| 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 |
| * Measure average time to alloc memory from heap then free that memory |
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| Sample output of the benchmark:: |
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| *** Booting Zephyr OS build zephyr-v2.6.0-1119-g378a1e082ac5 *** |
| START - Time Measurement |
| Timing results: Clock frequency: 1000 MHz |
| Average thread context switch using yield : 9060 cycles , 9060 ns |
| Average context switch time between threads (coop) : 9503 cycles , 9503 ns |
| Switch from ISR back to interrupted thread : 14208 cycles , 14208 ns |
| Time from ISR to executing a different thread : 9664 cycles , 9664 ns |
| Time to create a thread (without start) : 3968 cycles , 3968 ns |
| Time to start a thread : 12064 cycles , 12064 ns |
| Time to suspend a thread : 12640 cycles , 12640 ns |
| Time to resume a thread : 12096 cycles , 12096 ns |
| Time to abort a thread (not running) : 2208 cycles , 2208 ns |
| Average semaphore signal time : 8928 cycles , 8928 ns |
| Average semaphore test time : 2048 cycles , 2048 ns |
| Semaphore take time (context switch) : 13472 cycles , 13472 ns |
| Semaphore give time (context switch) : 18400 cycles , 18400 ns |
| Average time to lock a mutex : 3072 cycles , 3072 ns |
| Average time to unlock a mutex : 9251 cycles , 9251 ns |
| Average time for heap malloc : 13056 cycles , 13056 ns |
| Average time for heap free : 7776 cycles , 7776 ns |
| =================================================================== |
| PROJECT EXECUTION SUCCESSFUL |
