zephyr

History

Sebastian Bøe 55ee53ce91 cmake: Prepend 'cmake_minimum_required()' into 'app' build scripts Prepend the text 'cmake_minimum_required(VERSION 3.8.2)' into the application and test build scripts. Modern versions of CMake will spam users with a deprecation warning when the toplevel CMakeLists.txt does not specify a CMake version. This is documented in bug #8355. To resolve this we include a cmake_minimum_required() line into the toplevel build scripts. Additionally, cmake_minimum_required is invoked from within boilerplate.cmake. The highest version will be enforced. This patch allows us to afterwards change CMake policy CMP000 from OLD to NEW which in turn finally rids us of the verbose warning. The extra boilerplate is considered more acceptable than the verbosity of the CMP0000 policy. Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>		2018-08-15 04:06:50 -07:00
..
src	tests: fix doxygen comments	2018-05-07 12:27:07 -04:00
CMakeLists.txt	cmake: Prepend 'cmake_minimum_required()' into 'app' build scripts	2018-08-15 04:06:50 -07:00
README.txt	…
prj.conf	benchmarks: latency_measure: Disable userspace for benchmarks	2018-05-31 08:48:07 -04:00
prj_small_freq_divider.conf	benchmarks: latency_measure: Disable userspace for benchmarks	2018-05-31 08:48:07 -04:00
testcase.yaml	tests: cleanup subsystem tests meta-data	2018-04-09 22:55:20 -04:00

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