devtools_profile

CPU profiler.

CPU profiler. start/stop a sampling profile (.cpuprofile artifact, opens in DevTools Performance/JavaScript Profiler). stop and analyze return a bottom-up list of expensive functions (self time) and a call tree of hot paths.

Parameters

tabId · integer

Target tab id from browser_tabs, which lists tabs across all windows. Defaults to the agent’s most recently opened usable tab, or the only usable tab. Otherwise select a listed tabId.

action · enum · required

One of: start, stop, analyze, list.

samplingIntervalUs · integer

 

profileId · string

 

limit · integer

 

Example

{
  "tabId": 1234,
  "action": "start",
  "samplingIntervalUs": 500
}

{
  "tabId": 1234,
  "action": "stop",
  "limit": 20
}