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msgmni(5)							     msgmni(5)

NAME
       msgmni  -  maximum  number  of  system-wide System V IPC message queues
       (IDs) allowed

VALUES
   Default
   Failsafe
   Allowed Values
DESCRIPTION
       The tunable specifies the maximum number of system-wide	System	V  IPC
       message	queue identifiers (one per queue).  Each message queue created
       has an identifier (ID) and there is an upper limit of identifiers.

       Applications use the system call to create new queues.  If all IDs have
       been used, will return

       If a process acquires a message queue, but the process terminates with‐
       out removing it, the queue and all its messages remain.	Abandoned mes‐
       sage  queues can be removed with the command.  Message queue status can
       be monitored using the command.

       For more information about System V message queues, refer to  the  sec‐
       tion of the mesg(5) manpage.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       This  tunable is dynamic.  Changes to to this tunable take effect imme‐
       diately.

   When Should the Value of This Tunable Be Raised?
       Raise this tunable when applications require more queues.

   When Should the Value of This Tunable Be Lowered?
       Lower this tunable when the requirement for queues has diminished.

   What are the Side Effects of Lowering the Value?
       Lowering the value increases the risk of application failure due to the
       inability  to  create more message queues.  Lowering the tunable has no
       effect on any active message queues, even if the new tunable  value  is
       less  than  the number of queues created in the system. However, no new
       queues may be created until the number of active queues falls below the
       setting of

   What Other Tunable Values Should Be Changed at the Same Time?
       All  the System V message queue tunables are interrelated and should be
       treated as independent variables.  The set must be evaluated as a  sys‐
       tem  to	ensure the tunables reflect the application requirements.  The
       message tunables	 include  and  Specifically,  and  tunables  may  need
       adjustment along with changes to the tunable.

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.

       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 AT&T.

SEE ALSO
       ipcrm(1), ipcs(1), msgget(2), mesg(5), msgmnb(5), msgtql(5), msgmbs(5).

			   Tunable Kernel Parameters		     msgmni(5)

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