php.iniの
[eaccelerator]
zend_extension="/usr/local/lib/php/20020429/eaccelerator.so"
eaccelerator.shm_size = "20"
eaccelerator.cache_dir = "/tmp/eaccelerator"
eaccelerator.enable = "1"...
を1番下に動かしてみましたが、
PHP Warning: Unknown(): Unable to load dynamic library './session.so' - Cannot open "./session.so" in Unknown on line 0
PHP Warning: Unknown(): Unable to load dynamic library './mysql.so' - Cannot open "./mysql.so" in Unknown on line 0
PHP Warning: Unknown(): Unable to load dynamic library './session.so' - Cannot open "./session.so" in Unknown on line 0
PHP Warning: Unknown(): Unable to load dynamic library './mysql.so' - Cannot open "./mysql.so" in Unknown on line 0
[Wed Dec 21 11:56:50 2005] [notice] Apache/1.3.34 (Unix) AuthMySQL/2.20 PHP/4.3.11 configured -- resuming normal operations
[Wed Dec 21 11:56:50 2005] [notice] Accept mutex: flock (Default: flock)
とでました。。

オプティマイザーはeAcceleratorしか使ってません。