DevCommerce Conference 2016: Performance, anti-patterns e stacks pra desenvolver e-commerce, com cases reais

PREMATUREOPTIMIZATION

The Root of ALL Evil

@akitaonrails

@akitaonrails

Rubyconf Brasil 2016 – September 23 - 24

Rubyconf Brasil 2016 – September 23 - 24

September

23 - 24 @rubyconfbr

“Premature Optimization is the Root of All Evil”

- Don Knuth

SPA e-commerce

SPA e-commerce http://www.loja.com.br/#!/produtos/item-001

SPA e-commerce http://www.loja.com.br/#!/produtos/item-001

http://www.loja.com.br/?_escaped_fragment_=/produtos/item-001

High Level Numbers

Client #1

$ 4,000

$ 4,000 ($ 7 MI/yr revenue - 0.68%)

Client #2

$ 100,000+

$ 100,000+ ($ 800 MI/yr revenue - 0.15%)

• Minimum IT Cost:


• USD 1000 - Cloud Services



• USD 3000 - 1 Developer




• USD 4000 - 1 “Responsible” (Manager, Marketing, etc)





• Total: USD 8.000/month (USD 96.000/year)






• Minimum Business Requirement:







• Revenue: > USD 2 MI / year







• Revenue: > USD 2 MI / year

• IT Cost / Revenue ratio: < 5%

Increase Revenue >

Lower Costs

Open > Proprietary (prefer “Best of Breed”)

Cloud > On-Premise (Infrastructure/Platform as a Service)

SaaS > IaaS (avoid doing yourself)

SEO & SEM (should not be Astrology!)

• /do/you/have/friendly/urls?


• sitemap.xml?


• sitemap.xml?

• Proper HTTP 301 Redirections?


• sitemap.xml?


• Social Network buttons?


• sitemap.xml?



• Periodic ORIGINAL CONTENT publishing?


• sitemap.xml?




• No duplication duplication of content content?


• sitemap.xml?




• No duplication duplication of content content?

• THEN OK!

I.

II.

III.

IV.

V.

VI.

VII.

VIII.

IX.

X.

XI.

XII.

Codebase One codebase tracked in revision control, many deploys

Dependencies Explicitly declare and isolate dependencies

Config Store config in the environment

Backing services Treat backing services as attached resources

Build, release, run Strictly separate build and run stages

Processes Execute the app as one or more stateless processes

Port binding Export services via port binding

Concurrency Scale out via the process model

Disposability Maximize robustness with fast startup and graceful shutdown

Dev/prod parity Keep development, staging, and production as similar as possible

Logs Treat logs as event streams

Admin processes Run admin/management tasks as one-off processes

y = x * 320

y = x * 320

y = (x << 8) + (x << 6)

• NO Test Suite with below 70% coverage


• NO CodeClimate below 3.0 rating



• NO source code file with hundreds of LOC




• NO COPY AND PASTE EVERYWHERE!!!





• NO functions with more than 1 page down






• NO table with dozens of fields






• NO table with dozens of fields

• NO hours to clone, setup and deploy!!

Spree: 68k LOC 40k are Specs! (60%)

Magento2: 300k LOC 127k are Specs! (< 30%)

Maintainability

> Performance

PRIORITIES!

• SQL N+1 Queries

• SQL N+1 Queries

• Too much SQL

• SQL N+1 Queries

• Too much SQL

• Too much SQL LIKE instead of Elastic

• SQL N+1 Queries

• Too much SQL


• Lack of proper SQL indexes

• SQL N+1 Queries

• Too much SQL



• Too much unused code that was not removed

• SQL N+1 Queries

• Too much SQL




• No CDN or proper HTTP Cache invalidation headers

• SQL N+1 Queries

• Too much SQL




• No CDN or proper HTTP Cache invalidation headers

• Too much synchronous work that should be async jobs

No Metrics No Optimization

- Alan Kay

“Make it Work

- Alan Kay

“Make it Work Make it Correct

- Alan Kay

“Make it Work Make it Correct Make it Fast

- Alan Kay

“Make it Work Make it Correct Make it Fast Make it Cheap”

- Alan Kay

You != Unicorn (nor Facebook, Google, Amazon, etc)

275k Merchants $ 72 Mi - Q1 2016 Founded: 2004, with Rails pre-1.0

Rails works because it didn’t have Facebook,

Google or Microsoft

“Casa de Ferreiro, Espeto de FERRO!”

• Increase Revenue > Lower Costs


• “Best of Breed” Open Source



• SaaS > PaaS > IaaS > On-Premise




• SEO & SEM =~ Astrology





• Maintainability > Performance






• PRIORITIES!!






• PRIORITIES!!

• No Metrics, No Optimization






• PRIORITIES!!

• No Metrics, No Optimization

• You != Unicorn

PREMATURE OPTIMIZATION is the Root of all Evil

THANKS!www.codeminer42.com

@akitaonrails

http://www.codeminer42.com

Education

DevCommerce Conference 2016: Performance, anti-patterns e stacks pra desenvolver e-commerce, com cases reais