Android UI性能測試——使用 Gfxinfo 衡量性能
Android官方文檔翻譯html
原文地址：https://developer.android.com/training/testing/performance
參考：https://www.jianshu.com/p/7477e381a7eajava
用戶界面（UI）性能測試不只能夠確保app知足其功能要求，並且可以保證用戶與app之間的交互是至關平滑的——以每秒60幀的速度運行（爲何是60fps？），沒有任何丟棄或延遲的幀（或者咱們喜歡稱之爲jank）。本文檔介紹了可用於衡量UI性能的工具，並提供了將UI性能測量集成到測試實踐中的方法。android
爲了提升性能，咱們首先須要可以衡量系統的性能，而後診斷並識別可能從管道的各個部分到達的問題。shell
dumpsys是一款運行在設備上的Android工具，能夠輸出有關係統服務狀態的信息。將 gfxinfo命令傳遞給dumpsys可在logcat中提供輸出，其中記錄了各階段期間發生的動畫以及幀相關的性能信息。緩存
adb shell dumpsys gfxinfo < PACKAGE_NAME >
該命令能夠輸出多種不一樣的幀耗時信息。運行該命令後，可到以下結果app
C:\Users\Administrator>adb shell dumpsys gfxinfo com.zhihu.android Applications Graphics Acceleration Info: Uptime: 2104762906 Realtime: 3192448754 ** Graphics info for pid 23231 [com.zhihu.android] ** Stats since: 2104750516354290ns Total frames rendered: 360 Janky frames: 35 (9.72%) 50th percentile: 9ms 90th percentile: 16ms 95th percentile: 26ms 99th percentile: 117ms Number Missed Vsync: 14 Number High input latency: 0 Number Slow UI thread: 20 Number Slow bitmap uploads: 1 Number Slow issue draw commands: 16 HISTOGRAM: 5ms=16 6ms=13 7ms=31 8ms=108 9ms=53 10ms=36 11ms=27 12ms=18 13ms=9 14 ms=5 15ms=5 16ms=5 17ms=5 18ms=0 19ms=2 20ms=2 21ms=1 22ms=1 23ms=0 24ms=1 25ms= 4 26ms=1 27ms=0 28ms=2 29ms=0 30ms=0 31ms=2 32ms=0 34ms=0 36ms=0 38ms=1 40ms=0 4 2ms=1 44ms=0 46ms=0 48ms=1 53ms=0 57ms=1 61ms=0 65ms=0 69ms=1 73ms=0 77ms=0 81ms =0 85ms=1 89ms=0 93ms=0 97ms=1 101ms=1 105ms=0 109ms=0 113ms=1 117ms=1 121ms=0 1 25ms=0 129ms=0 133ms=0 150ms=0 200ms=1 250ms=0 300ms=0 350ms=1 400ms=1 450ms=0 5 00ms=0 550ms=0 600ms=0 650ms=0 700ms=0 750ms=0 800ms=0 850ms=0 900ms=0 950ms=0 1 000ms=0 1050ms=0 1100ms=0 1150ms=0 1200ms=0 1250ms=0 1300ms=0 1350ms=0 1400ms=0 1450ms=0 1500ms=0 1550ms=0 1600ms=0 1650ms=0 1700ms=0 1750ms=0 1800ms=0 1850ms=0 1900ms=0 1950ms=0 2000ms=0 2050ms=0 2100ms=0 2150ms=0 2200ms=0 2250ms=0 2300ms= 0 2350ms=0 2400ms=0 2450ms=0 2500ms=0 2550ms=0 2600ms=0 2650ms=0 2700ms=0 2750ms =0 2800ms=0 2850ms=0 2900ms=0 2950ms=0 3000ms=0 3050ms=0 3100ms=0 3150ms=0 3200m s=0 3250ms=0 3300ms=0 3350ms=0 3400ms=0 3450ms=0 3500ms=0 3550ms=0 3600ms=0 3650 ms=0 3700ms=0 3750ms=0 3800ms=0 3850ms=0 3900ms=0 3950ms=0 4000ms=0 4050ms=0 410 0ms=0 4150ms=0 4200ms=0 4250ms=0 4300ms=0 4350ms=0 4400ms=0 4450ms=0 4500ms=0 45 50ms=0 4600ms=0 4650ms=0 4700ms=0 4750ms=0 4800ms=0 4850ms=0 4900ms=0 4950ms=0 Caches: Current memory usage / total memory usage (bytes): TextureCache 4525536 / 75497472 Layers total 0 (numLayers = 0) RenderBufferCache 0 / 8388608 GradientCache 0 / 1048576 PathCache 1232324 / 33554432 TessellationCache 7416 / 1048576 TextDropShadowCache 4368 / 6291456 PatchCache 0 / 0 FontRenderer A8 567771 / 1048576 A8 texture 0 567771 / 1048576 FontRenderer RGBA 0 / 0 FontRenderer total 567771 / 1048576 Other: FboCache 0 / 2 Total memory usage: 6818220 bytes, 6.50 MB Pipeline=FrameBuilder Profile data in ms: com.zhihu.android/com.zhihu.android.app.ui.activity.MainActivity/android .view.ViewRootImpl@42bf37 (visibility=0) View hierarchy: com.zhihu.android/com.zhihu.android.app.ui.activity.MainActivity/android.view. ViewRootImpl@42bf37 251 views, 247.25 kB of display lists Total ViewRootImpl: 1 Total Views: 251 Total DisplayList: 247.25 kB
