インテル® VTune™ Amplifier 2018 ヘルプ
The CPU time is low for one of the following reasons:
The analysis run was very short and the target consumed little CPU time.
CPU time may be inaccurate for targets that work in short quanta less than the scheduler tick interval. For example, this can happen for frame-by-frame computation in video decoders. To capture CPU time more accurately on Windows*, you need to run the analysis with the accurate CPU time detection mode enabled.
Try one of the following:
Extend the duration of the analysis run.
Enable accurate CPU time detection by checking the Collect highly accurate CPU time box in the Analysis Type configuration window. Make sure to extend maximum size of raw collector data.
Accurate CPU time collection produces a significant amount of temporary data depending on the system configuration and the profiled target. VTune Amplifier may generate up to 5 Mb of temporary data per minute per logical CPU.