semmsl man page on HP-UX

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semmsl(5)							     semmsl(5)

NAME
       semmsl - maximum number of System V IPC semaphores per identifier

VALUES
   Failsafe
   Default
   Allowed values
DESCRIPTION
       The  tunable  specifies	the  maximum number of individual System V IPC
       semaphores per semaphore identifier (ID).

       If an application attempts to exceed this limit,	 it  will  receive  an
       error 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.

   When Should the Value of This Tunable Be Raised?
       If applications require a larger number of semaphores per ID.

   When Should the Value of This Tunable Be Lowered?
       If application requirements for semaphores  per	ID  has	 decreased  or
       there is a need to protect against ill-behaved applications.

   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 Specifically, a change in  the  tunable  may
       require a change in 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.

       Prior  to  HP-UX	 11i Version 1 the maximum number of semaphores per ID
       was an undocumented constant 2048 in the header file Typically applica‐
       tions do not depend upon this limitation.  For those that were compiled
       with the old constant, tunable values higher than 2048  will  generally
       not  be	a  problem.  However, tunable values lower than 2048 may cause
       other such applications to fail.	 These should be recoded to obtain the
       current value from pstat_getipc(2).

       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
       semget(2),   sema(5),   semaem(5),   semmns(5),	semmni(5),  semmnu(5),
       semume(5), semvmx(5), sysv_hash_locks(5).

			   Tunable Kernel Parameters		     semmsl(5)
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