msgmbs man page on HP-UX

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msgmbs(5)							     msgmbs(5)

NAME
       msgmbs  -  maximum  number  of  megabytes  for all System V IPC message
       queues

VALUES
   Default
   Failsafe
   Allowed Values
DESCRIPTION
       The tunable specifies the maximum allowable  total  combined  size,  in
       megabytes, of all System V IPC messages in the system 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
       queued message bytes 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 to to this tunable take effect imme‐
       diately.	 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
       system.

   What are the Side Effects of Raising the Value?
       Raising this value increases the total message data which may be queued
       at any point in time.  This can result in having	 to  block  less  fre‐
       quently.

       Since message queue headers are stored in kernel memory, that memory is
       unavailable for use by other system services.

   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 are the Side Effects of Lowering the Value?
       Lowering	 the  tunable value has no effect on any active messages, even
       if the new tunable value is less than the total number of message bytes
       currently  enqueued.   However, no new messages may be queued until the
       total number of bytes 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 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.

       System  resource	 limits	 (such as, memory) may limit the number and/or
       total size of queued messages.  These system limits may be  encountered
       before the limit values of the msgtql and msgmbs tunables.

       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), msgmnb(5).

			   Tunable Kernel Parameters		     msgmbs(5)
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