How to see results of console.profile()?

Question

According to Chrome Console API Reference and MDN Docs, using console.profile('label') to start profiling and later using console.endProfile() to end profiling, should result in a profile added to Profiles (has been since renamed to Performance) panel in Chrome.

This works for me in Firefox, but I don't get any profiles when I run my code in Chrome. Instead I get the warning:

DevTools: CPU profile parser is fixing 16 missing samples.

Am I missing something here or is this a bug in Chrome DevTools?

related: https://stackoverflow.com/questions/52104710/chrome-cpu-profile-parser-is-fixing-n-missing-samples — faintsignal, Oct 10 '18 at 16:34

score 49 · Answer 1 · answered Mar 27 '18 at 16:35

49

Turns out the profile goes into a different panel:

CPU profiles added to the JavaScript profiler panel. You can open it by clicking three dots menu (in the top right corner) ⋮-> More tools -> JavaScript Profiler.

answered Mar 27 '18 at 16:35

atavakoli

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score 6 · Answer 2 · answered Dec 26 '19 at 12:29

The profiling can be observed from below code part.

function profileTest(callback) {      
  let i = 0;
  let work = setInterval(function() {         
      if(i == 3) {
         callback();
         clearInterval(work);        
         return;     
      }
      console.log('Doing some work..');
      i = i + 1;
  }, 1000);     
}

console.profile("profileTest()");
profileTest(function(){
  console.profileEnd();
});

Note: setInterval is used for simulation purpose.

As @atavakoli have already answered, created profile can be seen in 'CPU PROFILES' part in 'Javascript Profiler' tab that can be opened from Developer Tools → Three dots → More tools. For example below screenshot shows the result profile of above code part.

See following link: https://developers.google.com/web/updates/2016/12/devtools-javascript-cpu-profile-migration

For the warning message, below question link can be referred.
Chrome: CPU profile parser is fixing n missing samples

How to see results of console.profile()?

2 Answers2