High Performance WordPress - WordCamp Jerusalem 2010

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Barry Abrahamson

Technology

High Performance
WordPress
WordCamp Jerusalem
September 5, 2010

About Me

Barry Abrahamson
Systems Wrangler, Automattic
http://barry.wordpress.com/contact-me/

WordPress.com

Launched in August 2005
~13.5 million sites and 16 million users today

WordPress.com

Launched in August 2005
~13.5 million sites and 16 million users today
Over 2 billion HTTP requests per day

WordPress.com

Launched in August 2005
~13.5 million sites and 16 million users today
Over 2 billion HTTP requests per day
Billions of MySQL queries per month

What is Performance?

Speed - Serve each request as quickly as possible

What is Performance?

Speed - Serve each request as quickly as possible
Scaling - Serve many concurrent requests

Speed
Server
Generating the content
Client

Speed
Server
Generating the content
Client
Downloading

Speed
Server
Generating the content
Client
Downloading
Parsing

Speed
Server
Generating the content
Client
Downloading
Parsing
Displaying

Client Side Performance
80%+ of the total load time

Client Side Performance
80%+ of the total load time
Tools

Client Side Performance
80%+ of the total load time
Tools
YSlow - http://developer.yahoo.com/yslow/

Client Side Performance
80%+ of the total load time
Tools
YSlow - http://developer.yahoo.com/yslow/
Page Speed - http://code.google.com/speed/
page-speed/

Client Side Performance

Reduce number of HTTP Requests

Client Side Performance

Reduce number of HTTP Requests
Compress (gzip)

Client Side Performance

Reduce number of HTTP Requests
Compress (gzip)
Optimize images (resize, pngcrush, jpegtran)

Server Side Performance

More important than client side performance

Server Side Performance

More important than client side performance
Tools aren’t as advanced / fancy as client tools

Server Side Performance
Possible problems

Server Side Performance
Possible problems
Slow database queries

Server Side Performance
Possible problems
Slow database queries
PHP (CPU)

Server Side Performance
Possible problems
Slow database queries
PHP (CPU)
Network

Server Side Performance
Possible problems
Slow database queries
PHP (CPU)
Network
Tools

Server Side Performance
Possible problems
Slow database queries
PHP (CPU)
Network
Tools
WordPress Plugins - Search for “debug”

Server Side Performance

Tools
MySQL Slow query log

Server Side Performance

Tools
MySQL Slow query log
http://www.maatkit.org/doc/mk-query-digest.html

Server Side Performance

Tools
MySQL Slow query log
http://www.maatkit.org/doc/mk-query-digest.html
Strace / lsof / gdb

Server Side Performance

Tools
MySQL Slow query log
http://www.maatkit.org/doc/mk-query-digest.html
Strace / lsof / gdb
Many times plugins are the culprit.

As a User

Make sure you are running the latest WordPress!

As a User

Make sure you are running the latest WordPress!
Constant performance improvements being made.
Many from things found on WordPress.com

As a User

Make sure you are running the latest WordPress!
Constant performance improvements being made.
Many from things found on WordPress.com
Show a reasonable number of posts per page. 10-25
seems to be good

As a Sysadmin

Opcode cache (APC)
Caching plugins (Batcache, WP super cache)

As a Sysadmin

Opcode cache (APC)
Caching plugins (Batcache, WP super cache)
Make sure you are running the latest PHP

As a Sysadmin

Opcode cache (APC)
Caching plugins (Batcache, WP super cache)
Make sure you are running the latest PHP
HipHop

As a Sysadmin

Opcode cache (APC)
Caching plugins (Batcache, WP super cache)
Make sure you are running the latest PHP
HipHop
Apache + mod_php < Nginx + php-fpm.

Real World Numbers

APC
Empty cache - 33.5 MB RAM

Real World Numbers

APC
Empty cache - 33.5 MB RAM
Primed cache - 6.2 MB RAM

Real World Numbers

APC
Empty cache - 33.5 MB RAM
Primed cache - 6.2 MB RAM
60% reduction in CPU utilization ( 2160 CPUs )

Real World Numbers

APC
Empty cache - 33.5 MB RAM
Primed cache - 6.2 MB RAM
60% reduction in CPU utilization ( 2160 CPUs )
PHP 5.3.3 10% CPU reduction ( 360 CPUs )

Real World Numbers

HipHop
40% faster ( http://huichen.org/en/2010/06/
wordpress-3-benchmark/ )

Real World Numbers

HipHop
40% faster ( http://huichen.org/en/2010/06/
wordpress-3-benchmark/ )
270% faster ( http://huichen.org/en/2010/06/
wordpress-3-benchmark-part-2/ )

Apache + mod_php

1 request requiring php

Using mod_php, php is
loaded for every request
even if not needed
Most scaling problems are
because of this

As a Developer

Only perform write operations when needed. Example
is ﬂushing rewrite rules on every page load

As a Developer

Only perform write operations when needed. Example
is ﬂushing rewrite rules on every page load
Use WordPress functions when possible.

WordPress.com

~ 1100 servers in 3 datacenters
~ 450 web servers (8 CPU cores)
~ 400 database servers (lots of SSDs)
~ 75 memcached servers (800GB of RAM)

Scaling Tips

Most things you do to scale WordPress apply to
any web app

Scaling Tips

Most things you do to scale WordPress apply to
any web app
If your bottleneck is the database, something is
wrong

Scaling Tips

Most things you do to scale WordPress apply to
any web app
If your bottleneck is the database, something is
wrong
Measure twice, cut once, measure again

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High Performance WordPress - WordCamp Jerusalem 2010

1. High Performance WordPress WordCamp Jerusalem September 5, 2010

2. About Me Barry Abrahamson Systems Wrangler, Automattic http://barry.wordpress.com/contact-me/

3. WordPress.com

4. WordPress.com Launched in August 2005

5. WordPress.com Launched in August 2005 ~13.5 million sites and 16 million users today

6. WordPress.com Launched in August 2005 ~13.5 million sites and 16 million users today Over 2 billion HTTP requests per day

7. WordPress.com Launched in August 2005 ~13.5 million sites and 16 million users today Over 2 billion HTTP requests per day Billions of MySQL queries per month

8. WordPress.com Launched in August 2005 ~13.5 million sites and 16 million users today Over 2 billion HTTP requests per day Billions of MySQL queries per month 500TB of bandwidth per week

9. What is Performance?

10. What is Performance? Speed - Serve each request as quickly as possible

11. What is Performance? Speed - Serve each request as quickly as possible Scaling - Serve many concurrent requests

12. Speed

13. Speed Server

14. Speed Server Generating the content

15. Speed Server Generating the content Client

16. Speed Server Generating the content Client Downloading

17. Speed Server Generating the content Client Downloading Parsing

18. Speed Server Generating the content Client Downloading Parsing Displaying

19. Speed Server Generating the content Client Downloading Parsing Displaying

20. Client Side Performance

21. Client Side Performance 80%+ of the total load time

22. Client Side Performance 80%+ of the total load time Tools

23. Client Side Performance 80%+ of the total load time Tools YSlow - http://developer.yahoo.com/yslow/

24. Client Side Performance 80%+ of the total load time Tools YSlow - http://developer.yahoo.com/yslow/ Page Speed - http://code.google.com/speed/ page-speed/

25. Client Side Performance

26. Client Side Performance Reduce number of HTTP Requests

27. Client Side Performance Reduce number of HTTP Requests Compress (gzip)

28. Client Side Performance Reduce number of HTTP Requests Compress (gzip) Optimize images (resize, pngcrush, jpegtran)

29. Server Side Performance

30. Server Side Performance More important than client side performance

31. Server Side Performance More important than client side performance Tools aren’t as advanced / fancy as client tools

32. Server Side Performance

33. Server Side Performance Possible problems

34. Server Side Performance Possible problems Slow database queries

35. Server Side Performance Possible problems Slow database queries PHP (CPU)

36. Server Side Performance Possible problems Slow database queries PHP (CPU) Network

37. Server Side Performance Possible problems Slow database queries PHP (CPU) Network Tools

38. Server Side Performance Possible problems Slow database queries PHP (CPU) Network Tools WordPress Plugins - Search for “debug”

39. WordPress.com Debug Tools

40.

41.

