HP-UX Reference (11i v2 07/12) - 1M System Administration Commands A-M (vol 3)

kmtune(1M) kmtune(1M)

Notes

Changing kernel parameters dynamically is a fairly new feature. Programs using pstat(2), getrlimit(2), or

sysconf(2) may have been written with the previously correct assumption that the returned values do not

vary while the system is running. The use of

kmtune to modify the running kernel may cause such pro-

grams to produce erroneous results or even abort.

Some dynamic kernel parameters can be raised dynamically, but cannot be lowered without rebuilding the

kernel and rebooting. See the manual pages for those parameters for details.

When dynamically lowering per-process limits, processes that exceed the new limit will be "grandfathered".

Such processes will retain the old limit. The old limit will also apply to any child processes they create

after the change. Some parameters have exceptions to this general policy; see the manual pages for those

parameters for details.

It is possible to put multiple

-s and

-r options on a single kmtune command. kmtune will try to make

all of the changes, in the order listed. If an error occurs with one of the changes, the state of the other

changes is not deﬁned.

RETURN VALUE

Upon completion,

kmtune returns with one of the following exit values:

0 Successful.

1 Changes have been made and will take effect at next boot.

2 An error occurred.

Results of query requests are sent to stdout. Error and warning messages are sent to stderr.

FILES

/var/adm/kc.log Log of all kernel conﬁguration changes