Heavy Web Optimization

BACK-END<?php //from a PHP dev ?>

PHP Developer from Reader.vn, Picto.vn & more…Vo Duy Tuan

$who_am_I?

My Name is Võ Duy Tuấn PHP 5 Zend Certified Engineer Interests: PHP, Social Network, Optimize Web Works:

Thegioididong Reader.vn, Picto.vn CEO/Founder Trainer Freelancer Consultant

$table_of_content

Warm up: Some best practices Back-end Optimization De-normalization Asynchronous processing Caching Scalability

Warm up: Some best practices1

1.1. Smarty Trick

a. Prevent recompile .tpl file:$smarty = new Smarty();

$smarty->compile_check = false;

b. Compile all .tpl files:set_time_limit(1000); //do not interrupt

$smarty->compileAllTemplates('.tpl',true);

1.2. Pagination

From

To

1.2. Pagination – Why?

How do we make pagination feature?

mysql_query(‘SELECT COUNT(*) FROM tbl WHERE col LIKE “%word%”’)

> Get total record > Get toal page > Build page number list with a simple loop

mysql_query(‘SELECT * FROM tbl WHERE col LIKE “%word%” LIMIT 0,20’)

> Get data of current page (page 1, with 20 rows/page)

Do you have the answer ?

1.3. Get enough data from remote server

Send HEAD to detect 404 error from remote URL

Read first bytes of remote file to detect image type,width/height

Back-end Optimization2

2.1. Where is Back-end?

“80% of the end-user response time is spent on the front-end. Most of this time is tied up in downloading all the components in the page: images, stylesheets, scripts, Flash, etc. Reducing the number of components in turn reduces the number of HTTP requests required to render the page. This is the key to faster pages.”

2.2. Back-end Optimize Theory

Reduce disk In/Out Reduce complex/fuzzy Reduce budget

2.3. Debugging & Profiling

Nusphere Phped Debugger Xdebug top command Apache bench

2.3.1. Nusphere Phped Debugger

Installation:

Step 1: Install php extension

Step 2: Install DBGbar addon for Firefox or DBG

debugger on Chrome

Step 3: Update PHP.INI config

Restart your web server (if needed)

2.3.1. Nusphere Phped Debugger

2.3.2. Xdebug

Installation:

Step 1: Install php extension

Step 2: Update PHP.INI config

Restart your server (if needed)

2.3.2. Xdebug

PHP.INI

[xdebug]zend_extension_ts = C:\..\php_xdebug-2.1.0-5.2-vc6.dll

xdebug.profiler_output_dir = "C:\xdebug"

xdebug.profiler_output_name = "callgrind.%R.%t"

xdebug.profiler_enable = 0

xdebug.profiler_append=0

xdebug.profiler_enable_trigger = 1

xdebug.extended_info=1

Usage:http://example.com/index.php?XDEBUG_PROFILE

2.3.2. Xdebug

2.3.3. linux command top

2.3.4. Apache Bench

Somewhere in the dark…

De-normalization3

3.1. What is De-normalization?

Most of use live with Relational DB. What is normalization?

Database normalization is the process of organizing the fields and tables of a relational database to minimize redundancy and dependency .(Wiki)

What is De-normalization? Denormalization is the process of attempting to

optimise the read performance of a database by adding redundant data or by grouping data. (Wiki)

3.2. How to de-normalize?

Vertical Split. Pre-calculated value. Duplicate data.

3.2.1. Vertical Split

3.2.1. Vertical Split (cont.)

3.2.2. Pre-calculated value

3.2.3. Duplicate data

3.3. Data correctness

Normalization = Correctness Denormalization = Performance

Asynchronous processing4

4.1. Job queue

4.2. Job queue :: Gearman

http://gearman.org/

But….Apache can be a job queue,

4.3. Async Request

function backgroundHttpPost($url, $prm = ''){$p=parse_url($url);$fp = fsockopen($p['host'], isset($p['port'])?$p['port']:80, $en, $es, 30);

if (!$fp) return false;

else {$out = "POST ".$p['path']."?".$p['query']." HTTP/1.1\r\n";$out.= "Host: ".$p['host']."\r\n";$out.= "Content-Type: application/x-www-form-urlencoded\r\n";$out.= "Content-Length: ".strlen($prm)."\r\n";$out.= "Connection: Close\r\n\r\n";if ($prm != '') $out.= $prm;fwrite($fp, $out); fclose($fp);return true;

}}

Usage:$taskUrl = 'http://picto.vn/task/deletephoto';backgroundHttpPost($taskUrl, 'photoid=' . $myPhoto->id);

Caching5

5.1. What is caching?

5.2. What is APC?

Alternative PHP Cache – APC Free PHP Extension PHP Opcode cache Support User data cache Run on SAME machine with PHP NOT support multi servers

5.3. APC Monitor

5.4. APC Using

5.5. 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

BEFORE

ANALYSE

AFTER

Short TTL make fragmentation

Short TTL make fragmentation

Amazon Elastic Compute Cloud – Amazon EC2 + EBS Amazon Simple Storage Service – Amazon S3 Amazon Simple Email Service – Amazon SES

Cloud computing - AWS6

6.1. Amazon EC2

5

6.1. Amazon EC2 (cont.)

5

6.2. Amazon S3

5

6.2. Amazon S3 (cont.)

5

6.2. Amazon S3 (cont.)

5

6.3. Amazon SES

5 1,000,000 emails = $100 Support SMTP

6.3. Amazon SES (cont.)

5

6.4. Adapt to AWS for scalability

5 Local server (Web & RDBMS) + S3 EC2 (Web) + EBS (RDB) + S3 EC2 (Web) + EBS (local storage) + Amazon

RDS (RDB) + S3 EC2 (Web) + EBS (local storage) + EC2

(noSQL) + S3

…Can use with more Amazon Services

It’s time to query …

CONTACT

Fullname: Vo Duy Tuan

Email: tuanmaster2002@yahoo.com

Phone: 0938 916 902

Website: http://bloghoctap.com

Thank you!