Use the CPU Frequency analysis to explore the processor frequency behavior: track frequency changes in the timeline and identify cores with the most time spent in the high frequency modes. Typically, spending more time in low frequency modes provides greater power savings.
VTune Amplifier displays the results of the CPU Frequency analysis in the CPU Frequency viewpoint where:
Summary window displays system-level statistics on the frequency behavior.
CPU Frequencies pane displays time spent in each frequency mode per core.
Timeline pane displays frequency transitions per core over time.
You may collect CPU frequency data and data on processor sleep states/wake-ups simultaneously. To do this, create a custom analysis type and make sure to enable both options Collect sleep data and Collect frequency data. In this case, the VTune Amplifier will provide collected results in both CPU Frequency and CPU Sleep States viewpoints.
Power analysis is supported only for Linux* OS based on Intel® Xeon® processors. On Windows* OS, you may import and view results collected on a Linux OS.
To enable the power analysis, make sure your environment has a file named
/boot/config-`uname -r`located in your
/boot/configdirectory. If this files does not exist, run the following command:
cat /proc/config.gz | gunzip - > /boot/config-`uname -r`.