Managing Systems and Workgroups: A Guide for HP-UX System Administrators

Administering a System: Managing Printers, Software, and Performance
Managing System Performance
Chapter 7736
Configurable Kernel Parameters
In some cases, you may be able to get the results you need by resetting
kernel parameters. For example, if a user frequently runs out of
processes (symptom no more processes), raising the value of maxuprc
might be the answer.
NOTE Tunable kernel parameters can be static or dynamic (not requiring a
system reboot or kernel rebuild). The list of dynamic tunables is
continually growing. To determine which tunables are dynamic on your
HP-UX 11i system, use the kmtune command (see the kmtune (1M)
manpage), or see the Kernel Configuration portion of SAM. In SAM’s
Configurable Parameters screen, administrators can tell at a glance
whether or not the value of a particular tunable can be changed without
a reboot.
As of HP-UX 11i v2, use the kctune command or the kcweb web
interface. See kctune (1M) and kcweb (1M).
SAM allows you to view and change kernel parameter settings. To view
or adjust parameters, select Kernel Configuration and then Configurable
Parameters
. Then select Help/Overview, scroll down to the link for
Configurable Kernel Parameters and select it; then scroll down till you find
the parameter you are interested in and select it. Another way to get
help on a single parameter is to select that parameter on the Configurable
Parameters
screen, then press the F1 function key.
For more information on dynamic tunables, see “Reconfiguring the
Kernel (Prior to HP-UX 11i Version 2)” on page 282 and the Dynamically
Tunable Kernel Parameters in HP-UX 11i whitepaper at
http://docs.hp.com.
CAUTION Make sure you read the help for all the parameters related to any
parameter you are considering changing. In the case of maxuprc, you
would need to read the help on nproc as well as maxuprc.
Other Performance Management Tools
Some of the tools that HP provides are: