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winIDEA Help

Version: 9.21.36

Profiler CPU Load

An important metric in the analysis of embedded applications is the CPU idle time. The idle time is the amount of time the CPU is not busy. If the Operating System (OS) has an idle task the idle time is simply the amount of time the idle task is running.

 

CPU Load functionality displays the amount of time OS spent outside the idle task is running per-core and it visualizes the data in the Profiler Timeline window.  CPU Load is calculated on top of an existing recording, similar to Profiler Inspectors.

 

Requirements

  • OS
  • winIDEA 9.21.22 and newer

 

 

Configuring CPU Load

 

number1

Open Profiler Timeline.

CPULoad

1. Make sure your OS is properly configured.

2. Open View menu / Analyzer and press Profiler Timeline.

 

 

hmtoggle_arrow0 Here you can more information on how to configure your Operating System?

 

 

number2

Select and enable CPU Load.

CPULoad-2

1. Press Post Process in the Profiler Timeline.

2. Select CPU Load.

CPULoad-3

3. Check the Enable check box.

4. (Optional). Set the Period.

5. Close the dialog.

 

This configuration suffice for majority of use cases, since by default neutral tasks (displayed with green color) are considered the default ones.

 

 

number3

Further configuration.

Too calculate CPU Load for multiple tasks as "idle", you can additionally select from which tasks CPU Load should be calculated.

 

CPULoad-4

1. Check the Manual check box.

2. (Optional). Set the Period.

In the example the period is set to 5 ms, this means that if inside this period "idle"  task was active for 1ms, then CPU Load would show 80% since the 4 ms (80%) OS was executing some other task than "idle".

 

3. Close the dialog.

Click to enlarge

Results are displayed in the Profiler Timeline.

 

CPU Load is calculated per core (CPU0, CPU1) and the parent area (CPULoad) shows the average value of all cores.

 

 

Number4

Export data.

Refer to the Profiler Export chapter.

 

 

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More resources

hmtoggle_arrow0 Inspector Examples - CPU Utilization

 

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