NAME
rtsched_numpri — number of priority values to support for POSIX.1b realtime applications
VALUES
Allowed Values
Any value in the range of 32 to 512
is allowed.
A value lower than 32 is reset to 32,
whereas a value higher than 512 is reset to 512.
DESCRIPTION
The
rtsched_numpri
tunable defines how many priority values to support for POSIX 1.b
realtime applications.
A larger value provides additional flexibility to applications in managing
relative priorities of all threads with respect to each other and
with respect to other applications running in the system.
However, a larger value adds processing overhead in the operating system
in terms of managing larger run queues with the possibility of
increased search times.
Who Is Expected to Change This Tunable?
Anyone.
Restrictions on Changing
Changes to this tunable take effect at next reboot.
When Should the Value of This Tunable Be Raised?
When the system is primarily running POSIX realtime applications, and
requires additional flexibility in managing relative priorities of
applications.
What Are the Side Effects of Raising the Value?
Raising the value of the
rtsched_numpri
tunable may cause some operating system overhead due to larger and
possibly more sparse run queues.
When Should the Value of This Tunable Be Lowered?
The default value of the
rtsched_numpri
tunable is already set to the minimum possible value.
What Other Tunable Values Should Be Changed at the Same Time?
None.
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 tunable values, consult the documentation
for the kernel software being installed.
For information about optional kernel software that was
factory installed on your system, see
HP-UX Release Notes
at
http://docs.hp.com.
AUTHOR
rtsched_numpri
was developed by HP.
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