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if you are executing in shell, you can set the memory limit for your php by adding the parameter "-d"
$ php -d "memory_limit=128M"
Or you can add ini_set('memory_limit', '128M'); in the symfony command file for all your symfony tasks.
For your web apps it's best to set it in a .htaccess file.
php_value memory_limit 128M
This increases the memory limit of the php process to 128Mb.