Premature optimisation: The Root of All Evil

PREMATURE
OPTIMIZATION
The Root of ALL Evil
@akitaonrails

Rubyconf Brasil 2016 – September 23 - 24

“Premature Optimization
is the Root of All Evil”
- Don Knuth

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

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

$ 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 << 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%)

• 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

“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

Premature optimisation: The Root of All Evil

Recommandé

Recommandé

Contenu connexe

Tendances

Tendances (18)

Similaire à Premature optimisation: The Root of All Evil

Similaire à Premature optimisation: The Root of All Evil (20)

Plus de Fabio Akita

Plus de Fabio Akita (20)

Dernier

Dernier (20)

Premature optimisation: The Root of All Evil