Topas is a useful graphical interface that will give you immediate information about system activity.
Topas Monitor for host: aix4prt EVENTS/QUEUES FILE/TTY Mon Apr 16 16:16:50 2001 Interval: 2 Cswitch 5984 Readch 4864 Syscall 15776 Writech 34280 Kernel 63.1 |################## | Reads 8 Rawin 0 User 36.8 |########## | Writes 2469 Ttyout 0 Wait 0.0 | | Forks 0 Igets 0 Idle 0.0 | | Execs 0 Namei 4 Runqueue 11.5 Dirblk 0 Network KBPS I-Pack O-Pack KB-In KB-Out Waitqueue 0.0 lo0 213.9 2154.2 2153.7 107.0 106.9 tr0 34.7 16.9 34.4 0.9 33.8 PAGING MEMORY Faults 3862 Real,MB 1023 Disk Busy% KBPS TPS KB-Read KB-Writ Steals 1580 % Comp 27.0 hdisk0 0.0 0.0 0.0 0.0 0.0 PgspIn 0 % Noncomp 73.9 PgspOut 0 % Client 0.5 Name PID CPU% PgSp Owner PageIn 0 java 16684 83.6 35.1 root PageOut 0 PAGING SPACE java 12192 12.7 86.2 root Sios 0 Size,MB 512 lrud 1032 2.7 0.0 root % Used 1.2 aixterm 19502 0.5 0.7 root NFS (calls/sec) % Free 98.7 topas 6908 0.5 0.8 root ServerV2 0 ksh 18148 0.0 0.7 root ClientV2 0 Press: gil 1806 0.0 0.0 root ServerV3 0 "h" for help