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Hello
This Slide Intentionally
      Left Blank
This One Too
Site Performance
from Pinto to Ferrari
                   Joseph Scott
       joseph@josephscott.org
         http://josephscott.org/
Find Me

http://josephscott.org/
joseph@josephscott.org
@josephscott
The Pinto
http://www.flickr.com/photos/autohistorian/4439476737/
http://www.flickr.com/photos/autohistorian/4439476737/
http://www.flickr.com/photos/thomashawk/2466245846/
http://www.flickr.com/photos/autohistorian/4439476737/
http://www.flickr.com/photos/autohistorian/4439476737/
http://www.flickr.com/photos/autohistorian/4439476737/
http://www.flickr.com/photos/autohistorian/4439476737/
http://www.flickr.com/photos/autohistorian/4439476737/
The Ferrari
Steve Souders
http://stevesouders.com/
2007
2009
Why Did I Choose This Topic?
I Want My Site To Be Faster
I Want My Site To Be Faster

        Less Like A Pinto
I Want My Site To Be Faster

     More Like A Ferrari
How Fast Is It Now?
How Fast Is It Now?

Tools For Measuring
   Site Performance
Tools

webpagetest.org
pagespeed.googlelabs.com
Firefox & Firebug
Chrome/Safari & Dev Tools
HttpWatch
Where To Start?
Where To Start?

http://www.webpagetest.org/
webpagetest.org


Test Location
Browser
Connection Speed
Video
Browsers


      IE 8 still most commonly
   used browser (26.5% / 28.5%)



http://gs.statcounter.com/#browser_version-na-monthly-201106-201108-bar
Connection Speed



 FIOS 20Mbps
http://www.webpagetest.org/result/110827_KZ_1EBDB/1/details/
Which Part?
The Initial Request

Get the source
 for the page
The Initial Request

Get the source
                      0.113 seconds
 for the page
The Initial Request

DNS Lookup: 5 ms
Initial Connection: 47 ms
Time to First Byte: 57 ms
Content Download: 4 ms
Bytes In (downloaded): 9.6 KB
Bytes Out (uploaded): 0.4 KB
Requests Per Page


November 2010: 69

August 2011: 76


http://www.stevesouders.com/blog/2011/08/17/http-archive-nine-months/
Thinking Clearly About
              Performance


http://carymillsap.blogspot.com/2010/02/thinking-
          clearly-about-performance.html
Average Lies
List A                    List B
0.924                     0.796
0.928                     0.798
0.954                     0.802
0.957                     0.823
0.961                     0.919
0.965                     0.977
0.972                     1.076
0.979                     1.216
0.987                     1.273
1.373                     1.320
         pg3, Exhibit 1
Aim For Consistent Performance
Know Your Limits

Calculate the theoretical best performance
               for your setup
Know Your Limits

Calculate the theoretical best performance
               for your setup


  What ever you actually end up with
       will be slower than that
Moving Up The Stack
The Stack




 Network
The Stack




Server Hardware

   Network
The Stack




Operating System

Server Hardware

    Network
The Stack


HTTP

       Operating System

       Server Hardware

           Network
The Stack


HTTP        PHP

       Operating System

       Server Hardware

           Network
The Stack


HTTP        PHP           MySQL

       Operating System

       Server Hardware

           Network
The Stack

          WordPress

HTTP        PHP           MySQL

       Operating System

       Server Hardware

           Network
The Stack

          WordPress

HTTP        PHP           MySQL

       Operating System

       Server Hardware

           Network
HTTP - The Web Server

Apache
  remove any modules you aren’t using
  turn off host name lookups
  turn off FollowSymLinks
  turn off .htaccess (if you can)
  turn on compression (mod_deflate)
  tweak MaxClients
HTTP - The Web Server

    Apache - mod_pagespeed

http://code.google.com/speed/page-speed/docs/module.html


  http://code.google.com/p/modpagespeed/
HTTP - The Web Server

Consider Alternatives


               Nginx
HTTP - The Web Server

    HTTP Compression

     Keep-alive support

Correctly Configured Caching
ETag Survey


HTTP/1.1 200 OK
ETag: "cd7ac991ff11"
ETag Survey

If-None-Match: "cd7ac991ff11"

HTTP/1.1 304 NOT MODIFIED
ETag Survey


ETags used by 136 of the top
      1,000 U.S. sites


 http://josephscott.org/archives/2011/09/etag-survey/
ETag Survey

Of the 136 sites using ETags:
  54 Worked Correctly (39.7%)
  11 Sort of Worked (8%)
  71 Broken/Useless (52.2%)
Understanding PHP
Understanding PHP

