ksi_alloc_max(5)ksi_alloc_max(5)NAMEksi_alloc_max - system-wide limit of queued signals that can be allo‐
cated
VALUES
Default
Allowed Values
Recommended
DESCRIPTION
is the system-wide limit on the number of queued signals that can be
allocated and in use. ksi stands for "kernel signal information" and
identifies entries with information about queued signals. There is one
per queued signal. Queued signals are used by the system call, timer
expiration, POSIX real time message queues, and asynchronous I/O. User
generated signals (via and are not queued.
Who Is Expected to Change This Tunable?
Anyone.
Restrictions on Changing
None. This tunable is dynamic.
When Should the Value of This Tunable Be Raised?
Frequent or heavy use of facilities which use queued signals, may
require raising this value. Since the default value is based on the
number of processes but the usage is thread based, a large number of
threads per process which use queued signals would require a raising
the tunable value. When is returned by applications using queued sig‐
nals, this tunable should be raised.
What Are the Side Effects of Raising the Value?
Increased memory usage, but only if used. Every allocated entry is 96
bytes.
When Should the Value of This Tunable Be Lowered?
Only to control the applications' usage of queued signals.
What Are the Side Effects of Lowering the Value?
If too low, applications using queued signals may fail.
What Other Tunable Values Should Be Changed at the Same Time?
to limit the number of queued signals per process. Since is per system
based and is per process based, the tunable should always be greater.
Note that the default value for is and for is
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 HP.
SEE ALSOkill(2), sigqueue(2), ksi_send_max(5).
Tunable Kernel Parameters ksi_alloc_max(5)