Todo / Roadmap

[lahmatiy]

Input formats

• Chromium Performance Profile
  • Extract additional events like compute styles, layout, compile code etc
• Edge Enhanced Performance Traces (.devtools)
• V8 log preprocessed with --preprocess
  • Scripts
  • Function state transitions
• Raw V8 log
• Support for Firefox/Safari profiles Postponed until done with V8

Integrations

• Integration with playwright (using context.tracing?)
• Integration with puppeteer (using page.tracing?)
• Viewer as PWA
• File Handling

API

• Marks (smth like performance.mark() / performance.measure())
• setSamplingInterval
• cpupro -- script.js ...params as an alternative to node --require cpupro script.js ...params

Data (capturing & processing)

• Fix total time computation
• Bring file:///path/... and /path/... to one form
• Exclude startProfiling/stopProfiling frames from the profile
• Attach RegExp location to a parent call frame
• Populate collected profile with code fragments This data can be obtained from V8 log

Viewer

• Switch between threads (for Chromium timeline profiles with multiple threads)
• Marks on timelines
• Flow view
• Tree with columns view
• Keyboard navigation in trees / tables
• Flame charts
• Example data
• Instructions how to capture profile file

[cmdcolin]

great work on this! can the app display webworker traces also? just an idea

[lahmatiy]

@cmdcolin I'm going to add a switching between threads for Chromium timeline profiles (added a point to "viewer" about it), since a webworker is a thread and timeline contains a separate profile for each of them. However, that's a complex task and I can't currently say for sure about ETA of this feature.

[eJayYoung]

will it support heap profile or gc trace as well，I really like this kind of rethink about XXX profile analysis