lora.7 (2010 09)

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lora(7) lora(7)

NAME

lora - Locality-Optimized Resource Alignment (LORA) framework

DESCRIPTION

LORA, an acronym for Locality-Optimized Resource Alignment, is a framework for exploiting the locality

domains in HP Non-Uniform Memory Architecture (NUMA) servers to improve performance or to reduce

cost. On NUMA servers, a locality domain can consist of a related collection of processors, memory, and

peripheral resources. All processors in a given locality domain will have equal or close to equal latency to

any memory.

LORA consists of a set of conﬁguration rules, commands and tools to simplify the conﬁguration process,

and a new HP-UX kernel mode. The two HP-UX modes are called LORA mode and SMP (Symmetric

Multiprocessor) mode. SMP mode is characterized by balanced utilization of all system processing

resources, although the scheduler does account for system topology in processor scheduling decisions.

In LORA mode, HP-UX attempts to align the processing resources executing an application within the

minimal set of locality domains. This alignment results in improved application performance, or, alterna-

tively, comparable performance with fewer processing resources.

The use of LORA is recommended for and is generally beneﬁcial to all workloads that exhibit locality of

memory reference. The exception is technical applications that operate on extremely large data sets. The

use of LORA requires the installation of a set of patches documented in the HP-UX 11i Version 3 Sep-

tember 2009 Release Notes.

The

parconfig command can be used to establish server conﬁgurations that conform to the LORA

rules.

The

loratune command can be used to reestablish good resource alignment if it has been disrupted by

a major workload transition or platform reconﬁguration event.

The

numa_mode kernel tunable parameter can be used to control the HP-UX mode.

The

numa_policy kernel tunable parameter can be used to control the LORA memory allocation poli-

cies.

The

numa_sched_launch

kernel tunable parameter can be used to control the LORA process launch

policies.

The tuning recommendations for LORA are as follows:

(1) Leave the

numa_mode parameter at its default value of 0.

(2) Leave the

numa_policy parameter at its default value of 0.

(3) Leave the

numa_sched_launch

parameter at its default value of 1.

(4) Apply the Server-Tunables product from the Tune-N-Tools bundle.

AUTHOR

lora was developed by HP.

Summary of content (2 pages)

PAGE 1
lora(7) lora(7) NAME lora - Locality-Optimized Resource Alignment (LORA) framework DESCRIPTION LORA, an acronym for Locality-Optimized Resource Alignment, is a framework for exploiting the locality domains in HP Non-Uniform Memory Architecture (NUMA) servers to improve performance or to reduce cost. On NUMA servers, a locality domain can consist of a related collection of processors, memory, and peripheral resources.
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(Notes) A (Notes) lA 2 Hewlett-Packard Company −1− HP-UX 11i Version 3: September 2010