Intel® Advisor User Guide

User Guide

Contents

Window: GPU Roofline Regions

Use the
GPU Roofline Regions
 window to view GPU metrics for your kernels in the grid, visualize kernel performance and identify room for optimization using a GPU Roofline chart, and view detailed information about how well a specific kernel utilizes compute and memory bandwidth.
Review the controls available in the main report of the
GPU Roofline Insights
 perspective of
Intel® Advisor
. In the
GPU Roofline Regions
 and
Summary
 tabs, you can drag-and-drop, close/open, collapse/expand panes to change the report layout.
  • Switch between perspectives using a drop-down menu in the top left corner.
  • Switch between
    Summary
    ,
    GPU Roofline Regions
    , and
    Source View
    .
Review the summary metrics for parts of your application executed on an accelerator.
  • Expand/collapse a top slider with per-program recommendations using the button.
    You can expand or collapse each recommendation.
  • Expand/collapse a top slider with collection event log using the button. The top slider enables you to view the following:
    • Main data collection events and issues in the
      Featured Events
       pane.
      Expand/collapse each featured event in the log to view details.
    • Application Output
    • Full execution log of your application in the
      Collection Log
       pane.
    Click the button to collapse the top slider or drag it to maximize the event log.
    Collection event log top slider appears automatically when you run a perspective. You can track collection using the green progress bar at the top and view collection events online.
  • Create a snapshot for the current project results using the button. For details, see Create a Read-only Result Snapshot .
  • Click a
    +
     button to open previously closed panes. With this button, you can add the following panes:
    • CPU Roofline
       pane that enables you to view the actual performance of functions/loops executed on a CPU against hardware-imposed performance ceilings visualized on a Roofline chart.
      For details about interpretation, see Examine Bottlenecks on CPU Roofline Chart .
    • CPU
       pane that enables you to review performance metrics of your application performance on a CPU and compare tem with performance metrics on an accelerator. For details, see CPU Metrics .
Review the actual performance of GPU kernels in your application against hardware-imposed performance ceilings using the
GPU Roofline
 chart.
For details about interpretation, see Examine Bottlenecks on GPU Roofline Chart .
See detailed description of GPU Roofline chart controls in Pane: GPU Roofline Chart.
Use the
GPU Details
 tab to view the detailed information about the execution of a selected kernel:
  • View program metrics for a selected kernel in the
    Summary
     pane.
  • Identify the memory level your selected kernel is bounded by using the
    Roofline Guidance
     pane.
  • Explore the compute operations count and memory level utilization metrics in the
    OP/S and Bandwidth
     pane. Use the drop-downs to view the operations count, memory traffic, and arithmetic intensity (AI) for floating-point and integer operations at different memory levels.
  • View how the selected kernel impacts each memory level and explore the amount of data passed through each memory level using the
    Memory Metrics
     pane.
  • Explore the ratio of compute, memory and other instructions grouped by types in the
    Instruction Mix
     pane.
  • Get detailed overview of instruction types used during the execution of your application using the
    Instruction Mix Details
     pane. Use the drop-downs to expand each instruction category and view the included instruction types and instruction count. For compute category,
    Intel Advisor
     determines the data type. The dominating data type in th entire kernel is highlighted blue. Filter instructions by type and dominating data type using a filter button.
  • View how th loops in a selected kernel utilize the execution unit (EU) in the
    Performance Characteristics
     pane.
Switch between
GPU Source
 and
GPU Assembly
 tabs to:
  • Examine the source code and offload details for each source line. Select a loop in the
    GPU
     table or a dot in the
    GPU Roofline
     to focus on the corresponding parts of source and assembly code.
  • Review GPU assembly representation for a selected kernel. Select a code line to highlight the corresponding part in source code.
For details about interpreting
GPU Roofline Insights
 perspective results, see Explore GPU Roofline Results
Use the
Recommendations
 tab to view actionable recommendations helping you improve performance of the currently selected kernel. Expand a recommendation to view more information and a code snippet.
Review performance metrics of your application performance on a GPU accelerator. For details about metrics, see Accelerator Metrics .

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.