stanford drupalcamp 2014 - a perfect launch, every time

A Perfect Launch, Every Time

Stanford DrupalCamp 2014

What is a perfect launch?• Schedule - On Time • Cost - On Budget • Scope - On Plan

Why should you care?

A Perfect Launch RecipeLaunch Team

• Onboarding Launch Check

• Best Practices Load Test

• Performance Tuning

Launch TeamOnboarding

How we prepare for launchGoal: Get rid of all the “uh-oh” moments Method: Launch Team Stakeholders:

• Project Manager - scheduling, best practices • Developer - platform knowledge, integration • Sys Admin - responsibilities, delegation • Business owner - flawless launch

Have a system and toolsSpecify common workflow requirements

• Repeatable tasks, delegatable Project management - Wrike, JIRA, Redmine Orientation logistics

• Scheduling - calendar, deadlines • Real-time communication

• Phone, Video Conference, GoToMeeting, IRC • Training - documentation, Slides, Videos

Mapping the terrainScoping of responsibilities

• Reduce confusion, set stage Channels of communication

• Define emergency procedures • Issue tracking as primary inbox

Staying in touch • Available, open, and regular • Proactive

Launch CheckBest Practices

What is Site Audit?Drupal 7 static analysis

• https://drupal.org/project/site_audit Best practices Actionable report Vendor agnostic

• Optional Pantheon specific recommendations

What can an audit analyze?• Drupal caching settings • Codebase and file size • Database structure • Modules, including duplicate / missing • Non-standard code structures • Views caching • Watchdog logs

Drupal caching settings

Drupal cron

Drupal’s database

Extensions (modules & themes)

Views

Watchdog

Test ConfigurationSimple Drupal 7 site Apache Bench

• 10,000 requests to home page (5 concurrent) Warmed cache, cleared watchdog Comparison

• Bad config, 1 PHP notice and warning in theme • Good config, no PHP notices or warnings

Result? Doubled performance.

Performance Comparison Bad Config Good Config

Load Time (min) 20:52 10:25

Requests per second 7.98 15.99

Time per request (ms) 626.192 312.780

Good configuration matters.

Load TestingPerformance Tuning

Why load test?Validate response times under peak load Smoke - operations under normal load Stress - behavior past peak load

• Spike - short bursts Capacity - plan for growth

Who should execute load tests?Developers execute Involve stakeholders

Tools for load testingDIY and simple

• Apache Bench - http://httpd.apache.org/docs/2.2/programs/ab.html

Complex / dynamic • Apache JMeter - https://jmeter.apache.org/ • Load Impact - https://loadimpact.com/ • Load Storm - http://loadstorm.com/

When should I load test?Baseline Tools

• Xdebug - http://xdebug.org/ • Webgrind - https://github.com/jokkedk/webgrind • Devel - https://drupal.org/project/devel • Syslog • Watchdog • New Relic - http://newrelic.com/

Incrementally during development

Where do I perform load tests?Live environment

• Bandwidth Resource limitations SaaS load testing solutions

What to expect during & after• Benchmark often

• Datapoints • Aggregate

• Be reasonable • Numbers should dictate expectations • Back-end

• Google Analytics

CachingOpcode Cache

• APC, Zend Opcache, eAccelerator Backends

• Memcached, Redis, MongoDB, file system, APC Front-end caching

• Varnish, Squid, reverse-proxy CDNs

Redis: Engage!

Anonymous page caching: Disabled!

Testing Varnish with cURL

PHP Slow Log

Nginx error log

MySQL slow log# Time: 130320 7:30:26 # User@Host: db_user[db_database] @ localhost [] # Query_time: 4.545309 Lock_time: 0.000069 Rows_sent: 219 Rows_examined: 254 SET timestamp=1363779026; SELECT option_name, option_value FROM wp_options WHERE autoload = 'yes';

Pay attention to watchdog6652 11/Oct 15:05 warning php Warning: Cannot modify header information - headers already sent by (output started at /srv/www/code/includes/common.inc:2700) in drupal_goto() (line !6643 11/Oct 14:21 notice php Notice: Trying to get property of non-object in cap_ui_preprocess_page() (line 27 of /srv/www/code/sites/all/themes/cap_ui/template.php). !6595 11/Oct 13:00 notice php Notice: Unknown: Can not authenticate to IMAP server: [AUTHENTICATIONFAILED] Invalid credentials (Failure) (errflg=2) in main() (line of ).

Good load test

Bad load test

Interpreting resultsHard numbers Business impact

A Perfect Launch, Every Time

Thank you! Questions?@getpantheon

irc.freenode.net #pantheon getpantheon.com