Caching strategy and apc

Caching Strategy & APC Vo Duy Tuan - CEO/Founder From the PHP developer view

$who_am_I?
My Name is Võ Duy Tuấn
PHP 5 Zend Certified Engineer
Interests: PHP, Social Network, Optimize Web
Works:
Reader.vn CEO/Founder
Trainer
Freelancer
Help customer Optimize & Speed up website

Caching Strategy 1

1.1. Web Caching Introduction

1.2. Cache Strategy
Heavy load page/module
HIT & MISS ratio.
Budget & Technology
AJAX
SEO friendly
Seperating to small tactics
Cache WHERE ?
Cache WHAT ?
Cache HOW LONG ?

1.2.1. Cache WHERE?

1.2.2. Cache WHAT?
File
Code
Query Result
Object
Array
String
Number
…

1.2.3. Cache HOW LONG?
Cache Clear Type:
Never Expired
Normal Expired
Force Expired
“ More time caching, less real time data.”

Which cache do you HATE most?

Alternative PHP Cache - APC 2

2.1. What is APC?
Free PHP Extension
PHP Opcode cache
Support User data cache
Run on SAME machine with PHP
NOT support multi servers

2.2. APC Installation
On linux:
pecl install apc
On Windows:
Download apc DLL file to PHP extension directory such as php_apc.dll

2.3. PHP.INI
extension=/home/path/to/apc.so
[apc]
apc.enabled = 1
apc.cache_by_default= 0
apc.shm_segments=1
apc.optimization=0
apc.shm_size= 128
apc.ttl= 7200
apc.user_ttl= 7200

phpinfo()

2.4. APC Monitor

2.5. APC Using

2.6. APC Tip
Opcode your web code only
Disable APC for PhpMyAdmin
<Directory "/mysite/public_html/"> ... php_admin_flag apc.cache_by_default On </Directory <Directory "/mysite/public_html/ phpmyadmin/ "> ... php_admin_flag apc.cache_by_default Off </Directory>

2.6. APC Tip..
Cache STRING is better than ARRAY
Long Time To Live better than Short
Case study:
Caching for Feed System:

BEFORE

ANALYSE

Short TTL make fragmentation

It’s time to query …
Thanks you!

Caching strategy and apc

by Võ Duy Tuấn

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