Which process to monitor

for testing the BENCHMARK file
after I have setup the Qbox server and then the ftp server

i use the ps -ef | grep vsftpd_v1 to ge the list of processes

but it shows me 5 processes with the same name

root 12773 12417 0 10:31 pts/0 00:00:00 sudo ./vsftpd_v1 vsftpd.conf
root 12774 12773 0 10:31 pts/0 00:00:00 ./vsftpd_v1 vsftpd.conf
nobody 12786 12774 0 10:31 ? 00:00:00 ./vsftpd_v1 vsftpd.conf
crio-us+ 12790 12786 0 10:31 ? 00:00:00 ./vsftpd_v1 vsftpd.conf
crio-us+ 12918 12794 0 10:36 pts/1 00:00:00 grep --color=auto vsftpd_v1

which is the process that needs to be monitored??

please help I am stuck with this

Refer to hints here How to monitor changes in cpu and memory most are 0%?