42 lines
2.5 KiB
ReStructuredText
42 lines
2.5 KiB
ReStructuredText
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Latency Measurements
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####################
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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
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* Measure time from ISR to executing a different thread (rescheduled)
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* Measure average time to signal a semaphore then test that semaphore
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* Measure average time to signal a semaphore then test that semaphore with a context switch
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* Measure average time to lock a mutex then unlock that mutex
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* Measure average context switch time between threads using (k_yield)
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* Measure average context switch time between threads (coop)
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* Time it takes to suspend a thread
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* Time it takes to resume a suspended thread
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* Time it takes to create a new thread (without starting it)
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* 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 ***
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START - Time Measurement
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Timing results: Clock frequency: 120 MHz
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Average thread context switch using yield : 420 cycles , 3502 ns
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Average context switch time between threads (coop) : 429 cycles , 3583 ns
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Switch from ISR back to interrupted thread : 670 cycles , 5583 ns
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Time from ISR to executing a different thread : 570 cycles , 4750 ns
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Time to create a thread (without start) : 360 cycles , 3000 ns
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Time to start a thread : 545 cycles , 4541 ns
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Time to suspend a thread : 605 cycles , 5041 ns
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Time to resume a thread : 660 cycles , 5500 ns
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Time to abort a thread (not running) : 495 cycles , 4125 ns
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Average semaphore signal time : 195 cycles , 1626 ns
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Average semaphore test time : 62 cycles , 518 ns
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Semaphore take time (context switch) : 695 cycles , 5791 ns
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Semaphore give time (context switch) : 845 cycles , 7041 ns
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Average time to lock a mutex : 79 cycles , 659 ns
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Average time to unlock a mutex : 370 cycles , 3085 ns
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===================================================================
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PROJECT EXECUTION SUCCESSFUL
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