一 聚合幀統計信息ide
使用Android 6.0（API級別23），該命令將打印幀的聚合分析數據到logcat，並在整個過程生命週期內收集。下面介紹一些關鍵輸出信息：工具
- Graphics info for pid 23231 [com.zhihu.android] - 代表當前dump的爲知乎應用界面的幀信息，pid爲23231
- Total frames rendered: 360 - 本次dump蒐集了360幀的信息
- Janky frames: 35 (9.72%) - 360幀中有35幀的耗時超過了16ms，卡頓機率爲9.72%
- 50th percentile: 9ms
- 90th percentile: 16ms
- 95th percentile: 26ms
- 99th percentile: 117ms
- Number Missed Vsync: 14 - 垂直同步失敗的幀
- Number High input latency: 0 - 處理input時間超時的幀數
- Number Slow UI thread: 20 - 因UI線程上的工做致使超時的幀數
- Number Slow bitmap uploads: 1 - 因bitmap的加載耗時的幀數
- Number Slow issue draw commands: 16 - 因繪製致使耗時的幀數
- HISTOGRAM: 5ms=16 6ms=13 ... - 直方圖數據，表面耗時爲0-5ms的幀數爲16，耗時爲5-6ms的幀數爲13，同理類推。
這些高級統計數據在很高的層次上向咱們傳達了app的渲染性能，以及它在許多幀中的穩定性。佈局
二 精確幀耗時信息性能
Android 6.0版本爲gfxinfo提供了一個新的命令——framestats，其做用是能夠從最近的幀中獲取很是詳細的幀耗時信息，所以咱們能夠更準確地跟蹤和調試問題。
adb shell dumpsys gfxinfo < PACKAGE_NAME > framestats
此命令會打印出來app最後生成的120幀的幀耗時信息（使用納秒時間戳）。運行該命令後，可到以下結果
C:\Users\Administrator>adb shell dumpsys gfxinfo com.zhihu.android framestats > E:\log\zhihu.csv
Applications Graphics Acceleration Info: Uptime: 2129707269 Realtime: 3240872231 ** Graphics info for pid 15112 [com.zhihu.android] ** Stats since: 2129424813068755ns Total frames rendered: 1548 Janky frames: 553 (35.72%) 50th percentile: 14ms 90th percentile: 28ms 95th percentile: 32ms 99th percentile: 61ms Number Missed Vsync: 25 Number High input latency: 5 Number Slow UI thread: 468 Number Slow bitmap uploads: 6 Number Slow issue draw commands: 150 HISTOGRAM: 5ms=40 6ms=31 7ms=49 8ms=51 9ms=71 10ms=89 11ms=81 12ms=107 13ms=116 14ms=164 15ms=125 16ms=100 17ms=67 18ms=49 19ms=33 20ms=27 21ms=27 22ms=25 23ms=33 24ms=25 25ms=29 26ms=30 27ms=24 28ms=22 29ms=20 30ms=12 31ms=14 32ms=14 34ms=12 36ms=10 38ms=8 40ms=10 42ms=1 44ms=3 46ms=5 48ms=4 53ms=3 57ms=1 61ms=1 65ms=3 69ms=1 73ms=1 77ms=0 81ms=2 85ms=0 89ms=0 93ms=0 97ms=2 101ms=0 105ms=0 109ms=0 113ms=0 117ms=0 121ms=0 125ms=0 129ms=0 133ms=0 150ms=3 200ms=1 250ms=0 300ms=1 350ms=1 400ms=0 450ms=0 500ms=0 550ms=0 600ms=0 650ms=0 700ms=0 750ms=0 800ms=0 850ms=0 900ms=0 950ms=0 1000ms=0 1050ms=0 1100ms=0 1150ms=0 1200ms=0 1250ms=0 1300ms=0 1350ms=0 1400ms=0 1450ms=0 1500ms=0 1550ms=0 1600ms=0 1650ms=0 1700ms=0 1750ms=0 1800ms=0 1850ms=0 1900ms=0 1950ms=0 2000ms=0 2050ms=0 2100ms=0 2150ms=0 2200ms=0 2250ms=0 2300ms=0 2350ms=0 2400ms=0 2450ms=0 2500ms=0 2550ms=0 2600ms=0 2650ms=0 2700ms=0 2750ms=0 2800ms=0 2850ms=0 2900ms=0 2950ms=0 3000ms=0 3050ms=0 3100ms=0 3150ms=0 3200ms=0 3250ms=0 3300ms=0 3350ms=0 3400ms=0 3450ms=0 3500ms=0 3550ms=0 3600ms=0 3650ms=0 