Add initial browser process startup benchmark

benchmark/browser-process-startup.coffee

@@ -0,0 +1,48 @@
+#!/usr/bin/env coffee
+
+{spawn, exec} = require 'child_process'
+os = require 'os'
+path = require 'path'
+_ = require 'underscore-plus'
+temp = require 'temp'
+
+directoryToOpen = temp.mkdirSync('browser-process-startup-')
+socketPath = path.join(os.tmpdir(), 'atom.sock')
+numberOfRuns = 10
+
+launchAtom = (callback) ->
+  cmd = 'atom'
+  args = ['--safe', '--new-window', '--foreground', directoryToOpen]
+  atomProcess = spawn(cmd, args)
+
+  output = ''
+  startupTimes = []
+
+  dataListener = (data) ->
+    output += data
+    if match = /App load time: (\d+)/.exec(output)
+      atomProcess.stderr.removeListener 'data', dataListener
+      atomProcess.kill()
+      exec 'pkill -9 Atom', ->
+        try
+          fs.unlinkSync(socketPath)
+
+        callback(parseInt(match[1]))
+
+  atomProcess.stderr.on 'data', dataListener
+
+startupTimes = []
+collector = (startupTime) ->
+  startupTimes.push(startupTime)
+  if startupTimes.length < numberOfRuns
+    launchAtom(collector)
+  else
+    maxTime = _.max(startupTimes)
+    minTime = _.min(startupTimes)
+    totalTime = startupTimes.reduce (previousValue=0, currentValue) -> previousValue + currentValue
+    console.log "Startup Runs: #{startupTimes.length}"
+    console.log "Max time: #{maxTime}ms"
+    console.log "Min time: #{minTime}ms"
+    console.log "Average time: #{Math.round(totalTime/startupTimes.length)}ms"
+
+launchAtom(collector)