Rasmus Lerdorf关于PHP5性能优化的talk

主题： Better Web Apps with PHP 5
作者： Rasmus Lerdorf
时间： Jan.18, 2007
地址：
http://talks.php.net/show/lca07

PHP创始人之一做的报告，要用Firefox才能看，IE还看不了


报告的线索是：怎样将一个只能实现17 fetches/sec的程序，通过优化达到1700 fetches/sec，性能提高了100倍，相当厉害，图文并茂，细细品味相信都会有收货！

测试环境：

Hardware：
1.8GHz AMD Athlon,
1GByte RAM  
3ware 7200rpm drives under
3ware 7500-4 RAID card
full-duplex 100MBit dedicated segment with no other traffic

Software:
Ubuntu Linux 2.6.15
Apache-1.3.34
PHP 5.1.3-dev
PostgreSQL 8.1

主题要点总结如下：

- disabling SSL in postgres
- turning on persistent connections in PHP's PDO
- switching to MySQL and using it's query caching
- disabling MySQL's internal prepare by using the PDO::ATTR_EMULATE_PREPARES attribute
- Using APC as an opcode cache to avoid repeated compiling
- Configuring APC to only use absolute paths, and setting apc.stat to 0 to avoid having to stat files
- Storing common variables in shared memory via APC
- Caching DB results via APC as well
- Removing unnecessary include files.


关于APC的要点有三条,不过国内关于APC的讨论不多见