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msgmnb(5)							     msgmnb(5)

NAME
       msgmnb - maximum number of bytes on a single System V IPC message queue

VALUES
   Default
   Failsafe
   Allowed Values
DESCRIPTION
       The  tunable  specifies	the  maximum allowable total combined size, in
       bytes, of all messages queued in a single given System  V  IPC  message
       queue at any one time.

       If  a system call attempts to exceed the limit imposed by it will block
       (or return if was specified) until a caller of decreases the number  of
       bytes  in  the queue sufficiently such that the new message, along with
       other messages still on the queue, will fit within the limit.

       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 affect subsequent operations.

   When Should the Value of This Tunable Be Raised?
       Raise  this tunable if applications have a need to store more data on a
       single queue.

   When Should the Value of This Tunable Be Lowered?
       Lower this tunable when	applications  have  no	need  to  store	 large
       amounts of data on a single queue.

   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, when the tunable is changed,
       adjustments may also be needed to the and tunables.

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
       msgrcv(2), msgsnd(2), mesg(5), msgmni(5), msgtql(5), msgmbs(5).

			   Tunable Kernel Parameters		     msgmnb(5)

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