Memory usage

Several performance tools provide memory usage reports.

The reports of most interest are from the vmstat, ps, and svmon commands.

Memory usage determination with the vmstat command
The vmstat command summarizes the total active virtual memory used by all of the processes in the system, as well as the number of real-memory page frames on the free list.
Memory usage determination with the ps command
The ps command can also be used to monitor memory usage of individual processes.
The svmon command
The svmon command provides a more in-depth analysis of memory usage. It is more informative, but also more intrusive, than the vmstat and ps commands. The svmon command captures a snapshot of the current state of memory. However, it is not a true snapshot because it runs at the user level with interrupts enabled.
Correlation between the svmon and vmstat command outputs
There is a correlation between the svmon and vmstat outputs.
Correlation between the svmon command and ps command outputs
There are some relationships between the svmon command and ps command outputs.
Minimum memory requirement calculation
The minimum memory requirement of a program can be calculated easily.

Parent topic: Memory performance