msgseg(5) File Formats Manual msgseg(5)NAME
msgseg - number of System V IPC message segments in the system (OBSOLETE)
DESCRIPTION
The tunable is obsolete and has been removed.
This tunable specified the total number of "segments" of system-wide shared memory message storage space which is shared among all IPC mes-
sage queues. This tunable is replaced by the tunable msgmbs(5) (The maximum (in megabytes) kernel memory to be used for messages waiting
to be received.)
For more information about System V message queues, refer to the section of the mesg(5) manpage.
WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter has been obsoleted for HP-UX 11i Version 3 and forward.
AUTHOR
was developed by AT&T.
SEE ALSO msgsnd(2), mesg(5), msgmbs(5), msgmap(5), msgmax(5), msgmnb(5), msgmni(5), msgssz(5), msgtql(5).
OBSOLETE Tunable Kernel Parameters msgseg(5)
Check Out this Related Man Page
msgmni(5) File Formats Manual msgmni(5)NAME
msgmni - maximum number of system-wide System V IPC message queues (IDs) allowed
VALUES
Default
Failsafe
Allowed Values
DESCRIPTION
The tunable specifies the maximum number of system-wide System V IPC message queue identifiers (one per queue). Each message queue created
has an identifier (ID) and there is an upper limit of identifiers.
Applications use the system call to create new queues. If all IDs have been used, will return
If a process acquires a message queue, but the process terminates without removing it, the queue and all its messages remain. Abandoned
message queues can be removed with the command. Message queue status can be monitored using the command.
For more information about System V message queues, refer to the section 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 immediately.
When Should the Value of This Tunable Be Raised?
Raise this tunable when applications require more queues.
When Should the Value of This Tunable Be Lowered?
Lower this tunable when the requirement for queues has diminished.
What are the Side Effects of Lowering the Value?
Lowering the value increases the risk of application failure due to the inability to create more message queues. Lowering the tunable has
no effect on any active message queues, even if the new tunable value is less than the number of queues created in the system. However, no
new queues may be created until the number of active queues 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
system to ensure the tunables reflect the application requirements. The message tunables include and Specifically, and tunables may need
adjustment along with changes to the tunable.
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 ipcrm(1), ipcs(1), msgget(2), mesg(5), msgmnb(5), msgtql(5), msgmbs(5).
Tunable Kernel Parameters msgmni(5)