字幕组成品列表（Beta）
  • 写在前面
  • Android 平台
    • Game On! 游戏开发系列 - 031
      • Pie Noon - 1503060393
      • The Death of Base Game Activity - 1504030543
      • Surviving OpenGL Context Loss - 1504030546
      • WebP for Game Devs - 1504030547
      • Saved Games In-Depth (Part 1) - 1504070556
      • Saved Games In-Depth (Part 2) - 1504030548
      • Smaller Flipbook Textures with CRABBY - 1504030544
      • Google Tag Manager - 1504030545
      • Flatbuffers - 1505050794
      • Achievement Point Pointers - 1505050796
      • Frequency Scaling - 1505050797
      • Meet the Management APIs - 1501140367
      • Y U Ship Broken Games - 1505050795
    • Android 性能优化 - 088
      • Garbage Collection in Android - 1503170425
      • Performance Cost of Memory Leaks - 1503170424
      • Rendering Performance 101 - 1501130351
      • Understanding Overdraw - 1501130352
      • Understanding VSYNC - 1501130353
      • Tool - Profile GPU Rendering - 1501130354
      • Why 60fps? - 1501130355
      • Android UI and the GPU - 1501130356
      • Invalidations, Layouts, and Performance - 1501130357
      • Overdraw, Cliprect, QuickReject - 1501130358
      • Tool - Memory Monitor - 1501130363
      • Battery Performance 101 - 1501130364
      • Understanding Battery Drain on Android - 1501130365
      • Battery Drain and WakeLocks - 1501130366
      • Memory Performance 101 - 1504170661
    • I/O 2014 Android 开发专题 - 089
      • Activity Transitions - 1504020505
      • Building Apps For Android TV - 1504020520
      • Building great Android media experiences - 1504020510
      • Building a quality app from start to finish - 1504020515
      • App Indexing API - 1504020507
      • What's new in WebView - 1504010484
      • Bluetooth Low Energy - 1504010486
      • Building impressive Android media experiences - 1504010493
      • The next Generation of Authentication - 1504020497
      • Don't Alpha That Pixel! - 1504020523
      • NFC + HCE Your phone in an interactive world - 1504020509
      • Demystifying encodes and decodes of WebM - 1504020521
      • Google Cloud Messaging - 1504020524
      • Getting your Game on the Big Screen - 1504020518
      • I hear you like realtime memes - 1504020511
      • Offerize your App - 1504020506
      • Using the Android Job Scheduler - 1504020504
      • From Holo to Material - 1504020526
      • Under the Hood of Android Auto - 1504020501
      • Isolation for Android App Developers - 1504020498
      • Android Work - 1504010496
      • ExoPlayer: Adaptive video streaming on Android - 1504010489
      • Sample rates and resampling: Why can't we all just agree? - 1504010488
      • Drive Android API - 1504010485
    • Android Studio - 004
      • Layout Editor (Ep 3, Android Studio) - 1503290479
      • Introducing Gradle (Ep 2, Android Studio) - 1503170426
    • I/O 2014 Android 分发主题 - 091
      • Introduction to Google Play - 1504030534
      • Google Play: building your user community - 1504030535
      • Optimizing Apps for Education - 1504030536
      • Succeeding in Education Technology - 1504030530
      • Subscriptions Made Easy with Google Play - 1504030531
      • The world is your playground - go global with Google - 1504030533
      • Maximizing discoverability on Google Play - 1504030538
    • Android Auto - 003
      • Introduction to Android Auto - 1504130615
      • Android Auto Messaging - 1504130617
      • Android Auto Audio - 1504130616
    • Android Wear - 006
      • Designing for Android Wear - 1503210448
      • How We Customized Google Apps for Android Wear - 1503210450
      • Fullscreen apps for Android Wear - 1503210445
      • New Notification Features for Android Wear - 1503210446
      • Building Cloud-powered wearable Apps - 1503210449
      • An Introduction to Android Wear - 1503190435
      • Google I/O 2014 - Android Wear: The developer's perspective - 1503210442
      • Devoxx 2014 Interviews: Android Wear - 1503210440
      • DevBytes: Watch Faces for Android Wear - 1503210439
    • Android TV - 005
      • Using the Leanback library - 1504080588
      • Beach Buggy Racing Multiplayer with Nearby Connections (Play Services) - 1503060387
    • Android for Work - 106
