This is not the newest or most powerful command in AIX, and I know it won't be news to many people, however I do believe its power and simplicity are overlooked and it can be a great way to visualise how services such as the SRC (System Resource Controller) damon actually work.
Consider this example:
# ps -T 1835256
PID TTY TIME CMD
1835256 - 0:00 srcmstr
1441898 - 0:00 |\--ksh
3473544 - 0:00 | \--tlmagent.bin
2752612 - 0:00 |\--cimssys
3276934 - 0:00 |\--cimssys
3670134 - 0:00 |\--snmpdv3ne
3866750 - 0:00 |\--sendmail
4456486 - 0:00 |\--pmserviced
4653200 - 0:00 |\--tftpd
5374142 - 0:00 | \--tftpd
4718738 - 0:00 |\--inetd
5898340 - 0:00 | \--bootpd
4849820 - 0:00 |\--xntpd
4980896 - 0:00 |\--snmpmibd
5177356 - 0:04 |\--rmcd
5308630 - 0:00 |\--portmap
5963950 - 0:00 |\--pnsd
6029524 - 0:00 |\--nimesis
6095064 - 0:00 |\--sshd
6225990 - 0:00 | |\--sshd
3801168 pts/1 0:00 | | \--ksh
9699392 pts/1 0:00 | | \--ps
9044072 - 0:02 | \--sshd
8454202 pts/0 0:01 | \--ksh
5439694 pts/0 0:00 | \--man
3932274 pts/0 0:00 | \--sh
9437218 pts/0 0:00 | \--more
6291580 - 0:00 |\--ksh
7340090 - 0:00 | \--ksh
4915214 - 0:23 | \--java
6815790 - 0:00 |\--qdaemon
1704024 - 0:00 | \--ksh
4325572 - 0:00 | \--piohpnpf
7405594 - 0:00 |\--IBM.HWCTRLRMd
7667732 - 0:00 |\--ksh
9175138 - 0:00 | \--nonstop_aix
7864320 - 0:39 | \--java
7733296 - 0:19 |\--java
7930002 - 0:00 |\--writesrv
8192066 - 0:00 |\--IBM.DRMd
8257564 - 0:00 |\--IBM.CSMAgentRMd
8388690 - 0:00 |\--hwsdagent
8519766 - 0:00 |\--aso
8650880 - 0:00 |\--IBM.AuditRMd
8781936 - 0:00 |\--lpd
8847384 - 0:00 |\--IBM.ServiceRMd
8912930 - 0:00 |\--IBM.DMSRMd
8978462 - 0:00 |\--pmloadcheck
9633962 - 0:00 \--syslogd
You can clearly see each of the active subsystems ans child processes such as shell or Java, and this can be very useful when trying to diagnose system performance issues. You can also extend this functionality by installing the pstree RPM:
# wget http://www.oss4aix.org/download/RPMS/pstree/pstree-2.36-1.aix5.1.ppc.rpm
# rpm -Uvh ./pstree-2.36-1.aix5.1.ppc.rpm
pstree ##################################################
pstree enables you to see everything that is running on your system, and how processes relate to each other, and this helps you to identify things that should not be running e.g.
# pstree
-+- 00001 root /etc/init
|--= 524354 root aioPpool
|--- 1376382 root [4]ldmp_process
|--- 1507478 root /usr/ccs/bin/shlap64
|--= 1638530 root [2]kbiod
|--= 1769576 root aioLpool
|--= 1900694 root /usr/lib/errdemon
|--- 2031730 root [17]/usr/sbin/syncd 60
|--= 2097274 root efs_tkr_gc
|--- 2424924 root ethchanproc
|--- 3014860 root random
|--= 3080408 root /opt/ibm/icc/cimom/bin/dirsnmpd
|--- 3145902 root /opt/ibm/director/cimom/bin/tier1slp
|-+= 3276968 root /usr/sbin/srcmstr
| |--= 2293910 root /usr/sbin/snmpmibd
| |--= 2555958 root /usr/sbin/portmap
| |--= 2818118 root /usr/sbin/xntpd
| |--= 3408008 root /usr/sbin/inetd
| |--= 3473518 root /usr/sbin/syslogd -r
| |--= 3604590 root sendmail: accepting connections
| |-+= 3932308 root [2]/usr/sbin/tftpd -n
| | \--= 3866836 nobody /usr/sbin/tftpd -n
| |--= 4063364 root /usr/sbin/aso
....
...
This machine is a NIM Master so I need tftpd to provide network boot images, otherwise this daemon should not be active!
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