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LEARN ABOUT HPUX

msgmni

msgmni(5)							File Formats Manual							 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 without removing it, the queue and all its  messages  remain.	 Abandoned
       message 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 section 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 immediately.

   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
       system 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 parameter 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 values.  For information about the effects of installation on tun-
       able values, 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)

UNIX for Advanced & Expert Users