Generate CPU profile for node

taskgroup-cpuprofiling.js

var fs = require('fs'), 
  profiler = require('v8-profiler');

function saveHeapSnapshot(fileName) {
  var buffer = '';
  var snapshot = profiler.takeSnapshot("test");
  snapshot.serialize(
    function iterator(data, length) {
      buffer += data;
    },function complete(){
      fs.writeFileSync(fileName, buffer)
    }
  );
}

function saveCpuProfile(outputPath, profile) {
  var profileJSON;
  profileJSON = JSON.stringify(profile);
  
  // lets us see the deopt reason in latest chrome
  profileJSON = profileJSON.replace(/"bailoutReason":/g, '"deoptReason":');
  
  fs.writeFileSync(outputPath, profileJSON);
}

var recordSamples = true; // generate flame data
profiler.startProfiling("taskgroup", recordSamples);

// code to profile
var TaskGroup = require("taskgroup").TaskGroup;
var testArray = Array(10000).join().split(',');
var grp = TaskGroup.create();

testArray.forEach(function(value, index) {
  grp.addTask(function() {
    // console.log("task"+index);
  }); 
});

grp.on("completed", function(){
  // saveSnapshot("completed.heapsnapshot"); // genereates heap snapshot
  var cpuProfile = profiler.stopProfiling("taskgroup");
  saveCpuProfile("complete.cpuprofile", cpuProfile);
  
  // clean up
  cpuProfile.delete()
  // profiler.deleteAllProfiles();
  // profiler.deleteAllSnapshots();
});

grp.run();