Core Port Saturation Analysis

Core Port Saturation analysis type uses event-based sampling collection and is targeted for the Intel® microarchitecture code name Sandy Bridge.

This analysis type uses events that help identify how port saturation affects the performance of your application at a per-core granularity.

To see the full list of events used for this analysis type:

  1. Click the New Analysis toolbar button.

    The Analysis Type window opens.

  2. From the left pane, select Microarchitecture Analysis > CPU Specific Analysis > Sandy Bridge Analysis > Core Port Saturation.

    The Core Port Saturation configuration pane opens on the right. The Details section provides a table with the processor events used for this analysis type.

You can choose to view Core Port Saturation analysis results in any of the following viewpoints:

Viewpoint

Description

Hardware Event Counts

Displays the event count for all collected processor events. While the Hardware Event Sample Counts viewpoint provides the actual number of samples collected for an event, Hardware Event Count viewpoint estimates the number of times this event occurred during the collection.

Hardware Event Sample Counts

Displays the sample count for all collected processor events. While the Hardware Event Counts viewpoint estimates the number of times an event occurred during the collection, the Hardware Event Sample Counts viewpoint provides the actual number of samples collected for this event.

Hotspots

Helps identify hotspots - code regions in the application that consume a lot of CPU time.

Task Time

Visualizes tasks, logical units of work on specific threads, based on ITT API annotations. Identify tasks with the highest execution time and analyze threads responsible for a particular task.

These viewpoints may include the following windows:

  • Summary window displays statistics on the overall application execution.

  • Bottom-up window displays performance data per metric (event ratio/event count/sample count) for each hotspot function.

  • Top-down Tree window displays hotspot functions in the call tree, performance metrics for a function only (Self value) and for a function and its children together (Total value).

  • Caller/Callee window displays parent and child functions of the selected focus function. This window is available only if stack collection was enabled during analysis configuration.

  • PMU Events window displays count for PMU events selected for the analysis.

  • Uncore Events window displays count for uncore events selected for the analysis. If there are no uncore events, the upper pane of the window is empty.

  • Tasks, Tasks over Time, and Tasks by Threads windows provide details on tasks specified in your code with the Task API.

For more complete information about compiler optimizations, see our Optimization Notice.