php-fpm cpu usage problem

I don't have many visitors on my wordpress website but today I saw that my website is down and not loading . I logged in to my centos server and using top command I saw that php-fpm cpu usage was 100% and it was stucked on 100% . After I rebooted my server everything is back to normal but I don't want this to happen again since I have adwords ads and down time means wasting my budget . I believe that something is wrong with my php-fpm config . I'm using directadmin's default php-fpm config parameters . Can anyone help me tune my php-fpm config ? If you have better configs , would you send it to me ?

Thanks ,