#67 vTaskGetRunTimeStats generate value > 100%

[Thomas Johansen]

I'm using the vTaskGetRunTimeStats to get runtime information of the tasks.
But 1 task starts out with CPU usage to more than 100 % (A huge number ex: 152354223%)
The value is decreasing over time and ends up where it should be.

The task is straight forward, it waits on a queue with a timeout of 5 sec. The priority is just like the other task

[pugglewuggle]

Did you guys ever find the answer to this? There doesn't seem to be any closing notes. I'm experiencing the same thing on 7.6.0.

It's showing 189% for me. The task does nothing but toggle a GPIO pin and vTask delay for 1 millisecond. Was using this for testing timing but I left it running and just happened to notice this.

void freq1kHzPremptTest(void* pvParameters){
    for(;;){
        gpio_toggle_pin(PIO_PA20_IDX);
        vTaskDelay(1/portTICK_RATE_MS);
    }
}

[pugglewuggle]

I'll also add that I just noticed even after power-off reset it is immediately over 100%. Haven't seen this before.

[pugglewuggle]

Dropping vTaskDelay to 2ms instead of 1ms makes everything report properly. Running @ 12MHz on CortexM4 so I don't know why that would make that big of a difference.

[Antoine]

I had the same problem on FreeRTOS and I found a solution.
For portCONFIGURE_TIMER_FOR_RUN_TIME_STATS () and portGET_RUN_TIME_COUNTER_VALUE () I had configured timer 16bits with 20kHz frequency
Now I have changed with 32bits timer and the problem is corrected.