The topas monitoring tool
The topas command is a performance monitoring tool that is ideal for broad spectrum performance analysis.The topas command requires the perfagent.tools fileset to be installed on the system. The topas command resides in /usr/bin and is part of the bos.perf.tools fileset that is obtained from the AIX base installable media.
topas [-d number_of_monitored_hot_disks]
[-h show help information]
[-m Use monochrome mode - no colors]
[-w number_of_monitored_hot_WLM classes]
[-P show full-screen Process Display]
[-L show full-screen Logical Partition display]
[-U username - show username owned processes with -P]
[-W show full-screen WLM Display]
Useful combinations of the topas command
- topas -i
Using the topas monitoring tool
The topas monitoring tool tracks many statistics, including memory usage and paging information. In Example below, you can see the output of the topas command.
Example : Using the topas monitoring tool
There are two parts of the paging statistics reported by topas. The first part is total paging statistics. This simply reports the total amount of paging available on the system and the percentages free and used. The second part provides a breakdown of the paging activity. The reported items and their meanings are listed below.
Reports the number of faults.
Reports the number of 4 KB pages of memory stolen by the Virtual
Memory Manager per second.
Reports the number of 4 KB pages read in from the paging space
Reports the number of 4 KB pages written to the paging space per
Reports the number of 4 KB pages read per second.
Reports the number of 4 KB pages written per second.
Reports the number of input/output requests per second issued by
the Virtual Memory Manager.
The memory statistics are listed below.
Shows the actual physical memory of the system in megabytes.
Reports real memory allocated to computational pages.
Reports real memory allocated to non-computational pages
Reports on the amount of memory that is currently used to cache
remotely mounted files.