Make your unity game faster, faster

Cristiano Ferreira – IntelMark Harkness - Unity

Using Intel Hardware Metrics to Make Your Unity Game Faster, Faster

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About Cristiano

About Mark

• Been at Unity for almost 6 years

• Worked in the Developer Relation for almost that whole time

• Currently touring north America helping Unity teams to optimize their projects

Agenda

• What are hardware metrics?

• Why use hardware metrics?

• Important metrics overview

• Sweet demos

claimed as the property of others. 6

What are hardware metrics?

• Values attained directly from hardware counters

• Easily detect:

• Resources oversubscribed

• Potential bottlenecks

• Where compute time is being spent

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

• Integrated graphics are great at what they do, but don’t consume/use the power of the massive dedicated discrete cards in typical gaming rigs

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

Graphics Performance Analyzer Tools

• System Analyzer

• Frame Analyzer

• Platform Analyzer

Intel® GPA – Workflow

System Analyzer:

Frame Analyzer:

Platform Analyzer: CPU Limited

GPU Limited

Capture frame

Capture trace

?Run with Intel® GPA

In-App Analysis Offline Analysis

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

Frame Analyzer

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

General Metric Types

• Execution Unit (EU) Active

• Execution Unit (EU) Idle

• Execution Unit (EU) Stall

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

General Metric Types: EU Idle

• The piece of the pipeline doesn’t have any work to do

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

Typical Stressed Areas

1. Pixel Shader

2. Sampler

3. Memory Bandwidth

4. Vertex Shader

Other interesting metrics

• Sampler is Bottleneck %

• Samplers Busy %

• GTI Read Throughput, bytes

• GTI Write Throughput, bytes

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

Vertex Shader

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

Fragment Shader

Find Your Fragment Shader in Unity

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

Metrics In Unity Editor

Conclusion

• Get the free tools!

• https://software.intel.com/en-us/gpa

• Check out accompanying Unity optimization guide

• https://software.intel.com/en-us/android/articles/unity-optimization-guide-for-x86-android-part-1

• Download today’s workload to follow along

• https://github.com/GameTechDev/UnityPerformanceSandbox

• Contact!

• Twitter @Cristiano – Cristiano.Ferreira@intel.com

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