Intel Graphics Performance Analyzers > EUs Stalled on Samp.

• Intel® Graphics Performance Analyzers Help
  • Overview
  • New in Release 2012
  • Intel® GPA Updates
  • Best Practice
  • Product Website and Support
  • Intel® GPA Monitor
    • Introduction to the Intel® GPA Monitor
    • Graphical User Interface
      • Monitor Context Menu
      • Analyze Application Dialog Box
      • Profiles... Dialog Box
      • Preferences... Dialog Box
      • Log... Window
      • About... Window
      • Media Performance Dialog Box
    • Using Intel® GPA Monitor
      • Launching an Application
      • Launching the Intel® GPA Tools
      • Starting Application Analysis Automatically
      • Creating a Profile
      • Assigning a Profile to the Applications
      • Using Profiles Created with Earlier Versions of the Tool
      • Modifying a Profile
        • Changing the Profile Name
        • Enabling Tracing in Your Application
        • Setting up Tracing Options
        • Setting up a Trigger
        • Selecting Domains to be Traced
        • Customizing the Keyboard-shortcut Assignments
        • Configuring Metrics to Be Collected
        • Configuring HUD Display Options
      • Analyzing Media Workloads
        • About Performance Analysis of GPU-accelerated Media Applications
        • Analyzing a GPU-accelerated Media Application Performance
          • Monitoring Media Performance Metrics in Real Time
          • Analyzing Real-time Media Performance Metrics
          • Creating a Media Performance Trace Capture File
      • Viewing the Intel® GPA Monitor System Information
  • Intel® GPA System Analyzer Heads-up Display
    • Introduction to the Intel® GPA System Analyzer HUD
    • Graphical User Interface
      • Summary Field
      • Metrics Charts
      • Messages Field
      • Default Keyboard-shortcut Assignments
    • Using Intel GPA System Analyzer HUD
      • Analyzing Metrics
      • Creating a Frame Capture File
      • Creating a Trace Capture File
      • Creating an Intel® Graphics Checker Data Capture
      • Capturing a Specific Frame/Trace File in the Application
      • Using the Pause/Play Keyboard Shortcuts
      • Optimizing Graphics-rich Web Content
      • Changing a D3D Device for the Instrumented Process
      • Finding Performance Bottlenecks Using Override Modes
        • Override Modes Overview
        • Using Override Modes
          • Disable all Overrides, Null Hardware and Disable Draw Calls
          • Wireframe
          • 2x2 Texture
          • Simple Pixel Shader
          • 1x1 Scissor Rect
          • Disable Texture Filtering
          • Disable Z-Test, Disable Z-Write
          • Cull None, Cull Clockwise, Cull Counter-Clockwise
          • Disable Alpha Blending
          • Disable Alpha Test
          • Overdraw Visualization
          • FPS Limit
      • Finding the Exact Frame in the Application
      • Exporting Metrics
      • Creating a Frame and Trace Capture Files
  • Intel® GPA Frame Analyzer
    • Introduction to the Intel® GPA Frame Analyzer
    • Graphical User Interface
      • About the Graphical User Interface
      • Menu
        • File Menu
        • Edit Menu
        • View Menu
        • Advisor Menu
        • Help Menu
      • Visualization Settings Tool Bar
      • Visualization Panel
      • Scene Overview Panel
      • Render Target Viewer
        • Render Target Viewer Overview
        • Render Target View
        • Render Target Thumbnail List
        • Visualization Configuration Options
          • Visualization Configuration Options Overview
          • View
          • Selected Ergs
          • Non-Selected Ergs
        • Zoom in and Zoom out Buttons
        • Image Information Bar
        • Histogram
      • Tabs
        • Frame Overview Tab
        • Details Tab
        • Texture Tab
        • State Tab
        • Shaders Tab
        • Experiments Tab
        • Pixel History Tab
        • Erg Advisor Tab (Beta)
        • API Log Tab
      • Ergs Information
    • Using the Intel® GPA Frame Analyzer
      • Loading a Frame Capture File
      • Importing and Exporting Frame Capture Files
      • Configuring the Bar Chart
      • Analyzing the Graphics Application Performance
        • Discovering How Much Time the Graphics Application Spends within Each Pass
        • Discovering the Most Expensive Ergs
        • Running Experiments
        • Modifying DirectX* State
        • Modifying the Shader Code
        • Determining whether Texture Bandwidth is a Performance Bottleneck
        • Minimizing Overdraw
