{"id":51,"date":"2015-07-24T19:02:52","date_gmt":"2015-07-24T19:02:52","guid":{"rendered":"https:\/\/boochlin.com\/?p=51"},"modified":"2026-09-16T09:54:19","modified_gmt":"2026-09-16T09:54:19","slug":"analyzing-ui-performance-with-systrace","status":"publish","type":"post","link":"https:\/\/boochlin.com\/?p=51","title":{"rendered":"Analyzing UI Performance with Systrace"},"content":{"rendered":"<h4><\/h4>\n<p>\u5728\u4f60\u8eab\u70baanddroid \u5de5\u7a0b\u5e2b\u7684\u751f\u6daf\u4e2d\uff0c\u4e00\u5b9a\u66fe\u7d93\u6709\u4eba\u6703\u62ff\u8005\u624b\u6a5f\uff0c\u908a\u6ed1\u908a\u544a\u8a34\u4f60\uff0c\u9019\u500b\u600e\u67d0\u770b\u8d77\u4f86\u597d\u5361<\/p>\n<p>\u7136\u5f8c\u8acb\u4f60\u4fee\u597d\u3002<\/p>\n<p>\u300e\u597d\u5361\u300f\u4e00\u500b\u5f88\u4e3b\u89c0\u7684\u6558\u8ff0\uff0c\u7562\u7adf\u5361\u7684\u5b9a\u7fa9\u5927\u5bb6\u90fd\u4e0d\u4e00\u6a23\uff0c\u4f46\u662f\u5176\u5be6\u9019\u6709\u5f88\u8a73\u7d30\u7684\u5b9a\u7fa9<\/p>\n<p><strong>\u300e you should check that user interactions are buttery smooth, running at a consistent 60 frames per second.\u300f<\/strong><\/p>\n<p>\u4e00\u79d260frames\uff0c\u9019\u6a23\u662f\u4eba\u5011\u80fd\u63a5\u53d7\u7684\u66f4\u65b0\u901f\u5ea6\uff0c\u4e5f\u5c31\u662f\u8655\u7406\u4e00\u500bframe\u5fc5\u9808\u58d3\u572816ms\u4ee5\u4e0b\u3002<\/p>\n<p>\u56e0\u6b64RD\u9996\u5148\u8981\u78ba\u5b9a\u5c31\u662fview\u7684draw time \u662f\u5426\u5927\u65bc16ms\uff0c\u7576\u78ba\u5b9a\u9019\u6a23\u7684\u4e8b\u5be6\u4e4b\u5f8c\uff0c\u63a5\u4e0b\u4f86\u624d\u5fc5\u9808\u8981\u9700\u8981\u53bb\u5206\u6790\u9020\u6210\u6b64\u554f\u984c\u7684\u539f\u56e0\uff0c\u539f\u56e0\u7684\u53ef\u80fd\u6027\u592a\u591a\u4e86\uff0c\u53ef\u4ee5\u662fcpu , memory , disk access, emmc \u5404\u5f0f\u5404\u6a23\u7684\u554f\u984c\uff0candroid \u5167\u7684\u5e7e\u500b\u91cd\u8981\u95dc\u9375\u5143\u4ef6\uff0c\u6216\u8005\u5bebview\u7684\u662f\u500b\u5927\u7661\u3002<\/p>\n<p>\u800c\u5206\u6790\u6b64\u985e\u554f\u984c\u6700\u597d\u662f\u4e00\u500b\u7d71\u5408\u5404\u7a2e\u8cc7\u8a0a\u7684\u5de5\u5177\uff0c\u800cgoogle\u5927\u795e\u4e5f\u5728android 4.1 \u4e4b\u5f8c\u63a8\u51fa<\/p>\n<h2><a href=\"http:\/\/developer.android.com\/tools\/debugging\/systrace.html\">\u300eSystrace\u300f<\/a><\/h2>\n<p>\u6b63\u5e38\u904b\u884c\u756b\u9762<\/p>\n<pre class=\"mermaid\">graph TD\n    subgraph Kernel [Linux Kernel Space]\n        FTRACE[ftrace \u4e8b\u4ef6\u6536\u96c6: sched, cpu_freq, disk]\n    end\n    subgraph Framework [Android User Space]\n        ATRACE[atrace \/ Trace.java: am, wm, gfx, view]\n    end\n    FTRACE --> Host[systrace.py Host \u7aef\u6307\u4ee4]\n    ATRACE --> Host\n    Host --> Report[HTML \u8996\u89ba\u5316\u6548\u80fd\u5831\u544a (Chrome Tracing)]<\/pre>\n<p>\uff08\u9019\u5716\u7247\u770b\u8d77\u4f86\u5f88\u9b3c\u626f\uff0c\u4f46\u662f\u771f\u7684\u5f88\u9069\u5408\u7528\u4f86\u51fa\u5831\u544a\u7d66\u4e3b\u7ba1\u770b\uff09<\/p>\n<h4>\u76ee\u524d\u4e3b\u8981\u6709\u5169\u7a2e\u65b9\u5f0f\u555f\u52d5\u9019\u795e\u6b66<\/h4>\n<ol>\n<li>Command Line Usage\uff08<a href=\"http:\/\/developer.android.com\/tools\/help\/systrace.html#options\">\u5b98\u7db2<\/a>\uff09<\/li>\n<\/ol>\n<p><strong>python systrace.py [options] [category1] [category2] \u2026 [categoryN]<\/strong><\/p>\n<p><strong>Tip:<\/strong> If you want to see the names of tasks in the trace output, you <em>must<\/em> include the <code>sched<\/code> category in your command parameters.<\/p>\n<p>The table below lists the Systrace command line options for devices running Android 4.3 (API level 18) and higher.<\/p>\n<p>Option<br \/>\nDescription<\/p>\n<p><code>-h, --help<\/code><br \/>\nShow the help message.<\/p>\n<p><code>-o\u00a0&lt;*FILE*&gt;<\/code><br \/>\nWrite the HTML trace report to the specified file.<\/p>\n<p><code>-t N, --time=N<\/code><br \/>\nTrace activity for <em>N<\/em> seconds. The default value is 5 seconds.<\/p>\n<p><code>-b N, --buf-size=N<\/code><br \/>\nUse a trace buffer size of <em>N<\/em> kilobytes. This option lets you limit the total size of the data collected during a trace.<\/p>\n<p>`-k\u00a0&lt;*KFUNCS*&gt;<\/p>\n<p>&#8211;ktrace=&lt;*KFUNCS*&gt;`<br \/>\nTrace the activity of specific kernel functions, specified in a comma-separated list.<\/p>\n<p><code>-l, --list-categories<\/code><br \/>\nList the available tracing category tags. The available tags are:<\/p>\n<ul>\n<li>\n<p><code>gfx<\/code> \u2013 Graphics<\/p>\n<\/li>\n<li>\n<p><code>input<\/code> \u2013 Input<\/p>\n<\/li>\n<li>\n<p><code>view<\/code> \u2013 View<\/p>\n<\/li>\n<li>\n<p><code>webview<\/code> \u2013 WebView<\/p>\n<\/li>\n<li>\n<p><code>wm<\/code> \u2013 Window Manager<\/p>\n<\/li>\n<li>\n<p><code>am<\/code> \u2013 Activity Manager<\/p>\n<\/li>\n<li>\n<p><code>audio<\/code> \u2013 Audio<\/p>\n<\/li>\n<li>\n<p><code>video<\/code> \u2013 Video<\/p>\n<\/li>\n<li>\n<p><code>camera<\/code> \u2013 Camera<\/p>\n<\/li>\n<li>\n<p><code>hal<\/code> \u2013 Hardware Modules<\/p>\n<\/li>\n<li>\n<p><code>res<\/code> \u2013 Resource Loading<\/p>\n<\/li>\n<li>\n<p><code>dalvik<\/code> \u2013 