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http://software.intel.com/en-us/articles/Game-Developers-Conference-Europe-2011/
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“MAXIS-mizing” Darkspore game performance with Intel® GPA!
Philipp Gerasimov, Intel
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Agenda
• Quick Intro to GPA 4.1
• Sneak Peek of Darkspore
• Live demo of GPA
• Q & A
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Intel Graphics Performance Analyzers 4.1
4
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Intel GPA helps you analyze and tune your game for performance
View system wide picture of CPU and GPU workload.
5
System Analyzer HUD
Frame Analyzer
Platform Analyzer
In-game analysis using state overrides and real-time metrics graphs
Deep frame analysis down to the draw call level, incl. shaders, textures, D3D states, pixel history
Best price:
0.00 Euro
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Where to get Intel GPA?
6
www.intel.com/software/gpa
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Here‟s how to use Intel GPA 4.x
7
Target Game with HUD
If CPU bound, use Platform Analyzer or other CPU profiling
tools like VTune
If GPU bound, use Frame Analyzer
DirectX 9, 10/10.1, 11
WinXP/Vista/Win7 32/64bit
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New features in Intel GPA 4.1
• Improved workflow with global profiles
• Enable / Disable overrides with same hot-key
8
Just released
HUD / Monitor
Frame Analyzer
• CPU context switches visualization• Per-thread processor affinity tracks• Large trace files support (up to 2Gb)
Platform Analyzer
• Depth Buffer visualization
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System Analyzer HUD
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System Analyzer HUD
• Frames per second
• DirectX* version
• Resolution
• HUD mode
• 4 metrics graphs configurable from GPA Monitor
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Major performance information
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Configure HUD from the GPA Monitor
• Hot keys & GPU, CPU, DirectX metrics shown on HUD are fully configurable.
• Create multiple profiles and easy switch between them.
11
Settings
Profiles
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Capture “Interesting” Frames
• Select metric
• Decide the condition based on the selected metric
• Select type of capture: frame, trace, or both
• Choose what to do with the application after the capture
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Triggers
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HUD State Overrides
• Use state overrides to find high-level bottlenecks
• Example: Disable Draw Calls
– CPU or GPU bound
• Example: 1x1 Scissor Rect
– Helpful to determine if your game is pixel shader bound
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„What if?‟ experiments
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Darkspore and GPA Demo
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Darkspore (Marketing Pitch)
• Online Action RPG
• Play a Squad of 3 Heroes
• Spore Editor
• 100 Heroes to Unlock
• 4 player Co-op
• 2v2 PVP
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Improved Gaming Experience on Mainstream Graphics with SandyBridge
• 1280 x 720
• 30 FPS
• Medium settings
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Darkspore Rendering
Deferred Pass First Target
• Normal (RGB) + Gloss (A)
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Deferred Pass ( First Render Target )
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Darkspore Rendering
• Deferred Pass Second Target
• Depth (R*256+G) + SpecPow (B) + ToonId (A)
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Deferred Pass ( Second Render Target )
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Darkspore Rendering
• Lighting pass
• Diffuse (RGB) + Specular (A)
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Lighting Pass
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Darkspore Rendering
• Final Pass
• Color + Glow + Post FX + Particles + UI =
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Final Pass
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Darkspore Rendering (Final Frame)
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Darkspore and GPA
Analyzing performance without GPA
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Analyzing Darkspore with GPA
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Enable HUD
• Launch with full path
• Launch from recent applications list
• Enable with Auto-detect feature
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Analyzing Darkspore with GPA
Start
25
Capture the frame
• Capture an interesting frame with hotkey
(Ctlr+Shift+C by default)
• Launch Frame Analyzer and open captured frame
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Analyzing Darkspore with GPA
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Blood Decals in the Deferred and Final pass
• Tall bars are draw calls taking the most time
• Wide bars spend more time in the pixel shader
• In Darkspore we saw a lot of big bars…
Analyze the frame
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Analyzing Darkspore with GPA
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Look at the shader
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Analyzing Darkspore with GPA
GPA shows a 30%
and 24% improvement
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More shader optimizations
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Analyzing Darkspore with GPA
Finished?