      • Investigating Ergs-based Issues with the Erg Advisor (Beta)
      • Investigating Frame-based Issues with the Frame Advisor (Beta)
      • Saving the Render Target Image
      • Saving the Texture Image
      • Saving the Pixel History Image
      • Viewing API Details
    • D3D Events and Markers
  • Intel® GPA Platform Analyzer
    • Introduction to the Intel® GPA Platform Analyzer
    • Symbol Resolution for Function Tasks
    • Tracing Data
    • Defining Styles for Tasks and Markers
    • Graphical User Interface
      • Docking User Interface
      • GUI Layout
      • Task Timeline
        • About the Task Timeline
        • Basic Concepts
        • Time Ruler
        • Aggregate Track
        • DX CPU and GPU Threads
        • Logical Tracks
        • Queue Tasks
        • Custom Tasks
        • Software Thread View
        • Hardware Thread View
      • Stacked Task View
      • Layout of the Media Performance Trace Capture File
      • Menu
        • File Menu
        • View Menu
        • Tracks Menu
        • Panels Menu
          • Available Panels
          • Task Groups
          • Statistics
          • Summary
          • Task Tree
          • Markers
          • Relation
          • Metadata
        • Window Menu
        • Help Menu
      • Auxiliary Buttons
      • Search Toolbar
    • Using the Intel® GPA Platform Analyzer
      • Loading a Trace Capture File
      • Loading Multiple Trace Capture Files
      • Importing and Exporting Trace Capture Files
      • Navigating the Task Timeline
      • Selecting Tasks
      • Showing/Hiding Hardware Tracks
      • Viewing Stacked Tasks
      • Disabling Undesirable Task Tracks
      • Enabling Hidden Task Tracks
      • Sorting the Task Tracks Order
      • Viewing Queue Track Tasks Instrumented with States
      • Displaying Aggregated Tasks with the Same Name
      • Analyzing a Media Performance Trace Capture File
      • Viewing the Trace Capture File Information
      • Analysis Workflows
        • I See Lots of Traced Data – Where Is the Majority of Time Being Spent?
        • Why Is this Task Longer in Duration than I Expect?
  • Intel® Graphics Checker Data Capture
    • Analyzing the Intel® Graphics Checker Data Capture
  • Troubleshooting
    • Basic Troubleshooting Tips
    • Troubleshooting the Intel® GPA Monitor
    • Troubleshooting the Intel® GPA System Analyzer HUD
    • Troubleshooting the Intel® GPA Platform Analyzer
    • Troubleshooting the Intel® GPA Frame Analyzer
  • Metrics Descriptions
    • Metrics List for Intel® Graphics Performance Analyzers
    • Extended Metrics Description
      • Compute Shader Metrics
        • CS Invocations
        • UAV Typed Reads
        • UAV Typed Writes
        • UAV Typed Atomic Ops
        • UAV Untyped Reads
        • UAV Untyped Writes
        • SLM Reads
        • SLM Writes
      • CPU Metrics
        • Aggregated CPU Load
        • Application Time
        • CPU n Load
        • Target App CPU Load
      • DirextX* Metrics
        • Buffer Creations
        • Buffer Maps
        • Clears
        • Color Fills
        • Draw Calls
        • Frames per Second
        • Frame Number
        • Frame Time
        • IB Creations
        • IB Lock Time
        • IB Locks
        • Locks
        • Lock Time
        • Maps
        • Resource Copy
        • Resource Creations
        • RT Changes
        • RT Clears
        • RT Data Gets
        • Shader Creations
        • State Block Applies
        • State Block Captures
        • State Changes
        • Stretch Rects
        • Surface Creations
        • Surface Lock Time
        • Surface Locks
        • Surface Updates
        • Subresource Copy
        • Subresource Update
        • Texture1D Maps
        • Texture2D Maps
        • Texture3D Maps
        • Texture Creations
        • VB Creations
        • VB Lock Time
        • VB Locks
        • Volume Lock Time
        • Volume Locks
        • Z/Stencil Clears
        • Memory Read Rate
        • Memory Write Rate
        • Memory R/W Rate
      • Execution Units Metrics
        • EUs Active in CS
        • EUs Active in DS
        • EUs Active in GS
        • EUs Active in HS
        • EUs Active in PS
        • EUs Active in VS
        • EUs Stalled in CS
        • EUs Stalled in DS
        • EUs Stalled in GS
        • EUs Stalled in HS
        • EUs Stalled in PS
        • EUs Stalled in VS
        • GPU EUs Active
        • GPU EUs Busy
        • GPU EUs Idle
        • GPU EUs Stalled
        • EUs Stalled on DAP
        • EUs Stalled on Math
        • EUs Stalled on Samp.
