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[SDK 45] Using sampling profiler with Hermes not possible

See original GitHub issue

Summary

On SDK 45 there is seemingly no way to open the react-native developer menu so it is not possible to start the sampling profiler and use react-native profile-hermes to download and analyze profiles from devices.

AFAIK the hermes sampling profiler is the only possible way to profile JS performance actually running on a device.

Managed or bare workflow? If you have made manual changes inside of the `ios/` or `android/` directories in your project, the answer is bare!

managed

What platform(s) does this occur on?

Android

Package versions

"expo": "next",
"expo-dev-client": "~0.9.3",
"react-native": "0.68.1",

Environment

  expo-env-info 1.0.3 environment info:
    System:
      OS: macOS 12.3
      Shell: 3.3.1 - /opt/homebrew/bin/fish
    Binaries:
      Node: 16.14.2 - /opt/homebrew/opt/node@16/bin/node
      Yarn: 3.2.0 - /opt/homebrew/bin/yarn
      npm: 7.18.1 - /opt/homebrew/bin/npm
      Watchman: 2022.03.21.00 - /opt/homebrew/bin/watchman
    Managers:
      CocoaPods: 1.11.3 - /opt/homebrew/bin/pod
    SDKs:
      iOS SDK:
        Platforms: DriverKit 21.4, iOS 15.4, macOS 12.3, tvOS 15.4, watchOS 8.5
    IDEs:
      Android Studio: Bumblebee 2021.1.1 Patch 3 Bumblebee 2021.1.1 Patch 3
      Xcode: 13.3.1/13E500a - /usr/bin/xcodebuild
    npmGlobalPackages:
      eas-cli: 0.52.0
      expo-cli: 5.4.3
    Expo Workflow: managed

Reproducible demo

N/A, observe that there is no way to access the react-native developer menu to start the sampling profiler

Stacktrace (if a crash is involved)

No response

Issue Analytics

State:
Created a year ago
Comments:9 (4 by maintainers)

Top GitHub Comments

3reactions

evelantcommented, May 2, 2022

@Kudo it would also be nice if hermes profile transformer could be integrated into the expo CLI. Right now in order to use react-native profile-hermes (which automatically downloads and converts the latest sampling profiler trace from a device) in a managed project it’s necessary to create a dummy react-native project with the same package id and run it there.

1reaction

evelantcommented, Jun 7, 2022

@lukmccall just FYI that is not the same functionality – the debugger and the sampling profiler are different things. There is no way to profile performance with hermes other than the sampling profiler and the hermes profile transformer tool. It cannot be done with chrome devtools.

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