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Web Performance
Culture and Tools
at Etsy
Mike Brittain
Dir. of Engineering, Infrastructure
Etsy
Boston Web Performance Meetup
Aug 24, 2011
Overview
Etsy and Engineering
Make Performance
Matter
Tools and Process
Web Performance Culture and Tools at Etsy
http://qacreate.etsy.com
Monthly
Weather Report
$38 MM in sales
1.9 MM items sold


http://etsy.me/weather-report-june-2011
Monthly
Weather Report
990 MM page views



http://etsy.me/weather-report-june-2011
Engineering
Technologies
Linux, Apache, MySQL,
PHP, Memcache
Solr, Squid, Hadoop, Amazon S3, EC2, EMR
Ganglia, Cacti, Nagios, Graphite, Splunk, and
some of our own...
Engineering
Teams
90 Engineers
3-6 engineers
+ product developer and/or designer
Engineering
Continuous
Deployment
~40 releases per day
 inc. app code and config changes
1. Write code
2. Code review
3. Automated tests
1. Write code
2. Code review
3. Automated tests
4. Dev ⇾ QA ⇾ Pre-Prod ⇾ Prod
1. Write code
2. Code review
3. Automated tests
4. Dev ⇾ QA ⇾ Pre-Prod ⇾ Prod
5. Monitor!
6. Monitor!
7. Monitor!
Engineering
Data-Driven
Development
45,000+ metrics
50+ dashboards
Make
Performance
Matter
Have a story
Business Impact
Measure
“Our own years of testing have conclusively
 shown that when speed of a feature or
 product improves, usage, quite simply,
 goes up.”
                                   ~Google

Abundance of research from Google, Bing,
AOL, Amazon, Shopzilla, etc.
http://googleblog.blogspot.com/2009/12/this-week-in-search-121809.html
Business Impact
Measure
Bounce rate
Search conversion
Business Impact
Measure
Purchase funnel
Ad impressions, page views and
tracking discrepancies
Social, engagement
Operations
Site Stability
Measure perf for discrete pieces
of your infrastructure
Contention for shared resources like
database, memcache, solr, or even web
server processes
Morale
Happy Engineers
Getting to work
Where to
Start?
Focus your efforts where it makes
sense for your business
Getting to work
Where to
Optimize?
Tiers of service
SLAs
Getting to work
Focus
Beware of CTS:
Constant Tweaking Syndrome
Getting to work
Focus
Friends don’t let friends
tweak without graphing
Make
Performance
Matter
Have your story
Tools and
Process at
Etsy
Process
Etsy’s
Perf Team
Standardize patterns
Create tools and reports
Coordinate efforts
Process
Server-side
Performance
There is nothing worse
than a blank page or a spinning
thing-a-ma-jigger
Process
Server-side
Performance
95th Percentile
> 800 ms is a P2 bug
Process
Server-side
Performance
Tools
Logging
Perf-related data belongs in
your server logs
apache_note()
Tools
Logging
$timer_start = microtime(true);
 ...
$timer_diff = microtime(true) - $timer_start;


register_shutdown_function()

apache_note('php_microsec', $timer_diff);
Tools
Logging
LogFormat "%{True-Client-IP}i %l %u %t "%r"
%>s %b "%{Referer}i" "%{User-Agent}i"
%{etsy_user_id}n %{php_bytes}n %{php_microsec}n
%D" combined
Tools
Logging
LogFormat "%{True-Client-IP}i %l %u %t "%r"
%>s %b "%{Referer}i" "%{User-Agent}i"
%{etsy_user_id}n %{php_bytes}n %{php_microsec}n
%D" combined
Tools
Logging
LogFormat "%{True-Client-IP}i %l %u %t "%r"
%>s %b "%{Referer}i" "%{User-Agent}i"
%{etsy_user_id}n %{php_bytes}n %{php_microsec}n
%D" combined
Tools
Logging
web0060 66.249.71.110 - - [24/Aug/2011:04:16:52
+0000] "GET /listing/12189259/tropical-etched-
pair-of-lampwork-glass HTTP/1.1" 200 11034 "-"
"Mozilla/5.0 (compatible; Googlebot/2.1; +http://
www.google.com/bot.html)" - 13399576 505780
554876
Tools
Analyze
grep ... access.log | awk ...
grep "/listing/" access.log | 
awk '{sum=sum+$(NF-1)} END {print sum/NR}'

