zephyr

History

Kumar Gala 9a87b8535e tests: benchmarks: latency_measure: Fix build issue with abs() We now have a define for abs() in stdlib, so we can remove the version implemented in the test. Signed-off-by: Kumar Gala <kumar.gala@linaro.org>		2018-01-25 01:27:22 -06:00
..
src	tests: benchmarks: latency_measure: Fix build issue with abs()	2018-01-25 01:27:22 -06:00
CMakeLists.txt	Introduce cmake-based rewrite of KBuild	2017-11-08 20:00:22 -05:00
README.txt	…
prj.conf	tests: add CONFIG_TEST for marking tests	2018-01-08 10:03:57 -05:00
prj_small_freq_divider.conf	tests: add CONFIG_TEST for marking tests	2018-01-08 10:03:57 -05:00
testcase.yaml	posix: enable benchmarks for other architectures	2017-12-27 14:16:08 -05:00

README.txt

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