1.
Eugene Kovshilovsky
@mediatemple
* WordCamp Orange County 2016 *
Caching 101

2.
Hello.
Eugene Kovshilovsky
Director of Engineering at Media Temple
@ekovshilovsky
@mediatemple

3.
Agenda
• Caching Definition
• Caching Performance
• Caching Locations
• Plugins to Check Out
• Takeaways
• Q&A

4.
Agenda
• Caching Definition
• Caching Performance
• Caching Locations
• Plugins to Check Out
• Takeaways
• Q&A

5.
“A temporary storage space or
memory that allows fast access to
data”
Definition of caching

6.
Why does caching matter?
DB
WordPress
Web Server OpCachePHP
WordPress
Web Server
✔

7.
Agenda
• Caching Definition
• Caching Performance
• Caching Locations
• Plugins to Check Out
• Takeaways
• Q&A

8.
Hardware caching performance
RAM
SSD HDD -
Spinning
Disks
20 GB/s
4M IOPS
600 MB/s
300K IOPS
200 MB/s
100 IOPS

9.
Performance with multiple servers
Reverse
Proxy
Web App
Object
Cache
MySQLWeb App
DB
Cache
CDN Cache
Page
Cache
Local
Cache
Local
Cache

10.
Agenda
• Caching Definition
• Caching Performance
• Caching Locations
• Plugins to Check Out
• Takeaways
• Q&A

11.
Hosting environments
●Shared hosting
●Virtual Private Server hosting (VPS)
●Dedicated hosting

12.
Shared hosting
Load
Balancer
Web App
MySQL
Web App
NAS
(SSD)
Application
Server
Farm
File
Cache
FS Cache
FS Cache
DB
Cache

13.
Dedicated & VPS hosting
VPS Hosting
My VPS
VPS
RAM
...
Storage
(SSD?)
RAM
Storage
(SSD?)
Dedicated Hosting
File
Cache
File
Cache

14.
Case Study: Media Temple’s Enterprise WordPress
Reverse
Proxy
Web
App
Object
Cache
MySQLWeb
App DB
Cache
CDN Cache
Page
Cache
Op
Cache
Op
Cache
Redis or
Memcache
NGiNX,
Varnish or
ATS PHP-FPM
or Apache

15.
Content Delivery Network (CDN)

16.
Amazon S3 vs. CDN
Amazon S3
●Unlimited FTP server
●Low-cost file storage
in one specific
geographical region
CDN (Content Delivery Network)
●Proxies and caches web
data at edge locations as
close to users as possible

17.
Agenda
• Caching Definition
• Caching Performance
• Caching Locations
• Plugins to Check Out
• Takeaways
• Q&A

18.
Caching plugins to check out
• W3 Total Cache
• Redis Object Cache
• BatCache
• WP Super Cache

19.
W3 Total Cache
• All-in-one
• Compatibility check and configuration UI
• Page, database, and object cache via shared disk or
Memcache
• Drop-in: advanced-cache.php

20.
Redis Object Cache
• Object cache only
• Simple UI
• Object cache with Redis
• Not for shared hosting

21.
BatCache
• Object cache only
• No UI
• Object cache with Memcache
• Installation requires copying files
• Not for shared hosting

22.
WP Super Cache
• File-based page cache only
• Shared hosting or single server only
• Drop-in: advanced-cache.php

23.
Agenda
• Caching Definition
• Caching Performance
• Caching Locations
• Plugins to Check Out
• Takeaways
• Q&A

24.
• If you are WordPress plugin developer
→ Mimic multiple configuration scenarios.
• If you are a WordPress theme / WordPress
site developer
→ Stage your site and have someone test it.
Takeaways

25.
Agenda
• Caching Definition
• Caching Performance
• Caching Locations
• Plugins to Check Out
• Takeaways
• Q&A

26.
Q&A
@ekovshilovsky
@mediatemple
ekovshilovsky@mediatemple.net - mediatemple.net

27.
Thank you!
@ekovshilovsky
@mediatemple
ekovshilovsky@mediatemple.net - mediatemple.net