semaem(5) File Formats Manual semaem(5)
NAME
semaem - adjust-on-exit maximum value
VALUES
Failsafe
Default
Allowed values
or less than or equal to
DESCRIPTION
The tunable specifies maximum cumulative "undo" value for any one semaphore as changed any one single process. That is, a process is
allowed up to outstanding increments or decrements on a semaphore for which has been specified.
If an application attempts to exceed the 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.
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 tun-
able value take effect at the next reboot.
When Should the Value of This Tunable Be Raised?
When an application is expected to have large increments or decrements of a semaphore, or a large series of increments without intervening
decrements, or a large series of decrements without intervening increments, for which "undo" semantics are desired.
When Should the Value of This Tunable Be Lowered?
When applications no longer have the need for a raised value.
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 semaphore tunables include and Specifically, the and the values may need
adjustment together.
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 parameter 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 values. For information about the effects of installation on tun-
able values, 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), sema(5), semmni(5), semmns(5), semmnu(5), semmsl(5), semume(5), semvmx(5), sysv_hash_locks(5).
Tunable Kernel Parameters semaem(5)
