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semvmx(5)							     semvmx(5)

NAME
       semvmx - maximum value of any single System V IPC semaphore

VALUES
   Failsafe
   Default
   Allowed values
DESCRIPTION
       The  tunable  specifies	the maximum value any given System V IPC sema‐
       phore can have.

       If an application attempt to exceed this	 limit,	 it  will  receive  an
       error from or from

       For more information about System V semaphores, refer to the section of
       the sema(5) manpage.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect at the next reboot.

       Note:  If the DynSysVSem optional product bundle is installed increases
       in  the tunable value take effect immediately; decreases in the tunable
       value take effect at the next reboot.

   When Should the Value of This Tunable Be Raised?
       If an application requires larger semaphore values.

   When Should the Value of This Tunable Be Lowered?
       If requirements for the single semaphore value  has  decreased,	or  if
       there  for limit protection on run-away applications which change sema‐
       phores.

   What Other Tunable Values Should Be Changed at the Same Time?
       All the System V semaphore tunables are interrelated and should not  be
       treated	as independent variables.  The tunables must be evaluated as a
       system to ensure they reflect the application requirements.  The	 sema‐
       phore tunables include and Consider changes to when changing

       Note:   If the DynSysVSem optional product bundle is installed then the
       and tunables are ignored and have no effect.

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
       semop(2),  semctl(2),   sema(5),	  semaem(5),   semmni(5),   semmns(5),
       semmnu(5), semmsl(5), semume(5), sysv_hash_locks(5).

			   Tunable Kernel Parameters		     semvmx(5)

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