Using Node.js to improve the performance of Mobile apps and Mobile - PowerPoint PPT Presentation

Using Node.js to improve the performance of Mobile apps and Mobile web Tom Hughes-Croucher @sh 1 mmer

Scalable Server-Side Code with JavaScript Who is Tom? • Wrote W3C Standards • 10+ years in the web industry Node • Worked on projects for: Tesco, NASA, Walmart, MySpace, etc Up and Running • ~5 years at Yahoo! including .com • Node team at Joyent Tom Hughes-Croucher @sh 1 mmer

This is a talk about why cell phones suck. @sh 1 mmer

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Radio waves suck (at least compared to fibre or copper) @sh 1 mmer

http://developer.yahoo.com/blogs/ydn/posts/2009/10/a_engineers_gui/ @sh 1 mmer

Radio vs. buildings @sh 1 mmer

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Desktop Mobile http://www.webperformancetoday.com/2012/04/02/mobile-versus-desktop-latency/ @sh 1 mmer

Ookla/speedtest.net via http://www.slideshare.net/patrickmeenan/velocity-2012-taming-the-mobile-beast/22 @sh 1 mmer

Effect of latency on servers @sh 1 mmer

Shielding Frontends @sh 1 mmer

nginx haproxy web services frontends ATS / data varnish @sh 1 mmer

var client = net.connect(80, domain, function() { client.write("GET / HTTP/1.1\r\n"); t1 = (new Date()).getTime(); }); client.on('end', function() { t2 = (new Date()).getTime(); output.write(domain + ' ' + ((t2-t1)/1000) + 's\n'); }); @sh 1 mmer

Sample of Alexa 5000 macupdate.com 442.3 uzai.com 403.658 wired.jp 238.848 facilisimo.com 205.159 mycokerewards.com 202.757 rbc.cn 192.354 moviesmobile.net 183.157 stop55.com 145.927 dir.bg 137.982 carrefour.fr 112.789 sifyitest.com 111.171 @sh 1 mmer

Event-driven Frontends @sh 1 mmer

Client → Server Server → DB Computation Computation @sh 1 mmer

Not an event frontend @sh 1 mmer

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Server @sh 1 mmer

Request @sh 1 mmer

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Event-driven frontend @sh 1 mmer

Place-holder @sh 1 mmer

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Shared Work Resources @sh 1 mmer

Memory operations @sh 1 mmer

var x = "I am a string" ~1ns Running 1 instruction 2ns Data from l1 cpu cache 5ns Data from l2 cpu cache 80ns Data from ram @sh 1 mmer

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Mobile latency @sh 1 mmer

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100 Blue Whales Cat @sh 1 mmer

"They went from running 15 servers with 15 instances (virtual servers) on each physical machine, to just four instances that can handle double the traffic." http://venturebeat.com/2011/08/16/linkedin-node/ @sh 1 mmer

Not just simple applications @sh 1 mmer

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First page load vs. Client MVC @sh 1 mmer

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http://www.belshe.com/2010/05/24/more-bandwidth-doesnt-matter-much/ @sh 1 mmer

Bandwidth Latency Device capability @sh 1 mmer

Barfing data at 3G @sh 1 mmer