Eugene Kovshilovsky@mediatemple

* WordCamp Orange County 2016 *

Caching 101

Hello.Eugene KovshilovskyDirector of Engineering at Media Temple@ekovshilovsky@mediatemple

Agenda• Caching Definition

• Caching Performance• Caching Locations• Plugins to Check Out • Takeaways• Q&A

Agenda• Caching Definition

• Caching Performance• Caching Locations• Plugins to Check Out• Takeaways• Q&A

“A temporary storage space or memory that allows fast access

to data”

Definition of caching

Why does caching matter?

DB WordPress

Web Server

OpCachePHP

WordPress Web

Server ✔

Agenda• Caching Definition

• Caching Performance• Caching Locations• Plugins to Check Out• Takeaways• Q&A

Hardware caching performance

RAMSSD HDD -

Spinning Disks

20 GB/s4M IOPS

600 MB/s300K IOPS 200 MB/s

100 IOPS

Performance with multiple servers

Reverse

Proxy

Web App Object

Cache

MySQLWeb App

DB Cach

eCDN Cache

Page Cache

LocalCach

e

LocalCache

Agenda• Caching Definition

• Caching Performance• Caching Locations• Plugins to Check Out• Takeaways• Q&A

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

Shared hosting

Load Balanc

er

Web App

MySQLWeb App

NAS(SSD)

Application Server

Farm

FileCach

e

FS Cache

FS Cache

DB Cach

e

Dedicated & VPS hostingVPS Hosting

My VPS

VPS

RAM

...

Storage(SSD?)

RAM

Storage(SSD?)

Dedicated Hosting

FileCach

e

FileCach

e

Case Study: Media Temple’s Enterprise WordPress

Reverse Proxy

Web App

Object Cache

MySQL

Web App DB

CacheCDN Cache

Page Cach

e

Op Cach

e

Op Cache

Redis orMemcache

NGiNX,Varnish or

ATS PHP-FPM or

Apache

Content Delivery Network (CDN)

Amazon S3 vs. CDNAmazon 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

Agenda• Caching Definition

• Caching Performance• Caching Locations• Plugins to Check Out • Takeaways• Q&A

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

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

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

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

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

Agenda• Caching Definition

• Caching Performance• Caching Locations• Plugins to Check Out• Takeaways• Q&A

• 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

Agenda• Caching Definition

• Caching Performance• Caching Locations• Plugins to Check Out • Takeaways• Q&A

Q&A@ekovshilovsky@mediatemple

ekovshilovsky@mediatemple.net - mediatemple.net

Thank you!@ekovshilovsky@mediatemple

ekovshilovsky@mediatemple.net - mediatemple.net