Blue Border

Faster on Rails

David PaluyMay 28, 2012

Me

Co-Founder, Startup.

Previously, Co-Founder AlgoTrading Startup

Working with Ruby, since 2007

dpaluy

dpaluy

davidpaluy

IsraelRb @LinkedIn

Agenda

Usability

Web Servers

Rack Web Servers

Back-end

Front-end

Note: Links

CNN Example

Source

WebPage Test by Google

Usability

DelayUser Reaction

0-100 msInstant

0-300 msFeels sluggish

100-1000msMachine is working...

1s +Mental context switch

10s +I'll come back later...

Source

Usability

DelayUser Reaction

0-100 msInstant

0-300 msFeels sluggish

100-1000msMachine is working...

1s +Mental context switch

We're here!!! (on average...)

10s +I'll come back later...

Source

Navigation Timing (W3C)

Source

Measuring Site Speed with Navigation Timing Ilya Grigorik

WebPageTest

NY Times - test

Best Practice:

Measure

Analyze

Optimize

Scaling Rails

View 21 ScreenCasts by Gregg Pollack

Web Servers

Process-Based ServerEvent-Based Server- In a process-based server, each simultaneous connection requires a thread which incurs significant overhead.- An asynchronous server is event-driven and handles requests in a single (or at least, very few) threads.

Web Servers: Apache vs Nginx

Source

Web Servers: Apache vs Nginx

Source

The main advantage of the asynchronous approach is scalability!

Rack Web Server

Source

Rack Web Server by

Source

Rack Web Server by

Source

Rack Web Server

Don't use Unicorn without NGINX!VS

Read more about Unicorn here

Unicorn sucks at:

3rd-party APIs

OpenID consumers

Reverse proxy implementations with editing/censoring

HTTP server push

Long polling

Reverse AJAX

Real-time upload processing

Rainbows! - Unicorn for sleepy apps and slow clients

Rainbows ThreadPool Application

Read more about Rainbows here and Github

Source

Back-End

HTTP Pipelining Communication

SPDY by Google

Allows client and server to compress request and response headers

Allows multiple, simultaneously multiplexed requests over a single connection

Allows the server to actively push resources to the client that it knows the client will need (e.g. JavaScript and CSS files)

SPDY on Rails by Roman Shterenzon

Databases

N+1 redundancy

Hot Standby - A method of redundancy in which the primary and secondary (i.e., backup) systems run simultaneously. The data is mirrored to the secondary server in real time so that both systems contain identical information.

Warm Standby - A method of redundancy in which the secondary (i.e., backup) system runs in the background of the primary system. Data is mirrored to the secondary server at regular intervals, which means that there are times when both servers do not contain the exact same data.

Cold Standby - A method of redundancy in which the secondary system is only called upon when the primary system fails. The system on cold standby receives scheduled data backups, but less frequently than a warm standby. Used for non-critical applications or in cases where data is changed infrequently.

Tidbits: Automatic Query Explains (Rails 3.2)

Log slow queries:

Console:

Source

Tidbits: Giant queries loading everything into memory

Source

Tidbits: Kill Long Running Requests

Tidbits: Favicons and 404 Errors

Avoid

Tidbits: Linux Server

ulimit -n

memcached -t x // x CPU cores

Monitor everything
(StatsD with Graphite, Munin, NewRelic, UnionStation)

Client Side

YSlow

PageSpeed by Google

HAML vs ERB (Source)

How to make your JavaScript Fast

Wish you Faster Browsing!

Scaling = replacing all components of a car while driving it at 100 mph (Mike Krieger, Instagram)

References

WebPage Test by Google

PageSpeed by Google

SPDY by Google

How to scale a Ruby Web Service

Scaling Instagram

Measuring Site Speed with Navigation Timing

Thank you!