      • Geometry Shader Metrics
        • GS Invocations
        • Post-GS Primitives
      • GPU Metrics
        • GPU Busy
        • HUD Overhead Time
        • Non-Culled Polygons
        • PS Threads
        • RT Sub-Span Writes
        • Sampler Active
        • Texels Sampled
        • Texture Memory Reads
        • Z-Buffer Throughput
      • Input-Assembler Metrics
        • Primitive Count
        • Vertex Count
      • Main Metrics
        • GPU Duration
        • GPU Frequency
        • CS Duration
        • DS Duration
        • GS Duration
        • HS Duration
        • PS Duration
        • VS Duration
        • GS Is Bottleneck
        • VS Is Bottleneck
      • Memory Metrics
        • Texture Reads
        • GPU Memory Writes
        • GPU Memory Reads
      • Output-Merger Metrics
        • Alpha Tests Failed
        • Blended Pixels
        • Pixels Rendered
        • Sampler Is Bottleneck
      • Pixel Shader Metrics
        • PS Invocations
        • PS Killed Pixels
      • Power Metrics
        • CPU Power
        • GPU Power
        • Socket Power
      • Rasterizer Metrics
        • Clipper Active
        • Clipper Invocations
        • Post-Clip Primitives
        • Prim. Setup Active
      • Tesselation Metrics
        • Samples Written
        • DS Invocations
        • HS Invocations
      • Texture Sampler Metrics
        • Post-Filter Texels
        • Sampler Busy
      • Adding Basic Intel® ITT Instrumentation to Your Application
      • Minimizing Intel® ITT API Overhead
      • Unicode Support
  • Intel ® ITT API Programmer’s Guide
    • Marking up Your Application for Viewing in the Intel(R) GPA Platform Analyzer
    • Compiling and Linking with Intel® ITT
      • Configuring Your Build System
      • Including the Intel® ITT API Header in Your Application
      • Linking the Intel® GPA SDK Static Library to Your Application
    • API Reference
      • Custom Tracks and Track Groups
        • Custom_Tracks and Track Groups Overview
        • Functions
          • __itt_track_create
          • __itt_track_group_create
          • __itt_set_track
        • Enumerations
          • __itt_track_group_type
          • __itt_track_type
      • Domains
        • Domains Overview
        • Functions
          • __itt_domain_create
      • Frames
        • Frames Overview
        • Functions
          • __itt_frame_begin_v3
        • Enumerations
          • __itt_metadata_type
          • __itt_scope
        • Functions
          • __itt_metadata_add
          • __itt_metadata_str_add
          • __itt_metadata_add_with_scope
          • __itt_metadata_str_add_with_scope
      • Miscellaneous
        • Functions
          • __itt_thread_set_name
      • Named Entities and Instances
        • Named Entities and Instances Overview
        • IDs
          • IDs Overview
          • Functions
            • __itt_id_create
            • __itt_id_make
        • Task Groups
          • Task Groups Overview
          • Functions
            • __itt_task_group
        • Task States
          • Task States Overview
        • Tasks
          • Tasks Overview
          • Functions
            • __itt_task_begin
            • __itt_task_begin_fn
            • __itt_task_end
        • Markers
          • Markers Overview
          • Functions
            • __itt_marker
      • Relations
        • Relations Overview
        • Enumerations
          • __itt_relation
        • Functions
          • __itt_relation_add
          • __itt_relation_add_to_current
      • String Handles
        • String Handles Overview
        • Functions
          • __itt_string_handle_create
      • Functions List
      • Enumerations List
  • Disclaimer and Legal Information