29
The frame after shader simplification
Nope
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Analyzing Darkspore with GPA
Blood decals are volumes that write more pixels
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View Blood Decals in Wireframe Mode
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Analyzing Darkspore with GPA
Use the stencil to kill pixels in the final pass
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Optimization idea
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Analyzing Darkspore and GPA
32
Changing DX States within GPA
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Analyzing Darkspore with GPA
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Let‟s check the results
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Darkspore and GPA
Ok, finished!
34
Maybe...
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Other Optimizations for Darkspore
Trees all had roots below the ground!
35
Optimization 1: Remove roots under the ground
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Other Optimizations for Darkspore
Terrain mixes 4 textures together per pass, but large sections only really need one
36
Optimization 2: Optimize terrain rendering
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Other Optimizations for Darkspore
Creatures were really dense and burning quads
37
Optimization 3: Optimize character geometry
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Other Optimizations for Darkspore
View space normalstook only two channels but weren‟t worth the cost.
38
Optimization 4: Use world-space normals
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GPA 4.1 Platform Analyzer
40
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Working with leading middleware providers for complete compatibility
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42
Instrumenting Code for Platform Analyzer
#include <ittnotify.h>
void System::DoWork( … )
{
__itt_begin_task( “System::DoWork” );
// do work
__itt_end_task();
}
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44
• Tasks timeline displays instrumented code as it is executed over time
• CPU/GPU Frames and DirectX* calls displayed by default
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45
• Per-process CPU affinity graph, showing on which CPU cores the process was running
GPA 4.1New
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46
GPA 4.1
• CPU per-core context switches timeline, showing: GPA-instrumented processes for a traced application
GPA-non-instrumented processes for a traced application
Other processes
CPU idle time
New
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• Overview statistics for the current trace displayed
• Tabs display information for selectedtasks
• Relations, such as dependencies,between tasks shown in hierarchy
• CPU/GPU and DirectX* metrics displayedper selected frame
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Pre-instrumented components
• DirectX* interceptor used by Intel® GPA
• Threading Building Blocks
• Scaleform and Havok first two…many more middleware to come pre-instrumented
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One more time... Where to get Intel GPA?
49
www.intel.com/software/gpa
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With the chance to sell your game on STEAM*
![Page 52: Questions · •Sneak Peek of Darkspore •Live demo of GPA •Q & A. ... from GPA Monitor 10 Major performance information. Configure HUD from the GPA Monitor • Hot keys & GPU,](https://reader034.vdocuments.mx/reader034/viewer/2022050520/5fa381968155aa2c9c283ab3/html5/thumbnails/52.jpg)
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• Enter your game demo to compete for industry recognition, thousands in cash, and the chance to sell your game on STEAM*
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Questions?
54
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55
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Optimization NoticeOptimization Notice
Intel® compilers, associated libraries and associated development tools may include or utilize options that optimize for instruction sets that are available in both Intel® and non-Intel microprocessors (for example SIMD instruction sets), but do not optimize equally for non-Intel microprocessors. In addition, certain compiler options for Intel compilers, including some that are not specific to Intel micro-architecture, are reserved for Intel microprocessors. For a detailed description of Intel compiler options, including the instruction sets and specific microprocessors they implicate, please refer to the “Intel® Compiler User and Reference Guides” under “Compiler Options." Many library routines that are part of Intel® compiler products are morehighly optimized for Intel microprocessors than for other microprocessors. While the compilers and libraries in Intel® compiler products offer optimizations for both Intel and Intel-compatible microprocessors, depending on the options you select, your code and other factors, you likely will get extra performance on Intel microprocessors.
Intel® compilers, associated libraries and associated development tools may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include Intel®
Streaming SIMD Extensions 2 (Intel® SSE2), Intel® Streaming SIMD Extensions 3 (Intel® SSE3), and Supplemental Streaming SIMD Extensions 3 (Intel® SSSE3) instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors.
While Intel believes our compilers and libraries are excellent choices to assist in obtaining the best performance on Intel® and non-Intel microprocessors, Intel recommends that you evaluate other compilers and libraries to determine which best meet your requirements. We hope to win your business by striving to offer the best performance of any compiler or library; pleaselet us know if you find we do not.
Notice revision #20101101
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