The document discusses optimizing WordPress for high performance. It provides recommendations for services installation including Nginx, PHP-FPM, APC, MySQL, and Memcached. It also gives configuration details for Nginx, PHP-FPM, APC, MySQL, and caching. Benchmarks show a significant performance increase when applying optimizations like APC caching. The presentation concludes by discussing scaling to larger implementations using load balancers, caching servers, and a master-slave database setup.

1. HIGH PERFORMANCE
WordPress
Iliya Polihronov
WordCamp San Francisco 2012
Saturday, August 4, 12

2. Iliya
Polihronov
Systems Wrangler
Automattic
polihronov.wordpress.com
slideshare.net/vnsavage
@vnsavage
Saturday, August 4, 12

3. WordPress.com
Numbers
‣ 115 million pageviews per day
‣ 2.6 billion requests per day
‣ over 200 plugins
‣ 500ms per page
Saturday, August 4, 12

4. Notable Users
Saturday, August 4, 12

5. Services Installation
Nginx wiki.nginx.org/Install
PHP-FPM Compile PHP with --enable-fpm
For Debian Squeeze
$ gpg --keyserver hkp://keys.gnupg.net --recv-keys E9C74FEEA2098A6E
$ gpg --keyserver hkp://keys.gnupg.net --recv-keys ABF5BD827BD9BF62
$ gpg -a --export E9C74FEEA2098A6E | apt-key add -
$ gpg -a --export ABF5BD827BD9BF62 | apt-key add -
$ echo 'deb http://nginx.org/packages/debian/ squeeze nginx' >> /etc/apt/sources.list
$ echo 'deb http://packages.dotdeb.org squeeze-php54 all' >> /etc/apt/sources.list
$ apt-get update
$ apt-get install nginx php5-cli php5-fpm php5-cgi php5-mysql php5-memcache
Saturday, August 4, 12

6. Services Installation
APC php.net/manual/en/apc.installation.php
MySQL percona.com/doc/percona-server/5.5/installation.html
Memcached memcached.org
For Debian Squeeze
$ gpg --keyserver hkp://keys.gnupg.net --recv-keys 1C4CBDCDCD2EFD2A
$ gpg -a --export CD2EFD2A | apt-key add -
$ echo ‘deb http://repo.percona.com/apt squeeze main’ >> /etc/apt/sources.list
$ apt-get update
$ apt-get install php5-apc memcached percona-server-server-5.5 percona-server-client-5.5
Saturday, August 4, 12

7. Nginx Configuration
/etc/nginx/nginx.conf
worker_processes 8;
worker_connections 2048;
keepalive_timeout 30;
gzip on;
gzip_types text/css text/javascript application/x-javascript application/json text/xml;
gzip_min_length 500;
gzip_comp_level 5;
location ~ .(css|js|jp(e)?g|gif|png|swf|ico)$ {
expires 1y;
}
fastcgi_buffer_size 32k;
fastcgi_buffers 256 4k;
/etc/init.d/nginx
ulimit -n 65536
Full configuration at polihronov.wordpress.com
Saturday, August 4, 12

8. PHP-FPM and APC
/etc/php5/fpm/pool.d/www.conf
pm = dynamic
pm.max_children = 40
pm.start_servers = 5
pm.min_spare_servers = 5
pm.max_spare_servers = 10
listen.backlog = 512
/etc/php5/conf.d/20-apc.ini
extension="apc.so"
apc.enabled = 1
apc.shm_size = 32M
/etc/php5/fpm/php.ini
output_buffering = 4096
Saturday, August 4, 12

9. MySQL Configuration
/etc/mysql/my.cnf
key_buffer = 256M
sort_buffer_size = 4M
read_buffer_size = 4M
innodb_buffer_pool_size = 256M
innodb_log_buffer_size = 8M
tmp_table_size = 32M
max_heap_table_size = 32M
table_cache = 128
thread_cache = 64
query_cache_type = 1
query_cache_limit = 1M
query_cache_size = 32M
InnoDB - for tables with lots of reads and writes
mysqlreport - inspect important MySQL status values
Saturday, August 4, 12

10. Optimizing your
WordPress Install
‣ Keep it up to date
‣ Avoid unnecessary plugins
‣ Avoid slow plugins
http://wordpress.org/extend/plugins/p3-profiler
Saturday, August 4, 12

11. Caching
Memcached Object Cache
http://wordpress.org/extend/plugins/memcached/
WP Super Cache
http://wordpress.org/extend/plugins/wp-super-cache/
‣ Custom permalinks, like /%year/%monthnum%/%postname%/
‣ Enable all the recommended settings
Saturday, August 4, 12

12. Benchmarks
Virtual machine on a laptop, using Apache Benchmark (ab):
Without APC
11.07 REQUESTS/SEC
With APC
48.39 REQUESTS/SEC
With APC and Caching
16,140.70 REQUESTS/SEC
Saturday, August 4, 12

13. At a Larger Scale
INTERNET
Load Balancers
Web Servers Caching Servers Web Servers
Memcached
Master-Slave MySQL
Saturday, August 4, 12

14. Questions?
HIGH PERFORMANCE
WordPress
Saturday, August 4, 12

15. Iliya
Polihronov
Systems Wrangler
Automattic
polihronov.wordpress.com
slideshare.net/vnsavage
@vnsavage
Saturday, August 4, 12