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https://github.com/zephyrproject-rtos/zephyr
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Some ARM platforms, now, enable HW Stack Protection by default in the Board definition. So if some tests need to run without stack protection, it is not sufficient to disable TEST_HW_STACK_PROTECTION; we need to explicitly disable HW_STACK_PROTECTION. Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no> |
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| boards | ||
| src | ||
| CMakeLists.txt | ||
| prj.conf | ||
| README.rst | ||
| testcase.yaml | ||
Latency Measurements
####################
This benchmark measures the latency of selected kernel capabilities, including:
* 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
Sample output of the benchmark::
*** 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