INTEL VTUNE SAMPLING PDF

Intel® VTune™ Amplifier uses kernel drivers to enable hardware event-based sampling and collect event-based sampling data from. During the hardware event-based sampling (EBS), also known as analysis in the sampling mode, the Intel® VTune™ Amplifier profiles your. To enable hardware event-based sampling analysis on your platform, the Intel® VTune™ Amplifier uses sampling drivers that require root.

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Sample Count – Hardware Events Window: Deprecated Tutorials The following tutorials are deprecated and have not been updated for the latest Intel VTune Amplifier release.

The memory overhead is also minimal.

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VTune – Wikipedia

The sampling interval value of 10ms multiplies the SAV for all events by 10 making them overflow 10 times less frequently. Bottom-up – Memory Usage Window: Use the build-driver script to build the saampling for your kernel.

See Also knob sampling-interval amplxe-cl option. Each group consists of events that can be collected simultaneously.

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Driver permissions [ default ]. Summary – Platform Power Analysis Window: Cannot Open Data Error Message: If required, install the driver.

Intel® VTune™ Amplifier Tutorials

Inaccurate Sum in the Grid Problem: This option ensures that during the collection the VTune Amplifier collects data only for the current user. Platform Power Analysis Window: This reduces the number of interrupts and the number of samples collected and written to disk.

Cannot Open Data Error Message: For more complete information about compiler optimizations, see our Optimization Notice. Cannot Find File Window: Note Some sample code is also available at https: This page was last edited on 1 Novemberat Event Count – Hardware Events Window: Graphics – Hotspots Window: Identify the hardware-related issues in your application such as data sharing, cache misses, branch vtunr, and others.

Sampling Interval

Options – Result Location Pane: Cannot Find File Window: Driver access group [ vtune default ] Set the driver vtunw group ownership to determine which set of users can perform the collection on the system. Summary – Memory Usage Window: This may yield seemingly impossible results, such as two million instructions retiring in 0 cycles for a rarely-seen driver.

Bottom-up – Memory Usage Window: VTune Amplifier provides the following options: See Also Getting Help. The following additional limitations are also possible for the driverless collection: Options – General Pane: For instance, if the duration of sampling time is more than 10 minutes, consider increasing the sampling interval to 50 milliseconds.

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Unexpected Paused Time Problem: Depending on your target system, you can manage the sampling drivers as follows: Identifying False Sharing Duration: VTune Amplifier sampling drivers are unavailable on the system.

For hardware event-based sampling types, the sampling interval serves as a simple SAV multiplier so that the default interval value of 1ms just leaves the SAV intact.

Analyzing Locks and Waits Duration: After installation, you can use the respective -vars. Skipped Stack Frames Problem: Unexpected Paused Time Problem: By default, the VTune Amplifier collector samples your target and does not analyze execution paths. Intel VTune Amplifier Pane: To restrict access, see the Driver permissions option below.

Driverless Event-Based Sampling Collection

Sample Count – Hardware Events Window: The tool can be also used to analyze thread and storage performance. The minimal value of the sampling interval for the user-mode sampling and tracing collection depends on the system:. Share Tweet Share Send. Allow Multiple Runs or Multiplex