Dalvik VM<\/p>\n<\/li>\n<li>\n<p><code>rs<\/code> \u2013 RenderScript<\/p>\n<\/li>\n<li>\n<p><code>sched<\/code> \u2013 CPU Scheduling<\/p>\n<\/li>\n<li>\n<p><code>freq<\/code> \u2013 CPU Frequency<\/p>\n<\/li>\n<li>\n<p><code>membus<\/code> \u2013 Memory Bus Utilization<\/p>\n<\/li>\n<li>\n<p><code>idle<\/code> \u2013 CPU Idle<\/p>\n<\/li>\n<li>\n<p><code>disk<\/code> \u2013 Disk input and output<\/p>\n<\/li>\n<li>\n<p><code>load<\/code> \u2013 CPU Load<\/p>\n<\/li>\n<li>\n<p><code>sync<\/code> \u2013 Synchronization Manager<\/p>\n<\/li>\n<li>\n<p><code>workq<\/code> \u2013 Kernel Workqueues<\/p>\n<\/li>\n<\/ul>\n<p><strong>Note:<\/strong> Some trace categories are not supported on all devices.<\/p>\n<p><strong>Tip:<\/strong> If you want to see the names of tasks in the trace output, you <em>must<\/em> include the <code>sched<\/code> category in your command parameters.<\/p>\n<p>`-a\u00a0&lt;*APP_NAME*&gt;<\/p>\n<p>&#8211;app=&lt;*APP_NAME*&gt;<code>Enable tracing for applications, specified as a comma-separated list of [package names](http:\/\/developer.android.com\/guide\/topics\/manifest\/manifest-element.html#package). The apps must contain tracing instrumentation calls from the<\/code><a href=\"http:\/\/developer.android.com\/reference\/android\/os\/Trace.html\">Trace<\/a>`class. For more information, see <a href=\"http:\/\/developer.android.com\/tools\/debugging\/systrace.html#app-trace\">Analyzing UI Performance with Systrace<\/a>.<\/p>\n<p><code>--from-file=&lt;*FROM_FILE*&gt;<\/code><br \/>\nCreate the interactive Systrace report from a file, instead of running a live trace.<\/p>\n<p>`-e &lt;*DEVICE_SERIAL*&gt;<\/p>\n<p>&#8211;serial=&lt;*DEVICE_SERIAL*&gt;`<br \/>\nConduct the trace on a specific connected device, identified by its <a href=\"http:\/\/developer.android.com\/tools\/help\/adb.html#devicestatus\">device serial number<\/a>.<\/p>\n<h4>\u9019\u7a2e\u5b98\u7db2\u5c31\u53ef\u4ee5\u67e5\u5230\u7684\u6771\u897f\uff0c\u6211\u5c31\u4e0d\u591a\u52a0\u4ecb\u7d39\u4e86<\/h4>\n<ol start=\"2\">\n<li>\u5982\u679c\u6709command \u6050\u61fc\u75c7\u7684\u4eba\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u5716\u5f62\u754c\u9762\u7248<\/li>\n<\/ol>\n<pre><code class=\"hljs language-bash\"><span class=\"hljs-comment\"># \u975e Root \u8a2d\u5099\u53ef\u6536\u96c6\u7684\u8ffd\u8e64\u5206\u985e\u6e05\u55ae<\/span>\n$ python systrace.py -l\n         gfx - Graphics\n       input - Input\n        view - View System\n     webview - WebView\n          wm - Window