systrace

阿里P7移动互联网架构师进阶视频（每日更新中）免费学习请点击： https://space.bilibili.com/474380680 本篇文章将继续以下两个内容来介绍启动速度与执行效率优化: [StrictMode 详解] [Systrace和TraceView] 一 StrictMode 详解 1.1 如何启用 StrictMode 我们通常在 Activity 或者自定义的Application类中启动 StrictMode，代码如下： public void onCreate() { if (DEVELOPER_MODE) { StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder() .detectDiskReads() .detectDiskWrites() .detectNetwork() // or .detectAll() for all detectable problems .penaltyLog() .build()); StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder() .detectLeakedSqlLiteObjects() .detectLeakedClosableObjects() .penaltyLog()

My code works well with malloc , but not with mmap . The code is below: main.c #include <stdio.h> #include <stdlib.h> int main(){ int * p = (int*) malloc(sizeof(int)); printf("in main(): value p = %d\n", *p); free(p); } preload.c #define _GNU_SOURCE #include <time.h> #include <dlfcn.h> #include <stdio.h> #include <sys/types.h> void *(*orig_malloc)(size_t size); void *malloc(size_t size){ printf(" Hooked(preload)! malloc:size:%lu\n", size); return orig_malloc(size); } void * (*orig_mmap)(void *start, size_t length, int prot, int flags, int fd, off_t offset); void * mmap(void *start, size_t

I'm trying to measure performance attributes of my app through systrace by using the new Trace API introduced in JB 4.3. The idea is similar to the use of traceview method profiling, i.e. you can measure a specific code section using Trace.beginSection and Trace.endSection . However, when I run systrace through the python script provided in Android tools, I don't see anything relating to the sections specified by the above calls. Am I missing something? Is this the correct way of accessing the systrace output? I see in the documentation for the Trace calls that it "Writes trace events to the

I ran systrace on my android studio project in order to find some performance bugs but after the end of the tracing process, i get the following error and if i open the trace.html output file in chrome, the trace view is empty: Starting tracing (10 seconds) Tracing completed. Collecting output... Exception in thread Thread-13: Traceback (most recent call last): File "C:\Python27\lib\threading.py", line 801, in __bootstrap_inner self.run() File "C:\Python27\lib\threading.py", line 754, in run self.__target(*self.__args, **self.__kwargs) File "C:\Users\Steli\AppData\Local\Android\sdk\platform

Here's the error message D:\Programming\Tools\ADT_bundle\sdk\platform-tools\systrace>python systrace.py Traceback (most recent call last): File "systrace.py", line 315, in <module> main() File "systrace.py", line 64, in main os.execv(legacy_script, sys.argv) OSError: [Errno 2] No such file or directory I look into systrace.py, it seems that the legacy_script "systrace-legacy.py" is missing on the file system. I have read several related posts on stackoverflow, and I've already put directory containing adb in the %PATH%. The problem still exists. I'm writting to ask if any way to solve this

设备上获取错误报告：使用设备上的生成错误报告开发者选项、Android Emulator 菜单或开发计算机上的 adb bugreport 命令。（要获取错误报告，您必须在设备上启用 开发者选项 ，以便访问 生成错误报告 选项。） 1.设备上的生成错误报告 请执行以下操作： 确保您已启用 开发者选项 。 在 开发者选项 中，点按生成错误报告。 选择所需的错误报告类型，然后点按 报告 。稍后，您便会收到错误报告已准备就绪的通知（参见图 2）。 要分享错误报告，请点按该通知。 2.Android Emulator 菜单 在 Android Emulator 中，您可以使用“Extended controls”窗口中的 File a bug 功能： 点击模拟器面板中的 More 。 在 Extended controls 窗口中，选择左侧的 Bug report。 此时系统会打开一个屏幕，您可以在其中查看错误报告详细信息，例如屏幕截图、AVD 配置信息和错误报告日志。您还可以输入一条包含复制步骤的消息，以便与报告一起保存。 等待错误报告完成收集，然后点击 Save Report 。 3. adb bugreport 命令 如果您只连接了一台设备，则可以使用 adb 获取错误报告，如下所示： $ adb bugreport E:\Reports\MyBugReports

I've selected several of the trace tags and when I run the trace (from DDMS ) I get the following output: Unexpected error while collecting system trace. Unable to find trace start marker 'TRACE:': error opening /sys/kernel/debug/tracing/options/overwrite: No such file or directory (2) error openi (cuts off the error here) indeed there is no debug file in the kernel directory, but which mechanism will generate the necessary path? It looks like your cellphone is running a boot(kernel) image that does not support systrace. "error opening /sys/kernel/debug/tracing/options/overwrite: No such file

I am trying to run systrace on a non-rooted device. It always gives the following error if any of the trace events is selected: Unable to find trace start marker 'TRACE:': error opening /sys/kernel/debug/tracing/events/cpufreq_interactive/enable: No such file or directory If no trace event is selected, it works, but the trace is not very usweful. Does systrace requires root access? Note that I am running systrace directly from Eclipse (DDMS) on Windows-7. According to systrace.py --help , the following traces require root access: -d, --disk: trace disk I/O (requires root) -u, --bus-utilization