      • Android for Work for Developers - 1503060390
      • App Configurations, Testing and Launchers - 1504110590
    • IO Bytes 2014 - Android - 066
      • Chrome Apps on Android and iOS - 1501080014
      • Perf Primer CPU, GPU and your Android game - 1501080017
  • Chrome 平台
    • IO Bytes 2014 - Chrome and Web - 067
      • Using the PageSpeed API - 1505070815
      • Fabulous Forms for the multi-device web - 1505070816
      • Testing multi-screen web pages - 1505070817
      • Responsive images today - 1505070819
      • Web Performance Testing at YouTube - 1505070828
      • Building sites for the multi-device web - 1505070820
      • Deep dive: Google Cloud Messaging for Chrome - 1505070827
  • Google 创业者资源
    • Coffee with a Googler - 012
      • Chat with Allen Huang of AndroidTV - 1503040384
      • Chat with Fred Chung about developer advocacy - 1503070395
      • Google Fit platform with Michelle Haq - 1503210443
      • Android Auto Product Manager Andrew Brenner - 1501120027
      • Chat with Francis Ma about Google Play services - 1501120028
    • Root Access For Startups - 077
      • What we learned building plug-ins for Android, with startup Magnet - 1503230453
      • How to use crowdfunding to your advantage, with startup Hale Devices - 1503280462
      • How to overcome customer objections when selling tech, with startup Guesswork - 1503280458
    • First Things First - 029
      • Getting started with Android: A crash-course in developing for Android - 1504120601
      • How to ask a question: conducting research for your startup - 1504120603
      • MVP Design Hacks: transform your hot idea into a validated prototype - 1504120602
      • Build something people want: Solving real problems - 1504120605
    • How I - 061
      • Use BigQuery to find my most valuable customers - 1504070573
      • Manage beta testing communities using Google Play - 1504070572
      • Use paper wireframing to build native prototypes - 1504070570
      • Used social media and $0 marketing to get 68 million users - 1504070568
      • Prep to fundraise with four questions - 1504070564
      • Validated my idea in 2 days (with no code) - 1504070562
      • Build open platforms on Android - 1504120596
      • Get cheap, automatic analytics for my business using BigQuery - 1504070571
      • Write press releases to get international media coverage - 1504070569
      • Test beta-product features using Google Apps - 1504070563
      • Use URL builder to measure ROI on social media - 1504070561
      • Use events to build DeadSocial's brand - 1504070557
      • Use BigQuery to visualize streaming data - 1503220452
      • Find, screen, and hire developers - 1503120406
      • Drive engagement with social challenges - 1504070558
  • 设计
    • DesignBytes - 017
      • Paper and Ink: The Materials that Matter - 1505050793
  • 云计算
    • DevBytes: Google Cloud Platform - 021
      • Powering the next killer app with the Google Cloud Platform - 1504210672
      • Introduction to Google Cloud Endpoints - 1504210675
      • The Beauty of Scale with Google Cloud Platform - 1504210678
    • Google Cloud Platform - Big Data - 105
      • GDELT & BigQuery: Understand the world - 1502200379
    • Uncategorized - 999
      • Introducing Google Cloud Platform Resources - 1501190370
  • Google 应用开发
    • Launchpad Online - 072
      • The Setup: Creating new apps using Google APIs - 1503190428
      • Listing your files in Google Drive - 1503190429
      • Customizing Google Analytics for your startup - 1503290473
      • The Launchpad Online series - 1503190427
      • Getting started with Google Analytics - 1503290472
      • Accessing Google Maps from a spreadsheet?!? - 1502220381
      • Change the world in 10 lines of code - 1503080398
    • Google Play Services - 054
      • Google Play services 6.1 - 1503290481
      • Google Play Services 7.0 - 1503200437
      • Google Play Services 6.5 - 1501080015
    • 谷歌地图 iOS SDK - 053
      • Maps Live: New Features in the Google Maps Mobile APIs for Android and iOS - 1504300777
    • Google 移动搜索开发 - 055
      • Is your app in the Google index? - 1504120598
      • Get more engaged users with Google Search for Developers - 1503070397
