Usage:

Record the profile:

  d8 --prof your-file.js
  

Then process the file (this resolves C++ symbols and produces a JSON file with the profile data):

  <v8-dir>/tools/linux-tick-processor --preprocess v8.log > v8.json
  

To view the profile, click the Choose file button above and choose the file in the dialog box.

For recording a profile from Chrome use:

    --no-sandbox --js-flags=--prof
  

If running on Android use also use --single-process:

    --single-process --no-sandbox --js-flags=--prof
  

If the profile is from Android pass the unstripped Chrome library to resolve C++ symbols when processing the file using linux-tick-processor.

  <v8-dir>/tools/linux-tick-processor --preprocess --apk-embedded-library=./out/Release/lib.unstripped/libchrome.so v8.log > v8.json
  

More detailed instructions for Android here: https://v8.dev/docs/profile-chromium#android

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