It even has a simulator, rmss, that allows one to try out different memory size configurations to see how it impacts performance. See 6.05 for the AIX Performance and Tuning Guide. Monitor can be used to display system statistics of various short time performance values.
Monitor program is available for anonymous ftp from -file.
The logfile can be specified as a strftime string and can be compressed. User counts for remote and inactive users, and average inactive time. System uptime is printed.