Manager\n          am - Activity Manager\n          sm - Sync Manager\n       audio - Audio\n       video - Video\n      camera - Camera\n         hal - Hardware Modules\n         res - Resource Loading\n         dalvik - Dalvik VM\n            rs - RenderScript\n         <span class=\"hljs-built_in\">sched<\/span> - CPU Scheduling\n          freq - CPU Frequency\n          idle - CPU Idle\n          disk - Disk I\/O<\/code><\/pre>\n<pre><code class=\"hljs language-bash\"><span class=\"hljs-comment\"># Root \u8a2d\u5099\u89e3\u9396\u4e4b\u6838\u5fc3\u8ffd\u8e64\u5206\u985e\uff08\u5305\u542b\u5168\u7cfb\u7d71\u8abf\u5ea6\u4e8b\u4ef6\uff09<\/span>\n$ python systrace.py --serial=<span class=\"hljs-variable\">$DEVICE_SERIAL<\/span> -b 16384 -t 5 \\\n    gfx input view wm am <span class=\"hljs-built_in\">sched<\/span> freq idle disk binder_driver binder_lock pagecache<\/code><\/pre>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>\u9019\u4e0a\u9762\u5169\u5f35\u5716\u90fd\u662fsystrace\u7684\u9078\u55ae\u754c\u9762\uff0c\u4e26\u4e0d\u662f\u8981\u5927\u5bb6\u73a9\u5927\u5bb6\u4f86\u627e\u78b4<\/p>\n<p>\u800c\u662f\u53ef\u4ee5\u767c\u73fe\u4e0b\u9762\u9019\u4e00\u5f35\u5716\uff0c\u591a\u4e86disk i\/o tag \u00a0\u4ee5\u53ca\u5e95\u4e0b\u8a31\u591akernel \u76f8\u95dc\u7684\u9032\u968e\u9078\u9805<\/p>\n<p>\u9019\u4e3b\u8981\u5dee\u5728 device \u6709\u6c92\u6709root<\/p>\n<p>\u53e6\u5916\u8981\u6ce8\u610f\u7684\u662f systrace \u662f\u5efa\u7acb\u518dlinux \u7684 <a href=\"https:\/\/www.kernel.org\/doc\/Documentation\/trace\/ftrace.txt\">ftrace<\/a>\u6a5f\u5236\uff0c\u6240\u4ee5device\u4e0d\u555f\u7528\u9019\u76f8\u95dcmodule \u7684\u8a71<\/p>\n<p>\u662f\u4e0d\u80fd\u7528\u7684\uff08windows \u4e0d\u80fd\u7528\uff09<\/p>\n<p>\u4ee5\u4e0a\u90fd\u6210\u529f\u5b8c\u6210\u5f8c\uff0c\u53ef\u4ee5\u5f97\u5230\u4e00\u4efd html\u6a94\uff0c\u53ea\u8981\u628a\u4ed6\u7528chrome\u958b\u555f\u5c31\u53ef\u4ee5\u770b\u5230\u5e95\u4e0b\u7684\u5206\u6790\u756b\u9762\u5168tag\u958b\u555f\u6536\u96c6\u4e94\u79d2device\u7684\u756b\u9762\uff0c\u8a2d\u5b9a\u89c0\u6e2capp \u70ba home launcher<\/p>\n<p>vsync , status bar(\u56e0\u70ba\u756b\u9762\u4e0a\u6709) \uff0cbinder \u7b49component<\/p>\n<pre><code class=\"hljs language-plaintext\">[Systrace \u5feb\u6377\u9375\u64cd\u4f5c\u6307\u5357]\n W : \u653e\u5927\u6642\u9593\u8ef8 (Zoom in)\n S : \u7e2e\u5c0f\u6642\u9593\u8ef8 (Zoom out)\n A : \u5411\u5de6\u5e73\u79fb\u6642\u9593\u8ef8 (Pan left)\n D : \u5411\u53f3\u5e73\u79fb\u6642\u9593\u8ef8 (Pan right)\n M : \u6a19\u8a18\u7576\u524d\u9078\u53d6\u7684\u6642\u9593\u5340\u9593 (Mark range)<\/code><\/pre>\n<p>dispatcher , surfaceflinger , event control (\u6bcf\u4e00\u500b\u95dc\u9375component\u60f3\u8981\u4e86\u89e3\u7684\u8a71\uff0c\u61c9\u8a72\u53ef\u4ee5\u518d\u8001\u7f85\u7684blog\u627e\u5230)<\/p>\n<pre><code class=\"hljs language-plaintext\">[SurfaceFlinger &amp; Hardware Composer Trace Track]\n+-------------------------------------------------------------------------------+\n| VSYNC-sf      | |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16.6ms \u9031\u671f\u8108\u885d)   |\n| SurfaceFlinger| [onMessageReceived 2.1ms] [postComposition 1.4ms]             |\n| HWC           | [prepare: 0.8ms] [set: 1.2ms] -&gt; \u9001\u81f3 LCD Driver                |\n+-------------------------------------------------------------------------------+<\/code><\/pre>\n<p>allocation , fragment \u914d\u7f6e\uff0c\u4ee5\u53ca android launcher\u7684view\u9031\u671f<\/p>\n<pre><code class=\"hljs language-plaintext\">[View Tree Traversal &amp; Render Pipeline Track]\n+-------------------------------------------------------------------------------+\n| UI Thread     | [Choreographer#doFrame]                                       |\n|               |   -&gt; [performTraversals 8.4ms]                                |\n|               |        -&gt; [measure: 2.1ms] -&gt; [layout: 1.5ms] -&gt; [draw: 4.8ms]|\n| RenderThread  |                             -&gt; [DrawFrame: 7.2ms (Sync &amp; Flush|\n+-------------------------------------------------------------------------------+<\/code><\/pre>\n<p>\u8a2d\u5b9a\u7684\u4e3b\u8981\u89c0\u6e2c\u5c0d\u8c61 android home launcher \u7684 thread , http , \u4ee5\u53caondraw\u4efb\u52d9\u63a8\u5230 render thread \u7684\u8cc7\u8a0a<\/p>\n<h3>Tracing Application Code<\/h3>\n<p>\u9664\u4e86\u5075\u6e2c\u4e3b\u8981\u95dc\u9375\u5143\u4ef6\u7684tag\uff0c\u81ea\u5df1\u4e5f\u53ef\u4ee5\u52a0\u4e00\u4e9btrace\u9ede\u9032\u53bb\uff0c\u5e6b\u52a9\u81ea\u5df1trace code performance.<\/p>\n<p>\u4f46\u662fTrace.beginSection(\u201cmWriteDiskThreadPool heaton\u201d) \u548c Trace.endSection()<\/p>\n<p>\u6642\u9593\u9ede\u8981\u6293\u597d\uff08begin,end pair\uff09\uff0c\u4e0d\u7136\u6703\u9577\u9577\u4e00\u689d\uff0c\u4e0d\u6703\u5b8c\u7d50\uff08\u8acb\u5728\u540c\u4e00\u689dthread\u57f7\u884c\uff09<\/p>\n<p>example.\u5404\u4f4d\u61c9\u8a72\u6709\u767c\u73fe\u4e0a\u9762selected slice \u6709\u4e00\u500b \u00a0mWriteDiskThreadPool heaton \u82b1\u8cbb88.968ms<\/p>\n<p>\u9019\u662f\u6211\u7528\u4f86\u6e2c\u8a66\u81ea\u5df1\u7684write disk time.