Before ini_set:
Fatal error: Out of memory (allocated 6291456) (tried to allocate 733 bytes) in /home/sequoia/public_html/cakephp/cake/libs/inflector.php on line 391

After ini_set('memory_limit', '500MB');
Fatal error: Allowed memory size of 262144 bytes exhausted (tried to allocate 30720 bytes) in /home/sequoia/public_html/cakephp/cake/basics.php on line 533