12-08-2008
System wide user thread limit. does that exists :?
Hi all,
Is there any system wide limit on number of user threads. I only find nkthread as a tunable parameter,apart from the `per process limit`.
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LEARN ABOUT HPUX
ksi_send_max
ksi_send_max(5) File Formats Manual ksi_send_max(5)
NAME
ksi_send_max - limit on number of queued signals per process
VALUES
Default
Allowed Values
DESCRIPTION
is the per process limit on the number of queued signals that can be posted by a sender and currently pending at receivers. The enforced
limit is per process sender based. ksi stands for "kernel signal information" and identifies entries with information about queued sig-
nals. 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
Changes to this tunable take effect at the next reboot.
When Should the Value of This Tunable Be Raised?
Frequent or heavy use of facilities which use queued signals, may require raising this value. When is returned by the system call, the
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, failure of applications using queued signals may fail.
What Other Tunable Values Should Be Changed at the Same Time?
to limit the number of queued signals system-wide. 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 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 HP.
SEE ALSO
kill(2), sigqueue(2), ksi_alloc_max(5).
Tunable Kernel Parameters ksi_send_max(5)