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前言：

Systrace是分析Android性能问题的神器。一般抓trace命令是需要在AndroidSDK下的\platform-tools\systrace执行\systrace.py，很奇怪我的AndroidSDK并没有systrace文件夹，于是CSDN单独下载了trace文件 但是我一运行.\systrace.py -b 10240 -t gfx input view webview wm sm audio camera hal res -o trace.html就奔溃。最终发现还是懒人方法适合我，即使用adb命令和开发者选项抓取trace

方法一：adb 命令抓取trace

没想到直接adb命令进行抓取就可以，既然有这个自行车，还要啥systrace.py

adb shell perfetto -o /data/misc/perfetto-traces/trace_file.perfetto-trace -t 20s sched freq idle am wm gfx view

要更改抓取时间则将 -t 后面的值替换即可，如果要增加缓存大小，则加 -b 对应的大小值mb

发命令示例：adb shell perfetto -o /data/misc/perfetto-traces/trace_file.perfetto-trace -t 20s sched freq idle am wm gfx view​Warning: No PTY. CTRL+C won't gracefully stop the trace. If you are running perfetto via adb shell, use the -tt arg (adb shell -t perfetto ...) or consider using the helper script tools/record_android_trace from the Perfetto repository.​[269.031]    perfetto_cmd.cc:1051 Connected to the Perfetto traced service, TTL: 20s[289.232]    perfetto_cmd.cc:1213 Wrote 2001382 bytes into /data/misc/perfetto-traces/trace_file.perfetto-trace // trace的存放目录

trace所支持的类别，可以使用adb shell atrace --list_categories 查看 ：

adb shell atrace --list_categories         gfx - Graphics       input - Input        view - View System     webview - WebView          wm - Window Manager          am - Activity Manager          sm - Sync Manager       audio - Audio       video - Video      camera - Camera         hal - Hardware Modules         res - Resource Loading      dalvik - Dalvik VM          rs - RenderScript      bionic - Bionic C Library       power - Power Management          pm - Package Manager          ss - System Server    database - Database     network - Network         adb - ADB    vibrator - Vibrator        aidl - AIDL calls       nnapi - NNAPI         rro - Runtime Resource Overlay         pdx - PDX services       sched - CPU Scheduling         irq - IRQ Events         i2c - I2C Events        freq - CPU Frequency        idle - CPU Idle        disk - Disk I/O        sync - Synchronization       workq - Kernel Workqueues  memreclaim - Kernel Memory Reclaim  regulators - Voltage and Current Regulators  binder_driver - Binder Kernel driver  binder_lock - Binder global lock trace   pagecache - Page cache      memory - Memory     thermal - Thermal event

trace的存放目录 /data/misc/perfetto-traces/trace_file.perfetto-trace，使用adb pull导出即可

C:\Users\fadi.su>adb pull /data/misc/perfetto-traces/trace_file.perfetto-trace C:\Users\fadi.su\Desktop\traceTest/data/misc/perfetto-traces/trace_file.perfetto-trace: 1 file pulled, 0 skipped. 1.7 MB/s (2001382 bytes in 1.132s)

方法二：开发者选项抓取trace

具体开发者选项->系统跟踪：记录CPU性能分析结果，如果需要指定类别也可以勾选

trace的存放目录：/data/local/traces/，使用adb pull导出即可

C:\Users\fadi.su>adb pull /data/local/traces C:\Users\fadi.su\Desktop\traceTest/data/local/traces/: 1 file pulled, 0 skipped. 2.6 MB/s (940553 bytes in 0.342s)

Google浏览器使用perfetto打开trace文件

输出trace的地址：https://ui.perfetto.dev/

将trace文件拖拽进去就行，由于需要解析和绘制html，故需要等一下。例如我的是下述解析结果。

学了下还是挺方便的。和功耗分析的BugReport类似的分析界面。