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Unit 1: Introduction to PHP

Notes
Set-up
I had compared two blog systems: this one and WordPress 2.5 with a patched WP-Cache-2
add on. I used following configuration:

1. Web Server lighttpd 1.4.13
2. Interface FastCGI
3. PHP 5.2

4. Bytecode cacher: XCache 1.2.1
5. Database MySQL 5.0
6. Caching for WP: WP-Cache-2 with an additional performance patch that caches
alreadydeflated versions of page in order to reduce requirement of re-compressing
on cache hit.

7. Hardware: AMD Athlon XP 64bit, 1G RAM
8. OS: Linux, Debian Etch 64bit.
I prepared two blogs that were filled up with 1000 articles each. Each article had 10
comments, all the articles were organized in 10 categories in each blog.
Tests
First I run load tests with disabled caching system.

Then the cache was enabled and cleaned before each test run. Each time, the cache was
“warmed up” with 100 requests of different pages. Then CMS was loaded by http_load
with 1000 requests from 5 concurrent connection. The client was patched in order to send
a header: Accept-Encoding: gzip, deflate in order to fetch compressed pages: the real live
situation.
For each run, the cache included a certain percent of new pages (in order to achieve a
correct hit/miss ratio) and the rest were taken from the 100 “warm pages”.
Results

CMS No cache fetches per second ratio Warm up time
WordPress: 7.6 13.0 s
CppCMS: 310 0.28 s

Miss ratio (%) WordPress CppCMS
0 711 2300
1 370 2160
3 176 1940
5 118 1790
10 64 1450
15 41 1210
20 33 1075
30 20 795
40 13 570
50 13 570
Contd...

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