process_id_min man page on HP-UX

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process_id_min(5)					     process_id_min(5)

NAME
       process_id_min - specify a minimum value for process IDs (PIDs)

VALUES
   Failsafe
   Default
   Minimum
   Maximum
       must  be	 less than or equal to If the difference between and inclusive
       is less than is effectively limited to this difference.

DESCRIPTION
       The tunable specifies the minimum process ID (PID)  value  to  generate
       for  new	 processes.   It allows application developers to duplicate an
       environment where PID values are large for the purpose of software val‐
       idation.

       This tunable is primarily intended for development environments.

   Who is Expected to Change This Tunable?
       Anyone  interested  in  software	 program  validation in an environment
       where PIDs have large values.

   Restrictions on Changing
       Changes to the tunable are effective immediately.  However, any	exist‐
       ing processes and their PIDs are not changed.

       It  is  recommended  that  the system be rebooted after specifying this
       tunable so that all PIDs in the system will have values in the selected
       range.

   When Should the Value of This Tunable Be Raised?
       Raise this tunable to validate software for tolerance of large PID val‐
       ues in a development environment.

   What Are the Side Effects of Raising the Value?
       If the difference between and is less  than  the	 number	 of  processes
       allowed to exist simultaneously will be lower than the value of

   When Should the Value of This Tunable Be Lowered?
       Lower this tunable when the system is meant to be moved from a develop‐
       ment to a production environment.

   What Are the Side Effects of Lowering the Value?
       If the difference between and is less  than  the	 number	 of  processes
       allowed to exist simultaneously will be lower than the value of

   What Other Tunable Values Should Be Changed at the Same Time?
       It  may	be desirable to change The tunable should, ideally, be set for
       the maximum value when  validating  software  which  uses  PIDs.	  When
       changing	 it  is	 recommended that the system be rebooted to ensure all
       processes have PIDs within the desired range.

WARNINGS
       All HP-UX kernel tunable parameters are release specific.  This parame‐
       ter  may	 be  removed or have its meaning changed in future releases of
       HP-UX.

       The HP-UX kernel may silently round the selected values for and/or (for
       example,	 to  the  nearest  power of 2) in order to accommodate the PID
       generation algorithm.

       It is recommended that validation of software be carried out  with  the
       largest configurable value (1,073,741,567) for the tunable, in conjunc‐
       tion with the tunable set to something of the same magnitude (for exam‐
       ple, 1,000,000,000).

       The  manpage for (see process_id_max(5)) should be consulted for infor‐
       mation 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  to  certain  special
       system processes.

       Booting	the system with set to a non-zero value may cause the initial‐
       ization 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,
       returns 1 if the caller's parent is the initialization process, regard‐
       less of its actual PID.

       Installation of optional kernel software, from HP or other vendors, may
       cause  changes  to  tunable parameter values.  After installation, some
       tunable parameters may no longer be at the default or recommended  val‐
       ues.  For information about the effects of installation on tunable val‐
       ues, consult the documentation for the kernel software being installed.
       For  information	 about	optional  kernel  software  that  was  factory
       installed on your system, see at

AUTHOR
       was developed by HP.

SEE ALSO
       init(1M), fork(2), getppid(2), nproc(5), process_id_max(5).

       whitepaper, available on

			   Tunable Kernel Parameters	     process_id_min(5)
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