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有趣的阅读 - 如何量化分析Unity着色器的性能开销

 3 years ago
source link: https://zhuanlan.zhihu.com/p/161761815
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有趣的阅读 - 如何量化分析Unity着色器的性能开销

计算机图形学话题下的优秀回答者

本文是一篇很有趣的文章，通过对Shader性能进行量化来分析Unity Shader的复杂度。

为此，作者将使用mali offline shader compiler这个比较冷门的工具来查看Unity中不同Shader的GPU cycles开销。

通常来查看一个Shader的开销有两种套路：

第一种就不赘述了，属于玄学。第二种还可以细分为对Shader进行静态分析或是在运行时profile各种性能指标。而本文作者使用的Mali Offline Compiler听上去就是用于前者的，即对shader代码进行静态分析。而Mali Offline Compiler的分析报告就会包含所消耗的GPU cycles，并且指出性能的bound是哪类操作。下面是一个示例。

`C:\Users\rtorresb\Desktop\Tmp>malioc shader.vert
Mali Offline Compiler v7.1.0 (Build 7a3538)
Copyright 2007-2020 Arm Limited, all rights reserved
Configuration
=============
Hardware: Mali-G76 r0p0
Driver: Bifrost r19p0-00rel0
Shader type: OpenGL ES Vertex (inferred)
Main shader
===========
Work registers: 32
Uniform registers: 82
Stack spilling: False
A LS V T Bound
Total instruction cycles: 2.9 16.0 0.0 0.0 LS
Shortest path cycles: 2.9 16.0 0.0 0.0 LS
Longest path cycles: 2.9 16.0 0.0 0.0 LS
A = Arithmetic, LS = Load/Store, V = Varying, T = Texture

比如这个Shader的LS = Load/Store是一个可以考虑优化的着手点。

全文分为以下几个部分：

  • Is It Important to Count GPU Cycles Nowadays?
  • Setting Up Your Mali Offline Compiler
  • Compiling Your Unity Shaders
  • Getting Your Unity Shader Performance Metrics
  • What Does This Teach Us?

原文标题：

How to Analyze the Performance Cost of Your Unity Shaders？

文章链接:

How to Analyze the Performance Cost of Your Unity Shaders - The Gamedev Guru​thegamedev.guru图标
编辑于 07-20

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