semvmx(5)semvmx(5)NAMEsemvmx - 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 ALSOsemop(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)