A295 nodejs-knowledge-accelerator

A295
Node.js – Knowledge Accelerator
Michael Dawson, IBM Runtime Technologies

© 2016 IBM Corporation 2
About Michael Dawson
Senior Software Developer @ IBM
IBM Runtime Technologies Node.js Technical Lead
Node.js collaborator and CTC member
Active in LTS, build, benchmarking , api
and post-mortem working groups
Contact me:
michael_dawson@ca.ibm.com
Twitter: @mhdawson1
https://www.linkedin.com/in/michael-dawson-6051282

Agenda
• Why Node.js ?
• Node.js deep dive
• Positioning versus Java
• Node.js community
• IBM involvement
TM

© 2016 IBM Corporation
• What is it ?
• Ecosystem
• Productivity
• Performance
Why Node.js ?
4

Why Node.js – What is it?
• JavaScript != Java
• Node.js = Server-side JavaScript
• Event-oriented
• Non-blocking
• Asynchronous

http://www.modulecounts.com/
• There is a module for that
• 300K modules
• #1 on module counts
• #1 on Github (#projects)
• #1 on StackOverflow(2015)
Why Node.js ? – Ecosystem
6

• Most used runtime in
Bluemix
TM
Why Node.js ? – Ecosystem
7

Why Node.js ? – Productivity
• Faster development less code
• PayPal - https://www.paypal-engineering.com/2013/11/22/node-js-at-paypal/
• Took 1/2 time with less people
• 33% fewer lines of code
• NextFlix- http://www.infoworld.com/article/2610110/javascript/paypal-and-netflix-cozy-up-
to-node-js.html
8

• Reuse of “isomorphic” code components
• Availability of JavaScript talent
• Developer satisfaction
9

Why Node.js ? – Performance
Event based: perfect fit for asynchronous non-blocking I/0
11

Why Node.js ? – Performance
Best suited for asynchronous workloads
-80
-60
-40
-20
0
20
40
-75 -60.5 -18
28
JSON Serialization
Single Query
Multiple Queries
Data Updates
%ageofJavaPerformance
More
Computation
More
I/O
12

Why Node.js ? - Performance
• Thousands of concurrent connections
• PayPal - https://www.paypal-engineering.com/2013/11/22/node-js-at-paypal/
• Double number of requests/sec
• Response times 35% lower
• Groupon – http://www.nearform.com/nodecrunch/node-js-becoming-go-technology-enterprise/
• Reduced page load times by 50%
13

• Key characteristics
• Components
• Programing model
• Event loop
• Native code
• Common use cases
Node.js – Deep Dive

• Small (linux.tar.xz)
• Download 8.2MB
• Uncompressed 35.5 MB
• Fast startup
• 40 ms
• Small footprint
• 16.5 MB
Node.js – Deep Dive – Key Characteristics
https://nodejs.org/en/download/
https://benchmarking.nodejs.org/

Node.js – Deep Dive - Components
V8 – Javascript
Engine
V8
JavaScript Engine Libuv
Other
Dependencies
ICU
Cares
Zlib
http_parser
…
Node Binding Layer
Operating System
Node Libraries
Modules (npm or local) + Application
OpenSSL
16

Node.js – Deep Dive - Programing Model
• Dynamic
• Functional
• Asynchronous
• Event Based
17

Node.js – Deep Dive - Programming Model
var http = require('http');
var server = http.createServer();
server.listen(8080);
server.on('request', function(request, response) {
response.writeHead(200, {"Content-Type": "text/plain"});
response.write("Hello World!n");
response.end();
});
server.on('connection', function(socket) {});
server.on('close', function() {});
server.on('connect', function(socket) {});
server.on('upgrade', function(request, socket, head) {});
server.on('clientError', function(exception, socket) {});
• Event Based

Node.js – Deep Dive – Event Loop
19© 2016 IBM Corporation

Node.js – Deep Dive – Native Code
https://nodejs.org/api/addons.html
#include <node.h>
void nativeMethod(const FunctionCallbackInfo<Value> & args) {
Isolate* is = args.GetIsolate();
args.GetReturnValue().Set(String::NewFromUtf8(is, “Hi from native”));
}
void init(Local<Object> exports) {
NODE_SET_METHOD(exports, “callNative”, nativeMethod);
}
NODE_MODULE(nativeModule, init);
20

Node.js – Deep Dive – Native Code
https://nodejs.org/api/addons.html
const nativeModule = require(‘./build/Release/nativeModule’);
console.log(nativeModule.callNative());
21

• Back-end API services
• Service oriented architectures (SOA)
• Microservice-based applications
• Generating/serving dynamic web page content
• SPA applications with bidirectional communication over
WebSockets and/or HTTP/2
• Agents and data collectors
• Small scripts
Node.js – Deep Dive – Use Cases
https://github.com/nodejs/benchmarking/blob/master/docs/use_cases.md

• Strengths and weaknesses
• Choosing the right language
• Hybrid applications
Node.js versus Java

• One thread (or process) per connection
• Each thread waits on a response
• Scalability determined by number of threads
• Each thread:
• Consumes memory
• Is relatively idle
• Concurrency determined by number of
depot workers
Node.js versus Java – Scaling with Java

