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esp-idf/examples/system/freertos/real_time_stats
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fl0wl0w 90d1dcfd76 feat(freertos): Introduced new Kconfig option CONFIG_FREERTOS_NUMBER_OF_CORES 
This commit replaces the use of portNUM_PROCESSORS and configNUM_CORES
macros in all of ESP-IDF. These macros are needed to realize an SMP
scenario by fetching the number of active cores FreeRTOS is running on.
Instead, a new Kconfig option, CONFIG_FREERTOS_NUMBER_OF_CORES, has been
added as a proxy for the FreeRTOS config option, configNUMBER_OF_CORES.
This new commit is now used to realize an SMP scenario in various places
in ESP-IDF.

[Sudeep Mohanty: Added new Kconfig option CONFIG_FREERTOS_NUMBER_OF_CORES]

Signed-off-by: Sudeep Mohanty <sudeep.mohanty@espressif.com>
2024-02-09 09:11:28 +01:00
..
main feat(freertos): Introduced new Kconfig option CONFIG_FREERTOS_NUMBER_OF_CORES 2024-02-09 09:11:28 +01:00
CMakeLists.txt tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
pytest_freertos_real_time_stats.py system: re-enable esp_event, real_time_stats and pthread examples and test for C2 2022-06-23 02:05:46 +00:00
README.md feat(ci): Enable p4 example, test_apps and unit tests CI build 2023-08-24 12:51:19 +08:00
sdkconfig.ci change(freertos): Update real_time_stats example to use configRUN_TIME_COUNTER_TYPE 2023-10-31 15:44:37 +08:00
sdkconfig.defaults change(freertos): Update real_time_stats example to use configRUN_TIME_COUNTER_TYPE 2023-10-31 15:44:37 +08:00

README.md

Supported Targets ESP32 ESP32-C2 ESP32-C3 ESP32-C6 ESP32-H2 ESP32-P4 ESP32-S2 ESP32-S3

FreeRTOS Real Time Stats Example

(See the README.md file in the upper level 'examples' directory for more information about examples.)

FreeRTOS provides the function vTaskGetRunTimeStats() to obtain CPU usage statistics of tasks. However, these statistics are with respect to the entire runtime of FreeRTOS (i.e. run time stats). Furthermore, statistics of vTaskGetRunTimeStats() are only valid whilst the timer for run time statistics has not overflowed.

This example demonstrates how to get CPU usage statistics of tasks with respect to a specified duration (i.e. real time stats) rather than over the entire runtime of FreeRTOS. The print_real_time_stats() function of this example demonstrates how this can be achieved.

How to use example

Hardware Required

This example should be able to run on any commonly available ESP32 development board.

Configure the project

idf.py menuconfig

  • Select Enable FreeRTOS to collect run time stats under Component Config > FreeRTOS (this should be enabled in the example by default)

  • Choose the clock source for run time stats configured under Component Config > FreeRTOS. The esp_timer should be selected be default. This option will affect the time unit resolution in which the statistics are measured with respect to.

Build and Flash

Build the project and flash it to the board, then run monitor tool to view serial output:

idf.py -p PORT flash monitor

(Replace PORT with the name of the serial port to use.)

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

The example should have the following log output:

...
Getting real time stats over 100 ticks
| Task | Run Time | Percentage
| stats | 1304 | 0%
| IDLE0 | 206251 | 10%
| IDLE1 | 464785 | 23%
| spin2 | 225389 | 11%
| spin0 | 227174 | 11%
| spin4 | 225303 | 11%
| spin1 | 207264 | 10%
| spin3 | 225331 | 11%
| spin5 | 225369 | 11%
| Tmr Svc | 0 | 0%
| esp_timer | 0 | 0%
| ipc1 | 0 | 0%
| ipc0 | 0 | 0%
Real time stats obtained
...

Example Breakdown

Spin tasks

During the examples initialization process, multiple spin tasks are created. These tasks will simply spin a certain number of CPU cycles to consume CPU time, then block for a predetermined period.

Understanding the stats

From the log output, it can be seen that the spin tasks consume nearly an equal amount of time over the specified stats collection period of print_real_time_stats(). The real time stats also display the CPU time consumption of other tasks created by default in ESP-IDF (e.g. IDLE and ipc tasks).