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numa_sched_launch(5) File Formats Manual numa_sched_launch(5)NAME
numa_sched_launch - change process default launch policy
VALUES
Failsafe
Default
Allowed values
Recommended values
unless the application requires explicit different behavior.
DESCRIPTION
The dynamic tunable controls the default launch policy for newly created processes. The process launch policy controls the initial place-
ment of the child process at creation time. The scheduler can migrate threads from one locality domain (LDOM) to another to distribute
workload for better throughput and responsiveness. The default launch policy is applicable only to processes that have no explicit launch
policy, processor binding, or LDOM binding applied to them (see mpctl(2) for details).
There are three possible values of this tunable:
This value explicitly disables any change in the default launch policy for
processes irrespective of the system configuration. A newly created process will be placed using the legacy default launch
policy.
This is the default and recommended value.
HP-UX will autosense the right policy setting based on system configuration. This policy directs HP-UX to optimize the launch
policy for multi-process applications that share data. Such applications can get better performance when the applications are
packed together in the same LDOM. The policy will cause child processes created using to be placed in the same locality domain
as the parent process. Note that a different default launch policy may be used in the future with new system configurations
for improved application performance when this tunable is enabled.
Processes created using will be treated as if they are a new application and will continue to be launched using the legacy
default launch policy.
This value explicitly enables the new default launch policy for processes.
A process created using is placed in the same locality domain as its parent process irrespective of the system configuration.
Who Is Expected to Change This Tunable?
System administrators who prefer to explicitly control the default launch policy for applications even when LORA (Locality Optimized
Resource Alignment) mode is enabled (see numa_policy(5) for details).
Restrictions on Changing
The tunable changes take effect immediately. However, changes to this tunable will not affect processes that are already created. Such
processes will need to be stopped and restarted to be launched with a modified tunable setting.
When Should the Value of This Tunable Be Changed to 0?
The value of should be set to to preserve the legacy process default launch policy even when the system is configured in LORA mode.
When Should the Value of This Tunable Be Changed to 1?
The value of should be set to to improve the performance of multi-process applications.
When Should the Value of This Tunable Be Changed to 2?
The value of should be set to when a multi-process application is likely to see improved performance even if the system is not configured
for LORA mode.
What Are the Side Effects of Changing the Value?
The distribution of CPU utilization across the system will change. This situation can result in a change in performance. The change in
performance is highly dependent on the workload and the partition configuration.
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 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 fork(2), mpctl(2), vfork(2), numa_policy(5).
Tunable Kernel Parameters numa_sched_launch(5)