• One thread multiplexes for multiple requests
• No waiting for a response
• Handles return from I/O when notified
• Scalability determined by:
• CPU Usage
• “Back end” responsiveness
• Concurrency determined by how fast the
food server can work
Node.js versus Java – Scaling with Node.js

Node.js versus Node.js – Tradeoff
-80
-60
-40
-20
0
20
40
-75 -60.5 -18
28
JSON Serialization
Single Query
Multiple Queries
Data Updates
%ageofJavaPerformance
More
Computation
More
I/O
26

• Higher performance for I/O
• Easier async programming
• Fullstack/isomorphic development
Node.js versus Java – Choosing the Right Language

• Higher processing performance
• Type safety for calculations
• Rich processing frameworks

• Highly performant, scalable rich web applications
• Highly performant, reliable transaction processing
• Self-contained micro-service components
+

Node.js versus Node.js – Hybrid applications

• History
• Foundation
• Day to Day
Node.js Community

• 2009 – written by Ryan Dhal
• Jan 2010 - npm
• Sep 2010 – Joyent sponsors Node.js
• June 2011 – Windows support
• 2012 – 2014 – Hand over to Isaac Schlueter, then Timothy J. Fontaine
• December 2014 – io.js fork
• June 2015 – Node.js Foundation
• Oct 2015 – Node.js 4.x unites io.js/node.js 0.12.x lines
• Oct 2016 – Node.js 6.x
Node.js Community - History

• Mission:
• Corporate members
• 8 platinum(including IBM), 19 Silver
• Individual members
Node.js Community - Foundation
https://nodejs.org/en/foundation/
The Node.js Foundation's mission is to enable widespread adoption and help accelerate development of
Node.js and other related modules through an open governance model that encourages participation, technical
contribution, and a framework for long term stewardship by an ecosystem invested in Node.js' success.

• TSC - Technical Steering Committee
• CTC – Core technical Committee
• Collaborators (~76)
• Working Groups (Build, LTS, Benchmarking, API etc.)
• Teams
Node.js Community – Day to Day
https://github.com/nodejs/TSC/
https://github.com/nodejs/node/
https://github.com/nodejs/node/blob/master/WORKING_GROUPS.md
https://github.com/orgs/nodejs/teams

• Development Model
• Node.js Community Involvement
• V8 Community Involvement
• Platform Availability
• Tooling
Node.js - IBM

• Leverage Open Source
• Develop in community
• Add support for IBM platforms
• Support internal teams and our customers
Node.js IBM – Development Model

• Leadership
• Founding member of Node.js Foundation (1 board member)
• 4 CTC/TSC members (+2 past members)
• Facilitating multiple working groups
Node.js IBM - Node.js Community Involvement

• Regular contributors
• Active in working groups
LTS, build, post-mortem, build, security, api, citgm, dev-policy,
benchmarking, internationalization
• 11 IBMr’s with commit rights
• including #2, #5, #15, #28, #39, #42, #46
• Driving support for platforms - Linux on PPC, AIX and
Linux on Z
Node.js IBM - Node.js Community Involvement

• Deep expertise at V8
• Developed ports to IBM Platforms
• Contribution back to official V8 repositories:
https://github.com/v8/v8
• PPC: V8 4.3 and later have full functional PPC implementation
• s390: V8 5.1 and later have full functional implementation
• ~10-15 commits per week to V8 to maintain PPC/zlinux port
• Port to z/OS in progress:
• https://github.com/ibmruntimes/v8z/tree/3.28-zos
Node.js IBM – V8 Community Involvement

Node.js IBM – Platform Availability
• IBM SDK for Node.js
– Shipping Node.js releases since 2013
– 0.10.x + 0.12.x + 4.x + 6.x
– Linux on x / p / z, AIX, Windows, Mac
– Working on support for z/OS
• Community

Node.js Long Term Support (LTS)
https://github.com/nodejs/lts
• Current Release
– every 6 months
– Semver major
• LTS release every
October
– Even semver majors
– 30 months of support

• Appmetrics
• Health Center
• NodeReport
• Core inspection - IDDE/LLNODE
• GCMV
Node.js IBM – Tooling

Node.js IBM – Appmetrics
https://www.npmjs.com/package/appmetrics

Node.js IBM – Tooling - Healthcenter
https://marketplace.eclipse.org/content/
ibm-monitoring-and-diagnostic-tools-
health-center
• Free download
• Node.js + Java

Node.js IBM – Tooling - NodeReport
NodeReport example - heap
out of memory error
NodeReport content:
● Event summary
● Node.js and OS versions
● JavaScript stack trace
● Native stack trace
● Heap and GC statistics
● Resource usage
● libuv handle summary
● Environment variables
● OS ulimit settings
https://github.com/nodejs/nodereport

• MDB/LLNODE/IDDE
• Working in community to
standardize
Node.js IBM – Tooling - Core Inspection

• Free download
• --trace_gc
• --trace_gc_nvp
• --trace_gc_verbose
• Node.js + Java
Node.js IBM – Tooling - GCMV
https://marketplace.eclipse.org/content/
ibm-monitoring-and-diagnostic-tools-
garbage-collection-and-memory-
visualizer-gcmv

Michael Dawson
Thank you very much.
IBM
Runtime Technologies
michael_dawson@ca.ibm.com

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