To react. Systrace does not show JS and Native Modules Thread

Question

I followed the guide for profiling Android UI performance

I run the following cmd: / usr / local / Cellar / android -sdk / 24.4.1_1 / platform-tools / systrace / systrace.py --time = 10 -o trace.html shred gfx view -a com.navigation.

I can get trace output. But Js and Native Modules threads are not available, as described in the manual.

Here is an example of a generated trace.

I tried to start tracing with dev = false, as described in the manual, and with dev = true, as indicated in this, but does not work

I am currently using version 0.28.0. I have not tried using systrace before in a project, so I don’t know if it ever worked.

Any ideas why this is not shown are greatly appreciated.

Answer 1

Add dalvik --no-fix-threads to your command.

Answer 2

com.navigation application using Js and Native Modules?

If you do not use these modules in your application, it will not appear on your system.

Please refer to the following link how to add the natvie and js module to the application. https://apimirror.com/react_native/native-modules-android

Answer 3

Verify that the name of your package specified in the -a parameter is correct. I had a similar problem, and I found that I did not list the package name at all, which did not allow my trace to show any useful information.

Answer 4

Have you tried using systrace from Device Monitor in Android Studio? There you have many tracking options:

To open trace in new versions of Chrome, you must include this script in trace.html:

 <script src="https://rawgit.com/MaxArt2501/object-observe/master/dist/object-observe.min.js"></script>