           Lifespan
.php



Read    Parse   Compile   Execute   Output
Understanding PHP

            Lifespan
.php



Read    Parse    Compile   Execute   Output


        Apache      /      mod_php
Understanding PHP
.php
           Lifespan
Read    Parse   Compile   Execute   Output


                FastCGI


                 Nginx
Reading




Open    Read     Close
Reading

Open            Read        Close


   Avoid   co$tly services like NFS
Parse

hello.php
            <?php
            echo "Hello, World!n"


Parse error: syntax error, unexpected $end,
expecting ',' or ';' in /tmp/hello.php on line 3
Tokens



              <?php echo
$tokens = token_get_all( '

  "Hello, World!";' );
foreach ( $tokens as $token ) {
    if ( is_array( $token ) ) {
        echo token_name( $token[0] ) . " ( {$token[2]} ) -
    {$token[1]}n";
    } else {
        echo "{$token}n";
    }
}
T_OPEN_TAG ( 1 ) - <?php
T_ECHO ( 1 ) - echo
T_WHITESPACE ( 1 ) -
T_CONSTANT_ENCAPSED_STRING ( 1 ) - "Hello,
  World!"
;
Compile
Branch analysis from position: 0
Return found
filename:     /tmp/hello.php
function name: (null)
number of ops: 3
compiled vars: none
line # op                              fetch         ext return operands
-------------------------------------------------------------------------------
   2 0 ECHO                                                       'Hello%2C+World%21%0A'
   3 1 RETURN                                                      1
        2* ZEND_HANDLE_EXCEPTION
Execute

Deceptively Simple Term

•Includes all sorts of activity
•Database / remote requests
Output


•PHP can buffer output
•Don’t forget about compression
Making PHP Faster
Making PHP Faster

.php



Read    Parse   Compile   Execute   Output
Making PHP Faster


.php



Read    APC
        Parse   Compile   Execute   Output
Making PHP Faster

.php



Read    APC
        Parse   Compile   Execute   Output




         opcode cache
PHP - opcode caching


              APC
requests per second - increased 4x
  time per request - decreased 4x
Use An Opcode Cache
              (APC)
Use An Opcode Cache
             (APC)!
APC == Free Money
APC == Free Money
PHP

use an opcode cache (APC)
use newer versions
don’t use on static files (unless you really need to)
consider output buffering
be careful with preg_* functions
profile your running code (Xdebug, VLD)
don’t re-invent native PHP functions, they are likely
faster than yours
The Stack

          WordPress

HTTP        PHP           MySQL

       Operating System

       Server Hardware

           Network
MySQL

use InnoDB table type (unless you have a
really good reason not to)
use the slow query log

use EXPLAIN on queries, learn
what the output means

double   triple check your indexes
learn about quirks
The Stack

          WordPress

HTTP        PHP           MySQL

       Operating System

       Server Hardware

           Network
Memcached

“Free & open source, high-performance,
distributed memory object caching
system”
  in memory only, won’t survive a reboot
  key/value data store


        http://memcached.org/
WordPress + Memcached

     Memcached Object Cache
       Persistent data store for WordPress objects
       Reduces the number of database queries



http://wordpress.org/extend/plugins/memcached/
I’m Batcache
WordPress + Memcached

   Batcache
      Persistent data store for rendered pages




http://wordpress.org/extend/plugins/batcache/
WordPress Caching - Alternatives

  WP Super Cache
    http://wordpress.org/extend/plugins/wp-super-cache/

  W3 Total Cache
    http://wordpress.org/extend/plugins/w3-total-cache/
But Wait, There’s More!
MySQL Replication

Master / Slave
  one way, asynchronous
  send writes to the master
  send reads to the slave
  supports multiple slaves, and chaining
WordPress + HyperDB

   Drop in replacement for default DB class
      distributed reads and writes
      partition data


http://wordpress.org/extend/plugins/hyperdb/
What Could This Look Like?
What Could This Look Like?



Net
         web & database
What Could This Look Like?



Net                db
         web
What Could This Look Like?


                   db
Net
         web


                memcached
What Could This Look Like?


                  db          db

Net
         web




               memcached   memcached
What Could This Look Like?


           web      db          db



  load     web
balancer



           web   memcached   memcached
Variations

slave just for backups
multiple data centers
task specific web servers
When Things Go Wrong
Hire an Amazing SysAdmin
Questions?
Find Me

http://josephscott.org/
joseph@josephscott.org
@josephscott

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