Running disk-io Analysis from the Command Line

This analysis type uses the hardware event-based sampling collection and system-wide Ftrace* collection to provide a consistent view of the storage sub-system combined with hardware events and an easy-to-use method to match user-level source code with I/O packets executed by the hardware.

The analysis actively relies on the data produced by the kernel block driver system. In case your platform utilizes a non-standard block driver sub-system (for example, user-space storage drivers), disk metrics will not be available in the analysis type.

Use the Disk Input and Output analysis to identify:

• Imbalance between I/O and compute operations (HPC applications)

• Long latency of I/O requests (transactional workloads)

• Hardware utilization (streaming)

Syntax:

$ amplxe-cl -collect disk-io [-- target] [target_options]

Knobs: none.

Prerequisites:

• Run the VTune Amplifier command line interface with root privileges.
• Enable system-wide profiling:
  • For system analysis WITH a target application or process specify your application or process and enable system-wide analysis with the -analyze-system option.
  • For system analysis WITHOUT a target application or process specify the collection duration with the -duration option.

What's Next

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

• Use the -report action to view the data from command line.

• Use the -report-output action to write report to a .txt or .csv file

• Open the data collection result (*.amplxe) in the VTune Amplifier graphical interface.