react-native: systrace doesn't include JS or native modules thread info

I’m using systrace via the process detailed in the documentation. In my trace results there is no useful JS thread or native modules thread info. This makes it more or less useless for profiling my app.

React native version:

System:
    OS: macOS 10.14.6
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
    Memory: 791.28 MB / 16.00 GB
    Shell: 3.2.57 - /bin/bash
  Binaries:
    Node: 8.11.3 - ~/.nvm/versions/node/v8.11.3/bin/node
    Yarn: 1.17.3 - ~/.yarn/bin/yarn
    npm: 6.10.1 - ~/.nvm/versions/node/v8.11.3/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  SDKs:
    iOS SDK:
      Platforms: iOS 12.4, macOS 10.14, tvOS 12.4, watchOS 5.3
  IDEs:
    Android Studio: 3.4 AI-183.5429.30.34.5452501
    Xcode: 10.3/10G8 - /usr/bin/xcodebuild
  npmPackages:
    @react-native-community/cli: ^2.9.0 => 2.9.0 
    react: 16.9.0 => 16.9.0 
    react-native: ^0.60.5 => 0.60.5 
  npmGlobalPackages:
    create-react-native-app: 2.0.2
    react-native-macos-cli: 2.0.1

Steps To Reproduce

Take a systrace profile per the documentation
Open profile and note that the JS and native modules threads don’t contain useful information like they do in the documentation example

Describe what you expected to happen: JS and native modules threads appear in the systrace as per the documentation. See the following screenshots of my trace – the JS and native modules information is missing. There is mqt_js and mqt_native_mod in the trace but they don’t contain any meaningful data like the documentation example. This trace definitely contains some heavy JS work but it appears like it isn’t recorded.

Snack, code example, screenshot, or link to a repository: Example trace: https://www.dropbox.com/s/n0ig26bctwq359k/trace.html?dl=0

About this issue

Original URL
State: closed
Created 5 years ago
Reactions: 13
Comments: 22 (1 by maintainers)

Most upvoted comments

This is still an issue 1 year later. As far as I can see there are no working profiling tools for react-native Android at the moment and haven’t been for a couple years. This is really painful for my team, we have customers reporting performance issues on Android but have no way to diagnose and solve them other than trial and error. Only chrome profiler appears to work but as we all know that doesn’t offer a picture of what’s really happening, only a somewhat relative measurement of perf against itself using v8 with debug mode caveats. @axe-fb can you offer any guidance about the state of performance profiling for RN Android?

+16

evelant on Aug 29, 2020

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community’s attention? This issue may be closed if no further activity occurs. You may also label this issue as a “Discussion” or add it to the “Backlog” and I will leave it open. Thank you for your contributions.

stale[bot] on Jun 20, 2020

This is still an issue on latest RN 0.61.5. Symptoms are exactly the same.

System:
    OS: macOS 10.15.3
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
    Memory: 133.43 MB / 16.00 GB
    Shell: 5.7.1 - /bin/zsh
  Binaries:
    Node: 12.10.0 - ~/.nvm/versions/node/v12.10.0/bin/node
    Yarn: 1.19.2 - ~/.yarn/bin/yarn
    npm: 6.13.7 - ~/dev/TaskHero/node_modules/.bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  SDKs:
    iOS SDK:
      Platforms: iOS 13.2, DriverKit 19.0, macOS 10.15, tvOS 13.2, watchOS 6.1
    Android SDK:
      Android NDK: 21.0.6113669
  IDEs:
    Android Studio: 3.5 AI-191.8026.42.35.6010548
    Xcode: 11.3.1/11C504 - /usr/bin/xcodebuild
  npmPackages:
    @react-native-community/cli: ^4.1.0 => 4.1.0
    react: 16.9.0 => 16.9.0
    react-native: github:AndrewMorsillo/react-native#0.61-stable-th-custom => 0.61.5

evelant on Feb 20, 2020

can confirm this still happens with Hermes on react 0.62

loopiezlol on Jun 23, 2020

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react-native-bot on Aug 19, 2019