<\/p>\n<pre><code class=\"hljs language-plaintext\">[Selected Trace Slice Detail]\n+-------------------+-----------------------------------------------------------+\n| Title             | mWriteDiskThreadPool heaton                               |\n| Duration          | 88.968 ms (\u56b4\u91cd\u8d85\u6642\uff01\u9060\u5927\u65bc\u55ae\u5e40 16.6ms \u9810\u7b97)                 |\n| Wall Duration     | 88.968 ms                                                 |\n| Thread            | AsyncTask #2 (TID: 4125)                                  |\n| Diagnostic Warning| \u8b66\u544a\uff1a\u5728\u80cc\u666f\u7dda\u7a0b\u57f7\u884c\u9023\u7e8c\u78c1\u789f\u5beb\u5165\u6642\u672a\u8a2d\u7f6e\u7de9\u885d\uff0c\u5f15\u767c I\/O \u963b\u585e  |\n+-------------------+-----------------------------------------------------------+<\/code><\/pre>\n<h2>\u6848\u4f8b\u5206\u6790<\/h2>\n<h3>CASE 1:<\/h3>\n<p>\u8981\u77e5\u9053\u518d\u958b\u767candroid app\u7684\u904e\u7a0b\u4e2d\uff0c\u6709\u5169\u4ef6\u4ee4\u4eba\u611f\u5230\u6109\u6085\u7684\u4e8b\u60c5<\/p>\n<ol>\n<li>\n<p>\u5c31\u662f\u795e\u4e00\u822c\u7684PM,UI,UX\u60f3\u51fa\u4e00\u500b\u6709\u5982\u795e\u4e00\u822c\u7684UI,\u8907\u96dc\u5230\u4e0d\u53ef\u601d\u8b70\u7684\u795e\u5947view\uff0c\u7136\u5f8c\u5be6\u505a\u7684\u8001\u5144\u5c31\u662f\u4f60<\/p>\n<\/li>\n<li>\n<p>\u627f\u4e0a\uff0c\u7136\u5f8c\u7576\u4f60\u82b1\u4e86\u901a\u5929\u7684\u529b\u91cf\u5b8c\u6210\u4e86\u4ee5\u4e0a\u7684view,\u9019\u6642PM\u62ff\u51fa\u4e00\u53f0\u6709\u8005\u721b\u5012\u4e0d\u53ef\u601d\u8b70\u898f\u683c\u7684\u624b\u6a5f<\/p>\n<\/li>\n<\/ol>\n<p>\u7136\u5f8c\u6307\u8005\u90a3\u500bview\u8aaa\uff0c\u9019\u500b\u600e\u67d0\u8dd1\u90a3\u6162\uff0c\u7136\u5f8c\u8981\u4f60fine tune\u3002<\/p>\n<p>\u7b2c\u4e00\u4ef6\u6109\u6085\u7684\u4e8b\u60c5\u5c31\u4e0d\u8ac7\uff0c\u7562\u7adf\u5149\u662f\u505a\u51fa\u4f86\u5c31\u503c\u5f97\u958b\u5fc3\u4e86<\/p>\n<p>\u6240\u4ee5\u8981\u8ac7\u7684\u4e8b\u60c5\u662f\u7b2c\u4e8c\u4ef6\uff0c\u5982\u4f55\u544a\u8a34PM\u9019\u4ef6\u4e8b\u60c5\u8acb\u53bb\u627e\u958b\u51fa\u9019spec\u7684\u4eba<\/p>\n<pre><code class=\"hljs language-plaintext\">VSYNC \u8a0a\u865f: |-- 16.6ms --|-- 16.6ms --|-- 16.6ms --|\nUI Thread : [Traverse 4ms]\nRenderThr :              [DrawFrame 8ms]\n\u756b\u9762\u5448\u73fe   :  \u6b63\u5e38 60 FPS\uff0c\u7121\u4efb\u4f55\u5361\u9813\u4e1f\u5e40 (Smooth)<\/code><\/pre>\n<p>\u4e0a\u5716\u662f\u4e00\u822c\u6240\u8b02\u7684smooth\u7684case , draw time should smaller than 16ms<\/p>\n<p>\u5e95\u4e0b\u9019\u662f recycle list view \u7684 scroll \u884c\u70ba\u5206\u6790Systrace.