Follow your code: Node tracing

Follow your code: Node/V8 tracing
Gireesh Punathil, 26th Aug 2016

Agenda
♨ Overview of Node/V8 Runtime environment
♨ Eclipse as a Node.js development platform
♨ Debug Server-side Javascript through Browser
♨ Overview of in-built tracing
♨ Top tracing options in Node/V8
Thursday, August 25, 2016EclipseSummit 2016, Bangalore Follow your code: Node / V8 tracing

Philosophy of event-driven programming
Traditional synchronous multi-threaded model Asynchronous event driven model
Source: http://bit.ly/2baQkwp

4
dns
file
net
timer
Hello event driven
world!
=> dnscb
127.0.0.1
=> fscb
Name: node …
=> netcb
<html> …
=> timercb
I am timed out
Anatomy of event loop

var a = 10
var b = ‘g’
var c = new Object()
res.on(‘data’, function(d) {
data += d
});
dynamic typing
async, event driven
born for the cloud
isomorphic
single threaded
Major features of Node.js

Eclipse for Node.js
 Node.js a first class citizen in Eclipse
 Nodeclipse is the Eclipse plugin for the Node.js
 Professional Node.js development made easy, productive
and a cool experience
 Syntax high-lighting, in-built semantic validation, live
debugging, Content assist and much more
 Active community support

Prepare Eclipse for Node.js
 Get the latest Node.js
 Get the latest Java
 Get the latest Eclipse
 In Eclipse install new software
 Switch to Node perspective

Debug Server side script in the browser
♨ Server side code can be very large
♨ Quite difficult to follow the control flow and logic
♨ console logging very inefficient, and bad practice
♨ Native debugging is even more complex
♨ At the same time, vetting critical for reliable production

Debug Server side script in the browser
♨ Install a debugger module
♨ Start the application in the debugger
♨ Get the debugger port, and access it in the Browser
♨ Start following the code!

Tracing the script
Purpose
Trace Javascript functions with input and output
Output
Syntax (Heavy profile)

Log APIs
Purpose
Collect all the V8 API calls emanating from the application
Output
Syntax

Log Script execution
Purpose
Collect all the script / function information as and when they are loaded
/ compiled / recompiled
Output
Syntax

Tracing Garbage Collection
Purpose
Trace load in the v8 heap and collection patterns
Output
Syntax
Scavenge collection
Mark-sweep collection

Tracing Call Sequence
Purpose
Trace the code flow path on uncaught exception scenarios
Output
Syntax

Tracing Compilation
Purpose
Trace optimize compilation decisions and their reasons
Output
Syntax

Tracing Compiled Code
Purpose
Trace the generated native code for the Javascript source
Output
Syntax

Selectively disable Compilation
Purpose
Identify and omit optimize compilation on problematic methods
Output
Syntax

Profile the application for Performance
♨ Manual profiling inefficient and impractical
♨ Adding time measurement cause further burden
♨ Native profilers do not provide Javascript insights
♨ Large applications often contain performance hideouts
♨ Precise performance measures is a hallmark qualifier for
software modules

Profile with v8 profiler, view with tick
♨ Run the code inside light-weight profiler
♨ Rename the generated log file to v8.log
♨ Install tick module
♨ Post-process the profile log
♨ Start analyzing the profile!

For further learning
♨ Learn Node.js: https://nodejs.org/en/docs/
♨ Learn Javascript: http://www.w3schools.com/js/
♨ Learn V8: https://developers.google.com/v8/intro
♨ Learn Nodeclipse: http://www.nodeclipse.org
♨ Chrome developer tools: https://developer.chrome.com/devtools

Follow your code: Node tracing

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