3700ms=0 3750ms=0 3800ms=0 3850ms=0 3900ms=0 3950ms=0 4000ms=0 4050ms=0 4100ms=0 4150ms=0 4200ms=0 4250ms=0 4300ms=0 4350ms=0 4400ms=0 4450ms=0 4500ms=0 4550ms=0 4600ms=0 4650ms=0 4700ms=0 4750ms=0 4800ms=0 4850ms=0 4900ms=0 4950ms=0 Caches: Current memory usage / total memory usage (bytes): TextureCache 48398952 / 75497472 Layers total 0 (numLayers = 0) RenderBufferCache 0 / 8388608 GradientCache 0 / 1048576 PathCache 2154760 / 33554432 TessellationCache 13032 / 1048576 TextDropShadowCache 55536 / 6291456 PatchCache 0 / 0 FontRenderer A8 3602340 / 5242880 A8 texture 0 994239 / 1048576 A8 texture 1 1044999 / 1048576 A8 texture 2 1042955 / 1048576 A8 texture 3 520147 / 2097152 FontRenderer RGBA 0 / 0 FontRenderer total 3602340 / 5242880 Other: FboCache 0 / 2 Total memory usage: 55865160 bytes, 53.28 MB Pipeline=FrameBuilder Profile data in ms: com.zhihu.android/com.zhihu.android.app.ui.activity.MainActivity/android.view.ViewRootImpl@10b457e (visibility=8) Window: com.zhihu.android/com.zhihu.android.app.ui.activity.MainActivity Stats since: 2129424813129171ns Total frames rendered: 524 Janky frames: 100 (19.08%) 50th percentile: 10ms 90th percentile: 23ms 95th percentile: 28ms 99th percentile: 150ms Number Missed Vsync: 14 Number High input latency: 0 Number Slow UI thread: 62 Number Slow bitmap uploads: 6 Number Slow issue draw commands: 32 HISTOGRAM: 5ms=40 6ms=31 7ms=48 8ms=45 9ms=50 10ms=59 11ms=47 12ms=38 13ms=22 14ms=21 15ms=15 16ms=15 17ms=13 18ms=7 19ms=4 20ms=1 21ms=5 22ms=9 23ms=5 24ms=4 25ms=9 26ms=3 27ms=5 28ms=2 29ms=3 30ms=2 31ms=4 32ms=1 34ms=0 36ms=1 38ms=1 40ms=3 42ms=0 44ms=0 46ms=0 48ms=1 53ms=1 57ms=0 61ms=0 65ms=0 69ms=0 73ms=1 77ms=0 81ms=0 85ms=0 89ms=0 93ms=0 97ms=2 101ms=0 105ms=0 109ms=0 113ms=0 117ms=0 121ms=0 125ms=0 129ms=0 133ms=0 150ms=3 200ms=1 250ms=0 300ms=1 350ms=1 400ms=0 450ms=0 500ms=0 550ms=0 600ms=0 650ms=0 700ms=0 750ms=0 800ms=0 850ms=0 900ms=0 950ms=0 1000ms=0 1050ms=0 1100ms=0 1150ms=0 1200ms=0 1250ms=0 1300ms=0 1350ms=0 1400ms=0 1450ms=0 1500ms=0 1550ms=0 1600ms=0 1650ms=0 1700ms=0 1750ms=0 1800ms=0 1850ms=0 1900ms=0 1950ms=0 2000ms=0 2050ms=0 2100ms=0 2150ms=0 2200ms=0 2250ms=0 2300ms=0 2350ms=0 2400ms=0 2450ms=0 2500ms=0 2550ms=0 2600ms=0 2650ms=0 2700ms=0 2750ms=0 2800ms=0 2850ms=0 2900ms=0 2950ms=0 3000ms=0 3050ms=0 3100ms=0 3150ms=0 3200ms=0 3250ms=0 3300ms=0 3350ms=0 3400ms=0 3450ms=0 3500ms=0 3550ms=0 3600ms=0 3650ms=0 3700ms=0 3750ms=0 3800ms=0 3850ms=0 3900ms=0 3950ms=0 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0,2129472193245412,2129472193245412,9223372036854775807,0,2129472194233851,2129472194304685,2129472196128643,2129472196408331,2129472199985414,2129472200195831,2129472200771872,2129472207299997,2129472209976039,501000,883000, 0,2129472209780228,2129472209780228,9223372036854775807,0,2129472210796351,2129472210860935,2129472212991664,2129472213290101,2129472215696872,2129472215868747,2129472216824476,2129472223586976,2129472226239060,405000,851000, ---PROFILEDATA--- View