[root@xxx ~]# ps -ef | grep ceilometer
ceilome+ 10939     1  0 16:14 ?        00:00:26 ceilometer-agent-notification: master process [/usr/bin/ceilometer-agent-notification --logfile /var/log/ceilometer/agent-notification.log --config-file /etc/ceilometer/ceilometer.conf --config-file /etc/ceilometer/ceilometer-extra.conf]
ceilome+ 10952 10939  9 16:14 ?        00:06:40 ceilometer-agent-notification: NotificationService worker(0)
ceilome+ 10953 10939 10 16:14 ?        00:06:48 ceilometer-agent-notification: NotificationService worker(1)
ceilome+ 10954 10939 10 16:14 ?        00:06:44 ceilometer-agent-notification: NotificationService worker(2)
ceilome+ 10955 10939 10 16:14 ?        00:06:54 ceilometer-agent-notification: NotificationService worker(3)
root     17581 31409  0 17:21 pts/1    00:00:00 grep --color=auto ceilometer
[root@xxx ~]# ps -T -p 10952 10953 10954 10955 | wc -l
3487
[root@xxx ~]# ps -T -p 10952 10953 10954 10955 | wc -l
3488
[root@xxx ~]# ps -T -p 10952 10953 10954 10955 | wc -l
3493