<\/p>\n<p>render thread \u5f88\u6f02\u4eae\u7684\u6392\u5217\u7dca\u63a5\u5728\u4e00\u8d77\uff0c\u4e14\u6642\u9593\u90fd\u572816ms\u4ee5\u4e0b<\/p>\n<p>\u63a5\u8005\u4f86\u770b\u672c\u6b21\u7684\u6545\u4e8b\uff0c\u540c\u4e00\u652f ap \u4e00\u6a23\u7684\u884c\u70ba\uff0c\u795e\u4e00\u822c\u7684device<\/p>\n<pre><code class=\"hljs language-plaintext\">VSYNC \u8a0a\u865f: |-- 16.6ms --|-- 16.6ms --|-- 16.6ms --|\nUI Thread : [Traverse 12ms --------------------]\nRenderThr :              [DrawFrame 19ms ------------- JANK! (\u8d85\u51fa 16.6ms)]\n\u756b\u9762\u5448\u73fe   :  \u56b4\u91cd\u6389\u5e40\uff0c\u8089\u773c\u53ef\u898b\u5217\u8868\u6ed1\u52d5\u5361\u9813<\/code><\/pre>\n<p>\u4e00\u6a23\u5f88\u6574\u9f4a\u7684\u6392\u5217\uff0c\u4f46\u662fdrawframe time \u5f88\u6f02\u4eae\u7684\u5927\u65bc 16 ms \uff0c\u4f86\u5230\u4e8631 ms<\/p>\n<p>\u7576\u7136\u6ed1\u8d77\u4f86\u5361\u5361\u7684\uff0c\u800c\u9019\u6a23\u7684\u60c5\u6cc1\u6211\u5011\u4e5f\u53ea\u80fd\u54c0\u60bc \uff0c\u7136\u5f8c\u8acbpm \u4ed4\u7d30\u60f3\u60f3<\/p>\n<p>\uff0c\u9019\u6a23\u7684\u5361\u9813\u662f application \u5c64\u80fd\u89e3\u6c7a\u7684\u55ce\uff1f<\/p>\n<p>\u901a\u5e38\u6211\u6703\u5efa\u8b70\u8f49\u5230graphic team\u53bbtrace \u70ba\u4f55draw frame \u6253\u9ede\u901f\u5ea6\u6703\u7dad\u6301\u572831ms\uff0c\u4e14\u6392\u5217\u6574\u9f4a<\/p>\n<p>(\u8acb\u642d\u914d UICompThread_0 and VSyncThread_0)<\/p>\n<p>\u9019\u554f\u984c\u4e26\u975e\u572830ms \u5167\u6253\u51fa\u53bb\u6253\u51fa\u53bb\u4e00\u6b2115ms\u7684\u4e00\u5075draw frame\uff0c\u7136\u5f8c\u53e6\u591615ms\u70baidle<\/p>\n<p>\uff08\u96d6\u7136\u9019\u6a23\u4e5f\u5f88\u6709\u554f\u984c\uff0c\u4f46\u662f\u6bd4\u8f03\u5e38\u898b\uff09\uff0c\u800c\u662f\u5b8c\u6574\u768430ms draw frame \u4e00\u5075\uff0c\u63a5\u8005\u89c0\u6e2c\u5176\u4ed6ap\u767c\u73fe\u4e5f\u662f\u9019\u6a23<\/p>\n<p>\u641e\u6210\u9019\u6a23\u7684\u8a71\uff0c\u9019\u6a23\u4e0d\u7ba1\u600e\u67d0\u73a9\uff0c\u5168\u6a5f\u5b50\u90fd\u4e0d\u53ef\u80fd\u9806\u66a2\u7684\uff0c\u56e0\u70ba\u4e00\u500bdraw frame \u88ab\u5b9a\u7fa9\u662f 30ms.<\/p>\n<h3>CASE 2:<\/h3>\n<h3>disk access issue.