hierarchy: com.zhihu.android/com.zhihu.android.app.ui.activity.MainActivity/android.view.ViewRootImpl@10b457e 248 views, 195.69 kB of display lists com.zhihu.android/com.zhihu.android.app.ui.activity.QAHostActivity/android.view.ViewRootImpl@e6d2adf 152 views, 147.95 kB of display lists Total ViewRootImpl: 2 Total Views: 400 Total DisplayList: 343.63 kB
如下是該命令的一些關鍵輸出信息
Flags,IntendedVsync,Vsync,OldestInputEvent,NewestInputEvent,HandleInputStart,AnimationStart,PerformTraversalsStart,DrawStart,SyncQueued,SyncStart,IssueDrawCommandsStart,SwapBuffers,FrameCompleted,DequeueBufferDuration,QueueBufferDuration, 0,2129433806752476,2129433806752476,9223372036854775807,0,2129433807321878,2129433807343232,2129433807670316,2129433807767712,2129433808129691,2129433808170316,2129433808370316,2129433814887503,2129433816121878,3545000,402000, 0,2129433823287480,2129433823287480,9223372036854775807,0,2129433823732816,2129433823755212,2129433824101045,2129433824213024,2129433824851566,2129433824914066,2129433826678649,2129433834844795,2129433836318232,2036000,482000, 0,2129433839822411,2129433839822411,9223372036854775807,0,2129433840271878,2129433840293232,2129433845248961,2129433845402607,2129433846842191,2129433846912503,2129433847186982,2129433851378649,2129433853024482,394000,494000,
此輸出的每一行表明app生成的一幀。每一行的列數都相同（16列），描述在生成幀的管道的每一個階段所花費的時間。下一節將詳細介紹此格式，包括每列所表明的內容。
Framestats數據格式
因爲數據塊以CSV格式輸出，所以將其粘貼到咱們選擇的電子表格工具，或者使用腳本進行收集和解析很是簡單。下面說明了輸出數據列的格式。全部時間戳都以納秒爲單位（1納秒=1e-6毫秒）。
1.FLAGS
若是flags爲0，則此幀的總耗時時間 = FRAME_COMPLETED（第14列，幀的結束時間） - INTENDED_VSYNC（第2列，幀的預期開始時間）。
若是flags不爲0，則忽略該行，由於該幀的佈局和繪製時間超過16ms，爲異常幀。如下是可能發生的一些緣由：
（1）窗口布局發生變化（例如app的第一幀或旋轉後）；
（2）幀被跳過也是有可能的，在這種狀況下，某些值將具備垃圾時間戳。例如，若是幀超出60fps，或者屏幕上沒有任何內容變髒，則可能跳過一個幀，這不必定是app中出現問題的跡象。
2.INTENDED_VSYNC
幀的預期開始時間。若是此值與VSYNC不一樣，則UI線程上發生了阻止其及時響應vsync信號的工做。
3.VSYNC
花費在vsync監聽器和幀繪製的時間（Choreographer frame回調，動畫，View.getDrawingTime()等）。
要了解VSYNC的更多信息及其對app的影響，請查看Understanding VSYNC 視頻。
4.OLDEST_INPUT_EVENT
輸入隊列中最先輸入事件的時間戳。若是此幀沒有輸入事件，則爲Long.MAX_VALUE。
此值主要用於平臺工做，對app開發人員的用處不大。
5.NEWEST_INPUT_EVENT
輸入隊列中最後輸入事件的時間戳，若是此幀沒有輸入事件，則爲0。
此值主要用於平臺工做，對app開發人員的用處不大。
可是，經過計算FRAME_COMPLETED - NEWEST_INPUT_EVENT的值，能夠大體瞭解app添加的延遲時間。
6.HANDLE_INPUT_START
將輸入事件分派給app的時間戳。
經過計算ANIMATION_START - HANDLE_INPUT_START的值，能夠測量app處理輸入事件所花費的時間。
若是它們的時間差很高（> 2ms），則表示app花費了很是長的時間處理輸入事件，例如View.onTouchEvent()，這可能表示此工做須要優化，或者分發到其餘線程。可是請注意，在某些狀況下，例如發起新活動或相似活動的點擊事件時，預計可接受的時間差是很大的。
7.ANIMATION_START
運行Choreographer註冊動畫的時間戳。
經過計算PERFORM_TRANVERSALS_START - ANIMATION_START的值，能夠獲得評估正在運行的全部動畫器（ObjectAnimator，ViewPropertyAnimator和經常使用轉換器）所花費的時間。
若是它們的時間差很高（> 2ms），請檢查您的app是否已編寫了自定義動畫或者設置了ObjectAnimators動畫的字段，並確保它們適用於動畫。
要了解Choreographer的更多信息，請查看 For Butter or Worse 視頻。
8.PERFORM_TRAVERSALS_START
計算DRAW_START - PERFORM_TRAVERSALS_START的值，能夠獲得完成佈局和度量階段所需的時間。（注意，在滾動或動畫期間，你會但願它應該接近於零）
