42 lines
2.4 KiB
Plaintext
42 lines
2.4 KiB
Plaintext
|
Title: Latency Measurement
|
||
|
|
|
||
|
|
Description:
|
||
|
|
|
||
|
|
This benchmark measures the latency of selected capabilities
|
||
|
|
|
||
|
|
IMPORTANT: The sample output below was generated using a simulation
|
||
|
|
environment, and may not reflect the results that will be generated using other
|
||
|
|
environments (simulated or otherwise).
|
||
|
|
|
||
|
|
|
||
|
|
Sample Output:
|
||
|
|
|
||
|
|
***** BOOTING ZEPHYR OS v1.7.99 - BUILD: Mar 24 2017 22:46:05 *****
|
||
|
|
|-----------------------------------------------------------------------------|
|
||
|
|
| Latency Benchmark |
|
||
|
|
|-----------------------------------------------------------------------------|
|
||
|
|
| tcs = timer clock cycles: 1 tcs is 10 nsec |
|
||
|
|
|-----------------------------------------------------------------------------|
|
||
|
|
| 1 - Measure time to switch from ISR back to interrupted thread |
|
||
|
|
| switching time is 12591 tcs = 125910 nsec |
|
||
|
|
|-----------------------------------------------------------------------------|
|
||
|
|
| 2 - Measure time from ISR to executing a different thread (rescheduled) |
|
||
|
|
| switch time is 8344 tcs = 83440 nsec |
|
||
|
|
|-----------------------------------------------------------------------------|
|
||
|
|
| 3 - Measure average time to signal a sema then test that sema |
|
||
|
|
| Average semaphore signal time 63 tcs = 638 nsec |
|
||
|
|
| Average semaphore test time 49 tcs = 498 nsec |
|
||
|
|
|-----------------------------------------------------------------------------|
|
||
|
|
| 4- Measure average time to lock a mutex then unlock that mutex |
|
||
|
|
| Average time to lock the mutex 107 tcs = 1078 nsec |
|
||
|
|
| Average time to unlock the mutex 92 tcs = 929 nsec |
|
||
|
|
|-----------------------------------------------------------------------------|
|
||
|
|
| 5 - Measure average context switch time between threads using (k_yield) |
|
||
|
|
| Average thread context switch using yield 110 tcs = 1107 nsec |
|
||
|
|
|-----------------------------------------------------------------------------|
|
||
|
|
| 6 - Measure average context switch time between threads (coop) |
|
||
|
|
| Average context switch time is 88 tcs = 882 nsec |
|
||
|
|
|-----------------------------------------------------------------------------|
|
||
|
|
===================================================================
|
||
|
|
PROJECT EXECUTION SUCCESSFUL
|