numa_sched_launch.5 (2011 03)

numa_sched_launch(5) numa_sched_launch(5)

(Tunable Kernel Parameters)

When Should the Value of This Tunable Be Changed to 0?

The value of numa_sched_launch

should be set to 0

to preserve the legacy process default launch pol-

icy even when the system is conﬁgured in LORA mode.

When Should the Value of This Tunable Be Changed to 1?

The value of

numa_sched_launch

should be set to 1 to improve the performance of multi-process

applications.

When Should the Value of This Tunable Be Changed to 2?

The value of

numa_sched_launch

should be set to 2

when a multi-process application is likely to see

improved performance even if the system is not conﬁgured for LORA mode.

When Should the Value of This Tunable Be Changed to 3?

The value of

numa_sched_launch

should be set to 3

when a multi-threaded application is likely to see

improved performance by keeping the threads densely packed in the LDOMs, 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 parame-

ter 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

numa_sched_launch

was developed by HP.