== |
| PROJECT EXECUTION SUCCESSFUL |
