uarch-exploration Command Line Analysis

Use the uarch-exploration value to launch the Microarchitecture Exploration analysis (formerly known as General Exploration) that is a good starting point to triage hardware issues in your application. Once you have used Hotspots analysis to determine hotspots in your code, you can perform Microarchitecture Exploration analysis to understand how efficiently your code is passing through the core pipeline. During Microarchitecture Exploration analysis, Intel® VTune™ Amplifier collects a complete list of events for analyzing a typical client application. It calculates a set of predefined ratios used for the metrics and facilitates identifying hardware-level performance problems.

Syntax

$ amplxe-cl -collect uarch-exploration [-knob [knobName=knobValue]] [--] <target>

Knobs: collect-memory-bandwidth, pmu-collection-mode, dram-bandwidth-limits, sampling-interval, collect-frontend-bound, collect-bad-speculation, collect-memory-bound, collect-core-bound, collect-retiring.

By default, the Microarchitecture Exploration analysis runs in the detailed PMU collection mode and collects sub-metrics for all top-level metrics: CPU Bound, Memory Bound, Front-End Bound, Bad Speculation, and Retiring. If required, you may configure the knob option to disable collecting sub-metrics for a particular top-level metric.

Note

  • For the most current information on available knobs (configuration options) for the Microarchitecture Exploration analysis, enter:

    $ amplxe-cl -help collect uarch-exploration

  • The general-exploration analysis type value is deprecated. Make sure to use the uarch-exploration option instead.

Examples

This example runs the Microarchitecture Exploration analysis on a Linux* matrix app with enabled memory bandwidth analysis:

$ amplxe-cl -collect uarch-exploration -knob collect-memory-bandwidth=true -- /home/test/matrix

This example runs the Microarchitecture Exploration analysis on a Windows matrix app in the low-overhead summary profiling mode:

> amplxe-cl -collect uarch-exploration -knob pmu-collection-mode=summary -- C:\samples\matrix.exe

This example runs the Microarchitecture Exploration analysis on a Linux matrix app in the default detailed profiling mode but disables the collection of the sub-metrics for the Bad Speculation and Core Bound top-level metrics:

$ amplxe-cl -collect uarch-exploration -knob collect-bad-speculation=false -knob collect-core-bound=false -- /home/test/myApplication

What's Next

When the data collection is complete, do one of the following to view the result:

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