Performance Tuning WebWizard

Brief Tutorial of the Basics

We assume you have nmon running ...

The first screen is the main screen which contains all the vital information about your running system. There are more details about Disk, Network and Top processes on other screens. To get to these just type the first letter and to return press the letter again.

The basic commands are:

d for disks
n for network
t for top proecesses
s for SMP CPU details
a for show more (all) of the previous selected screen
space-bar for refresh now
h for help
q for QUIT

In the latest version of nmon these can be displayed at the same time, if you enlarge your screen (assuming here you are usings a X-Terminal).

If you cannot see the details press the letter "a"

The first screen contains the bulk of the details and should be fairly obvious what each means. If you return to the previous page they are more details of the individual stats and what they mean.

The most important for performance tuning are:

Area Screen Look for ...
Memory Main This includes the real (physical RAM) and the virtual (paging space). Also there are paging statistics.
Disk Main and Disk Main has the hot disk but the disk screen includes all the disk and CDROM including read, write, %busy.
Network Network These include the data rate and packet rates on each network.
Processes Main and Top The main screen details scheduling between processes and the Top Processes screen the details of each process including CPU used, priority, memory size.

Area	Screen	Look for ...
Memory	Main	This includes the real (physical RAM) and the virtual (paging space). Also there are paging statistics.
Disk	Main and Disk	Main has the hot disk but the disk screen includes all the disk and CDROM including read, write, %busy.
Network	Network	These include the data rate and packet rates on each network.
Processes	Main and Top	The main screen details scheduling between processes and the Top Processes screen the details of each process including CPU used, priority, memory size.