要了解有關渲染管道的度量和佈局階段的更多信息，請查看 Invalidations, Layouts and Performance 視頻。
9.DRAW_START
performTraversals的繪製階段開始的時間戳。這是錄製任何無效視圖的顯示列表的起點。
此時間與SYNC_START之間的時間是在樹中全部無效視圖上調用View.draw()所需的時間。
有關繪圖模型的更多信息，請查看 Hardware Acceleration 或者 Invalidations, Layouts and Performance 視頻。
10.SYNC_QUEUED
將同步請求發送到RenderThread的時間。
這標誌着開始同步階段的消息被髮送到RenderThread的時刻。若是此時間與SYNC_START之間的時間差很長（> 0.1ms左右），則表示RenderThread正忙於處理不一樣的幀。在內部，這用於區分執行太多工做以致於超過16ms預算的幀和因爲前一幀超過16ms預算而致使被中止的幀。
11.SYNC_START
繪圖同步階段開始的時間。
若是此時間與ISSUE_DRAW_COMMANDS_START之間的時間很長（> 0.4ms左右），則一般表示已繪製了許多必須上傳到GPU的新位圖。
要了解有關同步階段的更多信息，請查看 Profile GPU Rendering 視頻。
12.ISSUE_DRAW_COMMANDS_START
硬件渲染器開始向GPU發出繪圖命令的時間。
計算FRAME_COMPLETED - ISSUE_DRAW_COMMANDS_START的值，能夠大體瞭解app生成多少GPU工做。這裏會出現不少過分繪製或低效的渲染效果等問題。
13.SWAP_BUFFERS
調用eglSwapBuffers的時間，在平臺工做以外相對無用。
14.FRAME_COMPLETED
幀的結束時間戳。能夠經過執行FRAME_COMPLETED - INTENDED_VSYNC來計算在此幀上工做的總時間。
15.DequeueBufferDuration和QueueBufferDuration
我測試的是Android 8.0版本，除了以上14列數據外，還有2列數據——DequeueBufferDuration和QueueBufferDuration，這2列數據在官方文檔中沒有說起，估計是後來新加的。
你能夠用不一樣的方式使用這些數據。例以下面的直方圖，顯示不一樣幀時間的分佈（FRAME_COMPLETED - INTENDED_VSYNC）。
這個圖表一目瞭然地告訴咱們，大多數幀都很是好——大多數的幀耗時都遠低於16ms（用紅色表示），但幾幀明顯超過了16ms。隨着時間的推移，咱們能夠查看此直方圖中的變化，以查看批量變化或新建立的異常值。您還能夠根據數據中的許多時間戳來繪製出輸入延遲，佈局花費的時間或其餘相似的感興趣度量。
三 幀耗時數據的獲取
若是在開發人員選項中將配置文件Profile GPU rendering爲In adb shell dumpsys gfxinfo，該命令將打印出最近120幀耗時信息，並將其分紅幾個不一樣的類別，能夠直觀地顯示各部分的快慢。
與上面的framestats相似，將它粘貼到咱們選擇的電子表格工具，或者使用腳本進行收集和解析很是簡單。下圖顯示了app生成的許多幀耗時的細分。
此結果能夠經過運行gfxinfo，複製輸出，將其粘貼到電子表格工具中，並將數據繪製爲直方圖獲取。
每一個垂直條表明一幀動畫，它的高度表示計算動畫幀所用的毫秒數。條形圖的每一個彩色部分表明渲染管道的不一樣階段，所以您能夠看到app的哪些部分可能會產生瓶頸。有關了解渲染管道以及如何對其進行優化的詳細信息，請查看 Invalidations Layouts and Performance 視頻。
四 控制統計信息的收集
framestats和簡單的幀耗時信息都是在很是短的時間內收集數據——大約2s收集一次（一次120幀，一幀16ms，耗時約2s）。爲了精確控制此時間窗口，例如，將數據限制爲特定的動畫，您能夠重置全部計數器，並從新聚合統計信息。
adb shell dumpsys gfxinfo <PACKAGE_NAME> reset
這也能夠與dumps命令一塊兒使用，以常規節奏進行收集和重置，連續得到少於2s的幀數據。
五 如何診斷性能問題
dumpsys能發現問題或者判斷問題的嚴重性，但沒法定位真正的緣由。若是要定位緣由並找到解決它們的適當方法，強烈建議使用systrace工具。
六 其餘資源
有關Android渲染管道如何工做的更多信息，您能夠在如下找到常見的問題以及如何解決這些問題，下面某些資源可能對您有用：
- Rendering Performance 101
- Why 60fps?
- Android, UI, and the GPU
- Invalidations, Layouts, and Performance
- Analyzing UI Performance with Systrace
七 自動化UI性能測試
UI性能測試的其中一種方法是簡單地讓人類測試員在目標app上執行一組用戶操做，而且可視地查找問題，或者使用工具驅動的方法花費大量時間來查找問題。可是這種手動方法充滿了危險——人類感知幀速率變化的能力差異很大，並且這也是耗時，乏味且容易出錯的。
更有效的方法是從自動化UI測試中記錄和分析關鍵性能指標。Android 6.0包含新的日誌記錄功能，能夠輕鬆肯定app動畫中jank的數量和嚴重程度，並可用於構建嚴格的流程來肯定當前的性能並跟蹤將來的性能目標。
要了解有關Android性能測試的更多信息，請查看 Automated Performance Testing Codelab 。您將學習如何編寫和執行自動化測試並查看結果，以瞭解如何提升app性能。
補充
以上是我對官方文檔的一些理解翻譯，下面是另外的補充（摘自http://www.importnew.com/3784.html ）。
Gfxinfo工具是Android4.1引入的，能夠在開發者工具中看到新添加的一項「Profile GPU rendering」（GPU渲染分析）。若是在Android 4.2 及以上設備上看不見開發者選項，能夠在「關於手機」的界面底部，單擊「版本號」7次。
勾選Profile GPU rendering選項後，便可操做須要測試的界面。在終端運行下面命令：
>adb shell dumpsys gfxinfo <package_name>
在產生的日誌中，你會發現一段標記爲「Profile」的毫秒量級的數據。這段數據包含了一個有三列數據的表，應用的每一個window（窗口）都有一個這樣 的表。爲了使用這個數據，你能夠簡單的將這個表拷到你最喜歡的電子製表軟件中，從而生成一個數據堆疊的列圖。如下這個圖就是個人測量結果。
