[root@web01 ~]# ps -Af | grep php-fpm
root      1511     1  0 Aug11 ?        00:00:00 php-fpm: master process (/etc/php-fpm.conf)
apache    1512  1511  0 Aug11 ?        00:00:00 php-fpm: pool www
apache    1513  1511  0 Aug11 ?        00:00:00 php-fpm: pool www
apache    1515  1511  0 Aug11 ?        00:00:00 php-fpm: pool www
apache    1516  1511  0 Aug11 ?        00:00:00 php-fpm: pool www
apache    1517  1511  0 Aug11 ?        00:00:00 php-fpm: pool www
root      1909  1870  0 Aug12 pts/1    00:00:00 grep php-fpm
[root@web01 ~]# kill -SIGUSR2 1511
[root@web01 ~]# ps -Af | grep php-fpm
root      1911     1  0 Aug12 ?        00:00:00 php-fpm: master process (/etc/php-fpm.conf)
apache    1912  1911  0 Aug12 ?        00:00:00 php-fpm: pool www
apache    1913  1911  0 Aug12 ?        00:00:00 php-fpm: pool www
apache    1914  1911  0 Aug12 ?        00:00:00 php-fpm: pool www
apache    1915  1911  0 Aug12 ?        00:00:00 php-fpm: pool www
apache    1916  1911  0 Aug12 ?        00:00:00 php-fpm: pool www
root      1918  1870  0 Aug12 pts/1    00:00:00 grep php-fpm
[root@web01 ~]# php -v
PHP 5.4.15 (cli) (built: May  9 2013 08:20:20)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies