Using Intel Hardware Metrics to Make Your Unity Game Faster, Faster Cristiano Ferreira - Intel

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Agenda • • • •

What are hardware metrics? Why use hardware metrics? Important metrics overview Optimizations scenarios

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What are hardware metrics? • Values attained directly from hardware counters • Easily detect: • Resources oversubscribed • Potential bottlenecks • Where compute time is being spent

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Why Use Hardware Metrics? • Hardware counters don’t lie • Cut out a lot of potential guess work and thought experiments • Make a baseline performance target for each ‘Quality Setting’ in Unity specific to your lowest supported device, or even for all low, mid, high, enthusiast tiers. • Optimize for lowest end hardware

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Why Use Hardware Metrics?

Unity hardware metrics - http://hwstats.unity3d.com/index.html 7

Why Use Hardware Metrics?

Unity hardware metrics - http://hwstats.unity3d.com/index.html 8

Graphics Performance Analyzer Tools • System Analyzer • Frame Analyzer • Platform Analyzer

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Intel® GPA – Workflow System Analyzer: Run with Intel® GPA

Frame Analyzer:

Capture frame

GPU Limited CPU Limited

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Platform Analyzer:

Capture trace

In-App Analysis

Offline Analysis 10

System Analyzer – Details – Real Time Metrics • • • • • •

CPU Metrics GPU Metrics Memory Metrics Power Metrics Graphics API Metrics Other Platform Metrics *Metric availability depends on platform

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Frame Analyzer

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Typical Analysis Steps 1. Find biggest opportunities for optimization (long GPU duration) 2. Find out the most stressed parts of the pipeline in those calls 3. Find the corresponding material / settings in Unity to discover how to alleviate the issue

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General Metric Types • Execution Unit (EU) Active • Execution Unit (EU) Idle • Execution Unit (EU) Stall

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General Metric Types: EU Active • The piece of the pipeline is active and has work • Usually a good thing, but this will not tell you if all calculations are necessary or as optimized as they should be • Objective is to keep each piece of the pipeline as active as possible without doing unnecessary work

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General Metric Types: EU Idle • The piece of the pipeline doesn’t have any work to do

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General Metric Types: EU Stall • An EU becomes stalled when all of its threads are waiting for results from fixed function units • Ex. Pixel shader requests texels from the texture sampler

• Objective is to reduce stall percentage as much as possible

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Other interesting metrics • Sampler is Bottleneck % • Samplers Busy % • GTI Read Throughput, bytes • GTI Write Throughput, bytes

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Vertex Shader • Used for vertex transformations and per-vertex calculations for effects • If duration of VS is highest in the pipeline, can save time by: • Simplifying geometry (LOD!) • Simplifying per-vertex compute

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Vertex Shader

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Fragment Shader • After your model is projected into 2D space and rasterized, a fragment shader is executed for every pixel that is touched by the input geometry • Main goal typically to calculate the final pixel color • Can also be used for full screen image effects

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Fragment Shader

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Find Your Fragment Shader in Unity

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DEMO!

Typical Analysis Steps 1. Find biggest opportunities for optimization (long GPU duration) 2. Find out the most stressed parts of the pipeline in those calls 3. Find the corresponding material / settings in Unity to discover how to alleviate the issue

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Demo: Render Queue Ordering

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Demo: Render Queue Ordering

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Demo: Render Queue Ordering

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Demo: Render Queue Ordering

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Demo: Uncompressed Texture Viewing

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Demo: Uncompressed Texture Viewing

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Demo: Uncompressed Texture Viewing

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Demo: Uncompressed Texture Viewing

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Demo: Uncompressed Texture Viewing Uncompressed Texture

Compressed Texture

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Demo: Fully / Semi Transparency

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Demo: Disable Fully Transparent Objects

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Demo: Disable Fully Transparent Objects

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Demo: Forward Passes for Per-Pixel Lights

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Demo: Forward Passes for Per-Pixel Lights

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Demo: Forward Passes for Per-Pixel Lights

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Demo: Forward Passes for Per-Pixel Lights

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Demo

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Conclusion • Get the free tools! • https://software.intel.com/en-us/gpa

• Check out accompanying Unity optimization guide • http://intel.ly/1psrRKI

• Download today’s workload to follow along • https://github.com/GameTechDev/UnityPerformanceSandbox

• Tweet me! • Cristiano - @Cristianohh 43