每一列給出了每一幀花在渲染上的時間估計：
「Draw」是指Java層用在建立「display lists」（顯示列表）上的時間。它代表運行例如View.onDraw(Canvas)須要多少時間。
「Process」是指Android 2D渲染引擎用在執行「display lists」上的時間。你的UI層級（hierarchy）中的View數量越多，須要執行的繪畫命令就越多。
「Execute」是指將一幀圖像交給合成器（compositor）的時間。這部分佔用的時間一般比較少。
提醒：要以60fps的幀率進行平滑的渲染，每一幀所佔用的時間須要少於16ms。
關於「Execute」:
若是Excute花費不少時間，這就意味着你跑在了系統繪圖流水線的前面。Android在運行狀態時最多能夠用3塊緩存，若是此時你的應用還須要一塊緩 存，那應用就會被阻塞直到三塊中的一塊緩存被釋放。這種狀況的發生通常有兩個緣由。第一個緣由是你的應用在Dalvik(java虛擬機)端畫的太快，而在它的Display list在GPU端執行太慢。第二個緣由是你的應用花費太多時間在前幾幀的渲染上，一旦流水線滿了，它就跟不上，直到動畫的完成。這些是咱們想在下一個版本的Android改進的地方。
以上這個圖明顯的證明了個人疑慮：這個應用在大部分時間運行良好，但某些時候會發生丟幀。
更多請查看：
英文原文：Android Performance Case Study
譯文地址: http://www.importnew.com/3784.html 編譯：ImportNew - 孫立
個人測試實踐（honor 8，Android 8.0，知乎應用）
在「開發人員選項」中勾選「GPU呈現模式分析」下的「在屏幕上呈現爲條形圖」，而後執行命令
>adb shell dumpsys gfxinfo com.zhihu.android > E:/log/zhihu-tiaoxingtu.txt
輸出結果以下所示
Applications Graphics Acceleration Info: Uptime: 2146035727 Realtime: 3258300362 ** Graphics info for pid 5566 [com.zhihu.android] ** Stats since: 2145917787705821ns Total frames rendered: 1542 Janky frames: 414 (26.85%) 50th percentile: 13ms 90th percentile: 24ms 95th percentile: 30ms 99th percentile: 69ms Number Missed Vsync: 27 Number High input latency: 8 Number Slow UI thread: 256 Number Slow bitmap uploads: 10 Number Slow issue draw commands: 140 HISTOGRAM: 5ms=35 6ms=89 7ms=79 8ms=113 9ms=80 10ms=85 11ms=125 12ms=136 13ms=119 14ms=108 15ms=104 16ms=70 17ms=78 18ms=52 19ms=40 20ms=19 21ms=18 22ms=19 23ms=14 24ms=14 25ms=19 26ms=11 27ms=11 28ms=11 29ms=9 30ms=15 31ms=7 32ms=9 34ms=10 36ms=2 38ms=2 40ms=4 42ms=4 44ms=2 46ms=0 48ms=5 53ms=3 57ms=2 61ms=1 65ms=2 69ms=2 73ms=1 77ms=1 81ms=1 85ms=0 89ms=2 93ms=0 97ms=0 101ms=0 105ms=0 109ms=0 113ms=0 117ms=1 121ms=0 125ms=0 129ms=0 133ms=0 150ms=5 200ms=0 250ms=0 300ms=0 350ms=3 400ms=0 450ms=0 500ms=0 550ms=0 600ms=0 650ms=0 700ms=0 750ms=0 800ms=0 850ms=0 900ms=0 950ms=0 1000ms=0 1050ms=0 1100ms=0 1150ms=0 1200ms=0 1250ms=0 1300ms=0 1350ms=0 1400ms=0 1450ms=0 1500ms=0 1550ms=0 1600ms=0 1650ms=0 1700ms=0 1750ms=0 1800ms=0 1850ms=0 1900ms=0 1950ms=0 2000ms=0 2050ms=0 2100ms=0 2150ms=0 2200ms=0 2250ms=0 2300ms=0 2350ms=0 2400ms=0 2450ms=0 2500ms=0 2550ms=0 2600ms=0 2650ms=0 2700ms=0 2750ms=0 2800ms=0 2850ms=0 2900ms=0 2950ms=0 3000ms=0 3050ms=0 3100ms=0 3150ms=0 3200ms=0 3250ms=0 3300ms=0 3350ms=0 3400ms=0 3450ms=0 3500ms=0 3550ms=0 3600ms=0 3650ms=0 3700ms=0 3750ms=0 3800ms=0 3850ms=0 3900ms=0 3950ms=0 4000ms=0 4050ms=0 4100ms=0 4150ms=0 4200ms=0 4250ms=0 4300ms=0 4350ms=0 4400ms=0 4450ms=0 4500ms=0 4550ms=0 4600ms=0 4650ms=0 4700ms=0 4750ms=0 4800ms=0 4850ms=0 4900ms=0 4950ms=0 Caches: Current memory usage / total memory usage (bytes): TextureCache 0 / 75497472 Layers total 0 (numLayers = 0) RenderBufferCache 0 / 8388608 GradientCache 0 / 1048576 PathCache 0 / 33554432 TessellationCache 0 / 1048576 TextDropShadowCache 