    • DevBytes: Google Cast - 020
      • Google Cast SDK for Android - 1504180666
      • Media Router Framework - Part 1 - Media Router API - 1504180667
      • Overview for Google Cast Receivers - 1504180664
      • Google Cast SDK for iOS - 1504180663
    • Getting Started with the Google Maps SDK for iOS - 035
      • Getting started with the Google Maps SDK for iOS, Part 1 - 1504270757
    • IO Bytes 2014 - Wearables - 070
      • Voice Driven GDK Glassware - 1505280836
    • Route 85 - 078
      • Introducing Route 85 - 1501120022
      • Quick Tip: Don't Default that Switch! - 1501190371
      • OpenInChrome on iOS, Part 1 - 1501120023
      • OpenInChrome on iOS, Part 2 - 1501120024
      • OpenInChrome on iOS, Part 3 - 1501120025
      • OpenInChrome on iOS, Part 4 - 1501120026
    • DevBytes 2014 - 019
      • Web Components - Template - 1505040789
      • Wearable DataLayer API - 1505050792
      • Using srcset for responsive images - 1505050790
      • The picture element for art direction - 1505050791
    • Uncategorized - 999
      • Sun Surveyor brings augmented reality to photographers using Google Maps APIs - 1504200668
      • Snappy travels with the Roads API - 1503060392
      • Easy Maps Apps in Java and Python - 1501140030
  • Google 广告平台
  • Polymer
    • Polycasts - 076
      • The Awesome Power of Auto-Binding Templates -- Polycasts #08 - 1502220382
      • Content Switcheroo with Core-Pages -- Polycasts #09 - 1502200380
      • Core Iconset -- Polycasts #02 - 1505040788
  • Web 平台
    • HTTP 203 - 062
      • Gotchas - 1501140368
      • Font Rendering - 1501080016
    • Web Components - 081
      • DevBytes: Web Components - Overview - 1504250709
  • 宣传视频
    • Uncategorized - 999
      • Google Developers - 1501150369
      • I/O Extended 2014 - Join me - 1502220383
  • Google 各类开发者会议
    • 2014 Chrome 开发者高峰会议 - 009
      • Keynote - Chrome Dev Summit 2014 (Darin Fisher) - 1503120407
      • TLS All the Things! - Security with Performance(Chris Palmer) - 1503140412
      • Let’s build some apps with Polymer!(Rob Dodson) - 1503150415
      • Day One Closing Remarks(Sundar Pichai) - 1503150417
      • Chrome Leadership panel - 1503160422
      • Fundamentals of Mobile Web Development(Matt Gaunt) - 1503150416
    • 2015 游戏开发者大会中 - 039
      • FlatBuffers - 1504150640
      • Games for Google Cast - 1504150637
      • Top 10 Things Android Game Developers Should Know v 3.0 - 1504150643
      • Automate Publishing for Google Play APIs - 1504150639
      • 3 Game Design Mistakes You're Making - 1504150636
      • Android TV - 1504150638
      • How to Go Viral Without Really Trying - 1504150641
    • Devoxx 2014 Interviews - 024
      • What's new in Android 5.0 Lollipop - 1504260740
      • Android Tools - 1504260743
      • BigQuery and user-defined functions - 1504260744
    • IO Bytes 2014 - 065
      • Dart in Google Cloud - 1505070810
      • Big genomic data on Google Cloud Platform - 1505070811
      • Easy International Checkout with Chrome - 1505070802
      • Google developer tools and APIs for iOS - 1503190436
      • Whet your appetite with IO Bytes - 1501080021
    • PlayTime@Shanghai - 095
      • 主题演讲 Chris Yerga - 1504060549
      • 如何成功地开发你的应用 Ellie Powers - 1504060550
      • 在Google上营利 Brahim Elbouchikhi - 1504060551
      • Playtime Shanghai event sizzle reel - 1504070552
    • Project Google I/O 2015 - 098
      • Project Tango Mobile 3D tracking and perception - 1506120857
      • Democratizing Education - 1506120868
      • Improve your Android app’s accessibility - 1506120864
      • Google Cloud Messaging 3.0 - 1506120844
      • Developers connecting the world through Google Play - 1506120862
  • 开源开放技术
    • Compressor Head - 013
      • The Trailer, Season 2 - 1503060385
      • Behind the Scenes - 1503210441
      • Arithmetic Compression (Ep 5, Compressor Head) Google - 1503070394
      • Introducing Compressor Head - 1502120372
      • Episode 1 (Variable Length Codes) - 1502120373
      • Episode 2 (The LZ77 Compression Family) - 1502120374
      • Episode 3 (Markov Chain Compression) - 1502120375
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  1. Android 平台
  2. IO Bytes 2014 - Android - 066