42. Server Side Performance

43. Server Side Performance Tools

44. Server Side Performance Tools MySQL Slow query log

45. Server Side Performance Tools MySQL Slow query log http://www.maatkit.org/doc/mk-query-digest.html

46. Server Side Performance Tools MySQL Slow query log http://www.maatkit.org/doc/mk-query-digest.html Strace / lsof / gdb

47. Server Side Performance Tools MySQL Slow query log http://www.maatkit.org/doc/mk-query-digest.html Strace / lsof / gdb Many times plugins are the culprit.

48. How can I improve performance?

49. As a User

50. As a User Make sure you are running the latest WordPress!

51. As a User Make sure you are running the latest WordPress! Constant performance improvements being made. Many from things found on WordPress.com

52. As a User Make sure you are running the latest WordPress! Constant performance improvements being made. Many from things found on WordPress.com Show a reasonable number of posts per page. 10-25 seems to be good

53. As a User Make sure you are running the latest WordPress! Constant performance improvements being made. Many from things found on WordPress.com Show a reasonable number of posts per page. 10-25 seems to be good Monitor site performance

54. As a Sysadmin

55. As a Sysadmin Opcode cache (APC)

56. As a Sysadmin Opcode cache (APC) Caching plugins (Batcache, WP super cache)

57. As a Sysadmin Opcode cache (APC) Caching plugins (Batcache, WP super cache) Make sure you are running the latest PHP

58. As a Sysadmin Opcode cache (APC) Caching plugins (Batcache, WP super cache) Make sure you are running the latest PHP HipHop

59. As a Sysadmin Opcode cache (APC) Caching plugins (Batcache, WP super cache) Make sure you are running the latest PHP HipHop Apache + mod_php < Nginx + php-fpm.

60. Real World Numbers

61. Real World Numbers APC

62. Real World Numbers APC Empty cache - 33.5 MB RAM

63. Real World Numbers APC Empty cache - 33.5 MB RAM Primed cache - 6.2 MB RAM

64. Real World Numbers APC Empty cache - 33.5 MB RAM Primed cache - 6.2 MB RAM 60% reduction in CPU utilization ( 2160 CPUs )

65. Real World Numbers APC Empty cache - 33.5 MB RAM Primed cache - 6.2 MB RAM 60% reduction in CPU utilization ( 2160 CPUs ) PHP 5.3.3 10% CPU reduction ( 360 CPUs )

66. Real World Numbers

67. Real World Numbers HipHop

68. Real World Numbers HipHop 40% faster ( http://huichen.org/en/2010/06/ wordpress-3-benchmark/ )

69. Real World Numbers HipHop 40% faster ( http://huichen.org/en/2010/06/ wordpress-3-benchmark/ ) 270% faster ( http://huichen.org/en/2010/06/ wordpress-3-benchmark-part-2/ )

70. Real World Numbers

71. Apache + mod_php 1 request requiring php Using mod_php, php is loaded for every request even if not needed Most scaling problems are because of this

72. As a Developer

73. As a Developer Only perform write operations when needed. Example is ﬂushing rewrite rules on every page load

74. As a Developer Only perform write operations when needed. Example is ﬂushing rewrite rules on every page load Use WordPress functions when possible.

75. WordPress.com

76. WordPress.com ~ 1100 servers in 3 datacenters ~ 450 web servers (8 CPU cores) ~ 400 database servers (lots of SSDs) ~ 75 memcached servers (800GB of RAM)

77. Scaling Tips

78. Scaling Tips Most things you do to scale WordPress apply to any web app

79. Scaling Tips Most things you do to scale WordPress apply to any web app If your bottleneck is the database, something is wrong

80. Scaling Tips Most things you do to scale WordPress apply to any web app If your bottleneck is the database, something is wrong Measure twice, cut once, measure again

81. Scaling Tips Most things you do to scale WordPress apply to any web app If your bottleneck is the database, something is wrong Measure twice, cut once, measure again Don’t optimize if you don’t need to

82. Questions?

Editor's Notes

Serving lots of viruses quickly is not the kind of performance we want!
Serving lots of viruses quickly is not the kind of performance we want!
Talk about most common scaling problem. Database connection errors.

High Performance WordPress - WordCamp Jerusalem 2010

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Editor's Notes