Oh sorry, that was my fault. I thought you are using php-fpm.
If you are using fcgi than you could use
/usr/bin/spawn-fcgi -a 127.0.0.1 -p 9000 -u www-data -g www-data -f /usr/bin/php5-cgi -P /var/run/fastcgi-php.pid -C 6
The number after -C is the amount of children.