0 / 6291456 PatchCache 0 / 0 FontRenderer doesn't exist. Other: FboCache 0 / 2 Total memory usage: 0 bytes, 0.00 MB Pipeline=FrameBuilder Profile data in ms: com.zhihu.android/com.zhihu.android.app.ui.activity.MainActivity/android.view.ViewRootImpl@108398b (visibility=8) Draw Prepare Process Execute 1.91 0.74 6.35 1.76 10.42 0.73 4.52 1.77 1.95 0.70 9.78 2.12 1.96 0.92 6.02 1.93 1.88 1.06 6.16 2.58 2.47 1.02 5.39 2.25 2.53 1.04 5.44 2.33 2.75 1.00 7.00 2.66 2.57 1.13 6.21 2.44 6.08 1.58 5.28 3.58 3.90 1.83 8.05 4.41 3.47 1.49 7.00 3.30 3.97 1.08 4.25 2.31 2.33 0.78 4.12 2.26 1.96 0.74 5.42 1.86 1.72 1.10 4.63 1.67 1.63 0.73 4.36 1.62 1.42 0.86 4.90 2.01 6.32 1.36 8.52 3.01 4.55 1.10 6.42 3.72 8.18 0.88 5.40 2.71 4.24 0.86 4.11 2.04 6.11 0.91 3.77 1.84 5.22 0.72 6.50 1.87 4.18 0.41 4.23 1.72 4.13 0.87 3.94 1.90 3.62 0.96 7.41 2.03 4.59 0.85 3.77 1.84 4.83 0.72 3.96 2.01 5.37 0.71 3.70 1.68 3.41 0.96 4.24 1.72 3.46 0.83 4.55 1.88 2.98 0.70 4.81 1.85 3.52 0.94 4.27 2.03 5.36 0.70 3.82 1.71 3.38 0.93 4.13 1.71 6.01 1.25 5.89 2.92 7.39 1.17 9.01 2.68 9.79 1.31 16.11 4.10 9.81 0.75 14.20 3.72 13.28 1.77 11.97 3.82 14.87 1.91 10.70 7.43 31.82 0.99 8.60 2.06 8.42 0.78 6.58 1.83 4.38 0.81 5.54 1.96 3.81 0.85 5.48 1.89 3.80 1.14 5.76 1.80 3.67 1.20 5.35 1.75 4.29 0.81 5.80 1.96 4.37 0.99 5.40 2.02 5.10 0.77 5.39 1.80 3.99 1.02 5.17 1.99 4.20 0.94 5.11 1.75 2.96 0.75 6.41 1.70 2.93 0.93 5.80 1.79 2.78 0.82 7.04 1.93 3.59 1.07 5.77 1.84 4.14 1.06 6.67 2.47 6.35 1.04 6.82 2.57 5.84 1.05 6.16 2.55 3.75 1.24 7.44 2.63 6.43 1.01 6.59 2.64 3.73 1.51 6.78 2.54 4.93 1.07 6.83 2.50 6.09 1.06 7.38 2.52 4.30 1.31 7.37 2.54 4.07 1.09 9.62 3.96 8.27 1.37 8.60 4.31 3.74 0.93 8.39 12.89 7.61 0.83 7.47 1.83 14.74 0.82 6.05 1.87 6.52 0.82 5.43 2.08 5.62 0.76 5.48 1.82 5.92 0.76 10.58 2.19 5.00 0.78 8.08 1.93 50.00 2.83 6.46 2.16 50.00 0.88 7.23 1.83 3.61 0.93 7.27 1.74 3.64 1.20 5.32 2.14 4.41 0.76 5.32 2.38 3.75 0.97 6.22 2.54 4.74 0.97 5.53 3.06 3.52 0.87 6.68 2.13 5.56 0.73 5.31 1.80 4.21 0.79 5.67 1.88 3.26 0.87 6.81 2.21 5.62 0.70 5.67 1.88 3.34 0.73 6.64 2.05 3.62 0.84 5.82 2.14 5.01 6.90 5.13 2.01 4.37 0.82 7.01 1.73 4.90 0.75 4.13 1.76 4.53 0.96 4.06 1.80 3.60 0.98 4.39 1.83 3.92 0.84 4.29 1.72 4.43 0.90 4.49 1.91 3.58 1.09 5.63 1.64 3.46 0.92 5.69 1.64 8.53 0.84 8.19 3.02 10.41 1.29 10.69 3.59 9.71 1.14 13.76 2.70 7.31 1.05 8.99 2.71 6.50 1.15 7.68 3.57 6.37 1.14 8.01 1.90 8.11 0.80 6.61 1.98 4.42 1.27 5.92 2.16 4.33 0.89 5.49 1.91 5.70 0.78 5.39 1.93 3.97 0.98 5.59 1.80 3.72 0.87 5.68 1.73 6.03 0.77 5.77 1.66 5.60 0.75 5.52 1.73 4.02 0.90 5.65 1.68 2.98 0.97 6.31 2.15 3.04 0.92 6.31 1.73 2.77 1.07 6.36 1.84 3.43 0.87 7.68 1.99 4.85 0.91 6.15 1.97 1.33 0.83 9.52 2.77 26.07 0.79 4.95 1.70 com.zhihu.android/com.zhihu.android.app.ui.activity.QAHostActivity/android.view.ViewRootImpl@e8b0a68 (visibility=4) Draw Prepare Process Execute 10.08 0.40 6.08 1.59 