process_id_min.5 (2010 09)

process_id_min(5) process_id_min(5)

(Tunable Kernel Parameters)

It is recommended that validation of software be carried out with the largest conﬁgurable value

(1,073,741,567) for the

process_id_max

tunable, in conjunction with the process_id_min

tunable

set to something of the same magnitude (for example, 1,000,000,000).

The manpage for

process_id_max

(see process_id_max(5)) should be consulted for information about

potential application issues with large PID values.

Because session IDs (SIDs) and process group IDs (PGIDs) are the same as the process ID of the session

or group leader, an increase in the minimum PID also increases the minimum SID and PGID.

The system may assign process ID values less than

process_id_min to certain special system

processes.

Booting the system with

process_id_min

set to a non-zero value may cause the initialization process

(aka init) to have a PID of something other than 1. However, most system utilities and commands will,

by default, report the value of the initialization process’s PID as 1. For example,

getppid() returns 1 if

the caller’s parent is the initialization process, regardless of its actual PID.

Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parame-

ter values. After installation, some tunable parameters may no longer be at the default or recommended

values. For information about the effects of installation on tunable values, consult the documentation for

the kernel software being installed. For information about optional kernel software that was factory

installed on your system, see HP-UX Release Notes at

http://www.hp.com/go/hpux-core-docs

AUTHOR

process_id_min was developed by HP.