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视频发布时间

2014年6月12日

视频介绍

Quickly finding your games' performance bottleneck is critical to address development issues before they become a problem. In this talk, we'll cover 4 simple steps to follow in order to determine what part of your CPU / GPU pipeline that your game is currently choking on. Find the problem, fix it quick, and be on your way.

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1501080017

解说词中文版：

让我们来举个例子 你得到了某些非常棒的

有着几十万下载量的Android游戏

但是看起来你不能打破这种已经有百万用户做过的标记

理由是

用户们对你的游戏的性能非常的不满意

你看 用户注意到了在你的游戏中其他的部分

比如说项目状态或者是UI界面或者是

任何的其他的功能都没有非常糟糕的性能更加突出

或者换句话说 你的字符之一在三级层面上

事实上是在说克林贡语

然后你猜怎么了

用户对于游戏性能非常糟糕的问题给出了中差评的比例

高于你的游戏出现的其他的问题而导致的中差评

你真的想要拥有百万以上的用户量

所以你一定要解决你的游戏的性能问题

对于现代的Android游戏而言

你应该开始理解它们有一种紧密的联系

例如探戈舞 如果在你的游戏中

CPU和GPU可以相互协作

则会对性能产生极大的影响

这种原理与CPU和GPU协作是有相似之处的

现代的图形API不允许

CPU直接和GPU硬件建立连接

相反的 它有一个中间的过程

是我们所熟知的图形驱动程序

来处理CPU与GPU之间的通信

从CPU中取出的请求会被缓存在

硬件驱动中作为一个消息队列

当GPU硬件已经准备好接收任务的时候

它会从相同的资源开始执行命令

并在GPU上面开始执行它

在驱动程序的消息队列中存在

意味着CPU可以以不同的速度

推送信息到驱动

GPU在从队列中读取消息

与此同时 你的GPU可以假设处理

并且在CPU之后绘制

大约1到2帧的数据

现在 即使报警 也不需要担心

这其实是典型的现代的硬件体系架构

但是要记住这一点

了解你的游戏一旦达到了60帧的帧率

那么就要求你的CPU和GPU的帧数

都在16毫秒内完成了它们所有的工作

当这两个系统中开始同步的时候

需要更长的时间

你的帧速率将变得更加糟糕

举个例子 如果你的GPU

比CPU做了更多的工作呢

这说明你的CPU提交的已经处理过的帧数

到驱动中以一个比GPU更快的频率工作

实际上是GPU将浪费掉更多的资源

最终 驱动队列会被填满

之后在任意一段时间内

CPU想要去发送一个硬件调用指令

它就会停下来 等待GPU的相应

并且去按照顺序清理掉一些指令

释放一些空间去保证CPU可以

继续的向硬件驱动队列发送它的新指令

另一方面 如果你的CPU被绑定了

然后你向GPU的工作线路中插入新的任务

每次CPU发送一帧的数据

GPU会立刻使用它并进行处理

然后等待下一帧的数据

它就可以继续工作了

要解决这个问题的最直接的办法就是

让CPU做更少的工作

但是在这种情况下 可能会出现

GPU没有足够多的工作去做并且正确的动作是

实际上是有序的给它更多的工作

以最大限度的发挥GPU的数据吞吐量

对于设计者来说这是一个很好的机会

在屏幕上放置200多个僵尸

你可以估计你的问题所在

去认真的研究一下CPU在几秒钟的模拟时间里的

帧数数据

举个例子 如果你的CPU帧数处理时间

大约在16毫秒

那么你的游戏会运行的非常棒

现在 你的目标是去保持帧数数据

的处理时间在16毫秒以下 某些帧数

随CPU加载而变化 你还希望时间有一些小差异

然而 如果你的帧数突然开始飙升

你的CPU数据运算结果还没有加载完成

那么你将不能在屏幕上放置200个僵尸

有很大的可能是由于GPU

做了备份 强迫CPU在驱动程序中

去拖延时间

这些高峰实际上是说大概在11-15毫秒的时间

GPU到底需要多长的

时间去进行冲洗帧操作

为了发现真正的罪魁祸首是什么

是时候坐下来然后

熟练掌握移动数据分析工具了

一些GPU性能的细微差距

需要特殊的工具去发现它

值得庆幸的是 每一个Android芯片制造商

都提供了一套非常强大的工具包

给了你更多的信息并告诉你们

如何针对他们的硬件去优化你的游戏

理解和调整CPU和GPU之间的协作的第一步

是最大化你的游戏的性能

当然 这样的结果会使用户们更加高兴

游戏则会有更好的购买量

这才是最重要的 不是吗

所以 静下来 像往常一样去测试你的代码

一定要记住性能是非常重要的

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