5.85 0.38 4.19 1.48 5.09 0.39 6.83 1.56 5.52 0.44 6.03 1.95 6.77 0.41 4.90 1.93 5.14 0.39 7.49 1.62 5.88 0.38 4.92 2.51 5.34 0.43 6.99 2.03 5.62 0.41 5.14 1.72 5.03 0.43 6.06 1.57 5.59 0.39 5.34 1.63 5.46 0.41 6.60 1.52 5.51 0.40 5.12 1.72 4.76 0.48 4.89 1.74 4.74 0.40 6.06 1.37 5.19 0.51 5.25 1.71 4.91 0.49 9.86 1.84 7.42 0.40 10.30 3.85 6.09 0.44 5.23 1.80 5.21 0.49 6.40 1.94 6.46 1.02 7.08 1.80 5.82 0.40 5.14 2.84 6.78 0.49 7.34 1.79 6.45 0.52 5.45 1.70 6.77 0.40 6.02 2.34 7.03 0.44 6.94 1.49 5.37 0.40 6.11 1.77 4.93 0.41 5.20 1.60 7.17 0.42 5.50 1.80 7.51 0.44 6.28 2.01 5.46 0.43 6.50 1.62 5.17 0.41 5.54 1.88 5.64 0.39 5.46 1.67 4.75 0.41 4.92 1.66 4.75 0.39 6.11 1.57 6.58 0.44 4.82 1.78 4.86 0.43 5.02 1.63 4.60 0.41 5.29 1.66 4.86 0.39 5.30 1.71 4.61 0.53 5.00 1.67 5.79 0.38 4.94 1.87 5.52 0.51 4.91 1.74 4.78 1.31 4.86 1.65 4.70 0.40 6.72 1.73 4.82 0.41 4.96 1.73 4.77 0.39 6.11 1.56 6.67 0.40 4.79 1.70 4.87 0.41 5.19 1.87 4.86 0.39 5.01 1.83 4.48 0.40 6.47 1.73 4.70 0.41 5.73 1.87 4.62 0.42 6.22 1.58 4.99 0.40 5.42 1.67 5.31 0.39 5.99 1.56 5.11 0.42 6.53 2.21 7.55 0.60 6.59 2.67 7.40 0.56 6.90 2.70 7.03 0.73 8.17 3.97 9.59 0.55 7.83 5.02 10.94 0.51 5.59 1.93 6.82 0.42 7.59 4.42 6.94 0.42 5.58 1.99 8.14 0.41 5.70 1.76 4.83 0.41 5.52 1.70 5.86 0.46 5.65 1.91 7.27 0.51 5.21 1.81 6.47 0.42 5.55 1.83 8.56 0.38 6.93 2.05 7.47 0.41 6.60 2.52 8.12 0.39 5.20 2.57 5.19 0.43 6.40 1.77 7.75 0.39 5.08 1.77 6.31 0.42 5.33 1.95 6.47 0.25 5.25 1.78 6.56 0.39 5.24 1.66 4.79 0.42 4.99 1.70 5.12 0.41 4.61 1.88 5.62 0.40 4.90 1.59 5.50 0.40 5.95 1.85 6.09 0.32 4.85 1.65 2.75 0.31 6.37 1.92 2.58 0.31 4.46 2.14 6.91 0.28 10.89 3.26 5.69 0.31 4.53 2.17 1.72 0.29 6.18 1.61 1.88 0.97 5.62 1.67 1.70 0.30 6.53 1.79 1.81 0.97 5.45 1.72 1.67 0.29 6.64 1.67 1.74 0.28 6.39 1.67 1.75 0.75 5.72 1.69 1.72 0.30 6.45 1.65 1.71 0.37 6.34 2.07 1.75 0.60 6.01 1.70 1.73 0.29 6.53 1.67 1.68 0.29 6.50 1.87 1.26 0.32 7.00 1.71 7.10 0.49 12.71 3.40 19.43 0.43 6.42 2.08 15.03 0.68 6.03 3.95 10.45 0.48 5.02 1.88 8.49 0.43 5.51 2.24 8.16 0.41 4.97 2.09 7.87 0.42 5.48 1.83 2.81 0.36 6.43 1.98 7.57 1.22 19.97 14.92 6.90 1.83 14.12 6.48 19.60 0.47 6.10 2.57 3.95 0.43 11.00 2.01 2.60 0.30 12.31 1.85 2.38 0.36 14.06 1.99 1.87 0.31 14.93 2.01 1.92 0.41 4.41 2.10 2.92 0.39 6.54 3.33 2.47 0.40 6.45 2.62 3.33 0.46 6.54 2.86 3.57 0.60 6.58 2.77 3.28 0.44 6.73 2.29 2.09 0.35 5.05 1.94 1.91 0.45 5.65 2.17 View hierarchy: com.zhihu.android/com.zhihu.android.app.ui.activity.MainActivity/android.view.ViewRootImpl@108398b 307 views, 242.24 kB of display lists com.zhihu.android/com.zhihu.android.app.ui.activity.QAHostActivity/android.view.ViewRootImpl@e8b0a68 82 views, 64.70 kB of display lists Total ViewRootImpl: 2 Total Views: 389 Total DisplayList: 306.95 kB
而後我發如今「Profile」中有4列數據：Draw Prepare Process Execute。比上述多了一列Prepare，估計是新版本增長的？暫時還未研究。
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