To access this pane:
Click the
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New Analysis button on the Intel® VTune™ Amplifier toolbar.The New Amplifier Result tab opens with the Analysis Type window active.
Select the Power Analysis > CPU Frequency analysis type from the analysis tree on the left pane.
The CPU Frequency pane opens on the right.
Note
Power analysis is available only with the Intel® VTune™ Amplifier for Systems, part of Intel System Studio. For Linux* platforms based on Intel Xeon® processors, use Power analysis types provided with the VTune Amplifier GUI. On Windows* OS, you may import and view results collected on a Linux platform. For Power analysis on Android* platforms, use the Intel® Energy Profiler tools to analyze power consumption for your system and identify causes of wake-ups that waste energy. To view the power analysis results collected on an Android system, use the VTune Amplifier for Systems graphical interface.
New Analysis button on the Intel® VTune™ Amplifier toolbar.Use this pane in the Analysis Type window to explore and edit the CPU Frequency analysis type configuration. The CPU Frequency analysis type uses the power analysis collector to analyze platform power consumption.
Use This | To Do This |
|---|---|
Details button | Expand/collapse a section listing the default non-editable settings used for this analysis type. If you want to modify the settings for the CPU Frequency analysis, you may right-click the CPU Frequency entry in the analysis tree and select Copy from Current from the context menu. VTune Amplifier creates an editable copy of this analysis type configuration and locates it under the Custom Analysis branch in the analysis tree. |
The Details section provides information on the following collection settings used for the CPU Frequency analysis:
Option | Description | Default CPU Frequency Value |
|---|---|---|
CPU sampling interval, ms | Specify the amount of time to wait before collecting each sample. | 10 milliseconds |
Collect CPU sampling data | Specify the type of sampling collection. | No |
Collect signalling API data | Enable to view synchronization transitions in the timeline and signalling call stacks for associated waits. The collector will instrument APIs, which causes higher overhead and increases result size. | No |
Collect synchronization API data | Enable to identify where threads are waiting or compute thread concurrency. The collector instruments APIs, which causes higher overhead and increases result size. | No |
Collect I/O API data | Specify how to collect data on input/output API calls. | No |
Analyze user task API data | Collect data on user tasks. The collector instrument user Task API, which causes higher overhead and increases result size. | No |
Stitch stacks | For applications using Intel Threading Building Blocks (Intel TBB) or OpenMP* with Intel runtime libraries, restructure the call flow to attach stacks to a point introducing a parallel workload. | Yes |
Collect timeline data | Collect and retain overtime data to display the Timeline pane. This mode increases the result size. | Yes |
Collect sleep data | Analyze when and what causes the hardware to wake up from a sleep state. This type of data collection is supported only on Linux* systems based on Intel Xeon® processors. | No |
Collect frequency data | Collect data about processor frequency changes. This type of data collection is supported only on Linux* systems based on Intel Xeon processors. | Yes |
To analyze information on the time spent in different frequency modes and sleep states per core, create a custom analysis and enable both the Collect sleep data and Collect frequency data options.