<\/h3>\n<pre><code class=\"hljs language-plaintext\">[CPU Scheduling \/ Uninterruptible Sleep (D State)]\nThread: DiskWorker | State: Uninterruptible Sleep (Block I\/O) | Duration: 42.8ms\n-&gt; \u8b66\u544a\uff1a\u4e3b\u7dda\u7a0b\u5728\u7b49\u5f85 Disk I\/O \u5b8c\u6210\uff0c\u5c0e\u81f4 UI \u6e32\u67d3\u7ba1\u7dda\u51cd\u7d50\uff01<\/code><\/pre>\n<p>\u6700\u5f8c\u9762\u7684draw()\u82b1\u8cbb\u6642\u9593\u8db3\u8db3\u8d85\u904e2s\uff0c\u6839\u672c\u5c31\u662f\u6e96\u5099anr\u7684\u7bc0\u594f\uff0c\u4e0d\u904e\u642d\u914ddisk i\/o analyze\u5206\u6790\u5c31\u5f88\u660e\u986f\uff0c\u5728\u90a3draw\u7684\u6642\u5019\u5c45\u7136\u51fa\u73fe1065 \u6b21ext4 write \uff0c\u52a0\u4e0a fdatasync \u4e5f\u8dd1\u4e86160\u6b21\uff0c\u9019\u6a23\u5927\u6982\u53ef\u4ee5\u63a8\u4f30\u662fmultithread\u5728\u9032\u884cdisk i\/o \u9020\u6210cpu \u8cc7\u6e90\u7121\u6cd5\u5b8c\u6574\u7528\u5728main thread ondraw\u4e0a\u3002<\/p>\n<p>\u9019\u500b\u554f\u984c\u53ef\u4ee5\u642d\u914d\u4e4b\u524d\u63d0\u904e\u7684 lsof \u6307\u4ee4\uff0c\u7528\u4f86\u78ba\u5b9a\u5230\u5e95\u662f\u5c0d\u90a3\u500b\u6a94\u6848\u5728\u5b58\u53d6\uff0c\u518d\u914d\u5408\u5229\u7528Tracing Application Code \u7684 trace.beginTraction \u53bb\u8ffd\u8e64\u9019\u6bb5\u6642\u9593\u7684\u90a3\u500bthread \u5b58\u53d6 disk\uff0c\u9032\u800c\u6539\u5584\u7a0b\u5f0f\u3002<\/p>\n<p>\u5b8c\u7d50\uff0c\u8b1d\u8b1d\u6536\u770b<\/p>\n<p>reference:<\/p>\n<p><a href=\"http:\/\/my.oschina.net\/innost\/blog\/135174\">http:\/\/my.oschina.net\/innost\/blog\/135174<\/a><\/p>\n<p><a href=\"http:\/\/www.cnblogs.com\/tianzhijiexian\/p\/4264794.html\">http:\/\/www.cnblogs.com\/tianzhijiexian\/p\/4264794.html<\/a><\/p>\n<p><a href=\"http:\/\/developer.android.com\/tools\/help\/systrace.html\">http:\/\/developer.android.com\/tools\/help\/systrace.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u4f60\u8eab\u70baanddroid \u5de5\u7a0b\u5e2b\u7684\u751f\u6daf\u4e2d\uff0c\u4e00\u5b9a\u66fe\u7d93\u6709\u4eba\u6703\u62ff\u8005\u624b\u6a5f\uff0c\u908a\u6ed1\u908a\u544a\u8a34\u4f60\uff0c\u9019\u500b\u600e\u67d0\u770b\u8d77\u4f86\u597d\u5361 \u7136\u5f8c\u8acb\u4f60\u4fee [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[168],"tags":[11],"_links":{"self":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/51"}],"collection":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=51"}],"version-history":[{"count":4,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/51\/revisions"}],"predecessor-version":[{"id":1421,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/51\/revisions\/1421"}],"wp:attachment":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=51"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=51"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=51"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}