grep "/listing/" access.log | 
awk 'BEGIN {max=0} {if ($(NF-1)>max) max=$(NF-1)}
END {print max}'
Tools
Analyze
Tools
Analyze
1. Capture perf data in logs
  page gen., Boomerang, Gomez
2. Aggregate
  Splunk, Logster, StatsD
3. Record in Graphite
          http://graphite.wikidot.com
Tools
Analyze
Tools
Logster
1. Read new log entries every
   minute
2. Parse and aggregate useful
   numbers
3. Send to Graphite
          http://github.com/etsy
web0001   [04:28:54   2011]   [error] [client 10.101.x.x] Oh noooooo!
web0001   [04:28:54   2011]   [warning] [client 10.101.x.x] Gaaaaahhh!
web0001   [04:28:54   2011]   [error] [client 10.101.x.x] Help me, Rhonda.
web0001   [04:28:54   2011]   [error] [client 10.101.x.x] Oh noooooo!
web0001   [04:28:54   2011]   [error] [client 10.101.x.x] Gaaaaahhh!
web0001   [04:28:54   2011]   [error] [client 10.101.x.x] Heeeeeeellllllllllllllpp
web0001   [04:28:54   2011]   [error] [client 10.101.x.x] Gaaaaahhh!!!
web1101   [04:28:54   2011]   [error] [client 10.101.x.x] Gaaaaahhh!!!
web0201   [04:28:54   2011]   [error] [client 10.101.x.x] You've been eaten by a g
web0001   [04:28:54   2011]   [error] [client 10.101.x.x] Oh noooooo!
web0001   [04:28:54   2011]   [fatal] [client 10.101.x.x] Gaaaaahhh!
web0201   [04:28:54   2011]   [warning] [client 10.101.x.x] Gaaaaahhh!
web0034   [04:28:54   2011]   [warning] [client 10.101.x.x] Oh nooooooooooo
web0001   [04:28:54   2011]   [error] [client 10.101.x.x] Gaaaaahhh!!!
web1101   [04:28:54   2011]   [error] [client 10.101.x.x] Gaaaaahhh!!!
web0201   [04:28:54   2011]   [error] [client 10.101.x.x] You've been eaten by a g
web0055   [04:28:54   2011]   [fatal] [client 10.101.x.x] Gaaaaahhh!!!
web0002   [04:28:54   2011]   [warning] [client 10.101.x.x] Sky is falling.
web0089   [04:28:54   2011]   [error] [client 10.101.x.x] Gaaaaahhh!!!
web0020   [04:28:54   2011]   [error] [client 10.101.x.x] Sky is falling.
web1101   [04:28:54   2011]   [fatal] [client 10.101.x.x] Gaaaaahhh!
web0055   [04:28:54   2011]   [warning] [client 10.101.x.x] Gaaaaahhh!
web0001   [04:28:54   2011]   [warning] [client 10.101.x.x] Oh nooooooooooo
web0001   [04:28:54   2011]   [error] [client 10.101.x.x] Gaaaaahhh!!!
web0034   [04:28:54   2011]   [error] [client 10.101.x.x] Gaaaaahhh!!!
web0087   [04:28:54   2011]   [fatal] [client 10.101.x.x] Sky is falling.
web0002   [04:28:54   2011]   [error] [client 10.101.x.x] Oh noooooo!
web0201   [04:28:54   2011]   [fatal] [client 10.101.x.x] Gaaaaahhh!
web0077   [04:28:54   2011]   [warning] [client 10.101.x.x] Gaaaaahhh!
web0355   [04:28:54   2011]   [warning] [client 10.101.x.x] Oh nooooooooooo
web0052   [04:28:54   2011]   [error] [client 10.101.x.x] Gaaaaahhh!!!
web0001   [04:28:54   2011]   [error] [client 10.101.x.x] Gaaaaahhh!!!
web0089   [04:28:54   2011]   [error] [client 10.101.x.x] Gaaaaahhh!!!
web0020   [04:28:54   2011]   [error] [client 10.101.x.x] Sky is falling.
web1101   [04:28:54   2011]   [fatal] [client 10.101.x.x] Gaaaaahhh!
web0055   [04:28:54   2011]   [warning] [client 10.101.x.x] Gaaaaahhh!
web0001   [04:28:54   2011]   [warning] [client 10.101.x.x] Oh nooooooooooo
Fatals   Errors   Warnings
:)
Tools
StatsD
Collects metrics from your app
code and sticks them in Graphite
StatsD::increment("logins.success");
StatsD::timing("gearman.time", $msec);
Tools
StatsD
         90th pct


         average
         lower
:) :)
Tools
Perf Dashboard
Tools
I/O Profiler
Lightweight, inline profiling
Start and end times wrapped
around service calls
  databases, memcache, apc, etc.
Tools
I/O Profiler
Tools
I/O Profiler
Tools
Client-side
Testing
Gomez (API), Boomerang,
WebPagetest
Tools
ShowSlow
Tracks front-end best practices
Tools
ShowSlow
Internal instance
Automated testing
End-point for I/O Profiler
Trending on individual rules
           http://showslow.com
Other thoughts
YSlow &
Page Speed
Mind your development process
3rd-party content and ga.js
“Use a CDN”
Other thoughts
Device-Specific
Design
The mobile web is very much
about designing for performance
Screen size, pixel density, connection speed,
wi-fi vs. cellular, browser cache size, local
storage, connections per host, metered
pricing, etc.
Make
Performance
Matter
Have your story
Use tools and process
to focus your efforts
We are
Hiring
http://etsy.com/careers
Software Engineering positions available in
a number of teams, including Analytics,
Operations, Web Performance, Payments,
Core Platform, Front-End, Internal Apps,
Search, Security, and more...
Thank
You
Mike Brittain
mike@etsy.com
@mikebrittain
CodeAsCraft.etsy.com
github.com/etsy
graphite.wikidot.com
showslow.com

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