Profiling V8

Simple way to profile your javascript app

Go to V8 inspector

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• For serious V8 profiling, add '--prof' to V8 flags in 'Editor - Project Settings - Plugins - UnrealJS - V8 Flags' and restart engine. After shutting down JavascriptIsolate, 'isolate-*-v8.log' will be dumped in 'Engine/Binaries/Win64/...' folder.

1. clone v8
2. npm i -g http-server
3. cd v8/tools and http-server to launch simple web server
4. open http://localhost:8080/profviz/profviz.html

• Visit http://v8.googlecode.com/svn/trunk/tools/tick-processor.html, and feed '*-v8.log' to analyze.

• https://v8.googlecode.com/svn/branches/bleeding_edge/tools/profviz/profviz.html

const sessionName = 'SessionName'
JavascriptProfile.Start(sessionName)

<<< HEAVY WORK LOAD >>>

let profile = JavascriptProfile.Stop(sessionName)

profile.GetTopRootNode().GetFunctionName()

function traverse(node,visit) {
  visit(node)
  _.range(node.GetChildCount()).forEach(index =>
    traverse(node.GetChild(index))
  )
)

traverse(profile.GetTopRootNode(), node => console.log(node.GetFunctionName()))