Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem


CPU usage ?

Posted by Nobody/Anonymous on January 3, 2006

have freertos cpuusage for
1.max cpuusage
2. each rack cpuusage ?
3. stack address of each task to check normally
stack usage in run-time

and also i see freertos use write one const value in stack before use it
is nice
better if add function to chk change if this const value in run-time and report it
i agree is get some CPU usage but in optional run
and then report in debug time

RE: CPU usage ?

Posted by Richard on January 3, 2006
1) Depends on port, CPU MHz, compiler and tick frequency.

2) ?

3) Take a look at the function usTaskCheckFreeStackSpace() defined in task.c.


RE: CPU usage ?

Posted by Nobody/Anonymous on January 3, 2006
seems i dont true speak about my qustion ...

1)some os have one function see what present od cpu usage (max , avrage)

have you plan add to it to freertos ?

RE: CPU usage ?

Posted by Nobody/Anonymous on January 4, 2006
If you see UCOS II rtos source or ebook,It uses idle task hook function to calculate CPU usage for all tacks,
The method is:
In every one second ,calculate the time that you are in idle task ,so you can calculate persentage of idle time in each second and obtain cpu usage by subtacting it from 100%.

CPU Usage = ((1000msec - (idle time in msec))/1000)*100)

[ Back to the top ]    [ About FreeRTOS ]    [ Privacy ]    [ Sitemap ]    [ ]

Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News

Version 10.1.0 of the FreeRTOS kernel is available for immediate download. MIT licensed.

View a recording of the "OTA Update Security and Reliability" webinar, presented by TI and AWS.


FreeRTOS and other embedded software careers at AWS.

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Espressif ESP32

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers


STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

OpenRTOS and SafeRTOS

Xilinx Microblaze and Zynq partner