HP Integrity Superdome 2 8/16 HP Superdome 2 Partitioning Administrator Guide - Page 23

Partition Numbers, Hyperthreading

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not specified either through the -p or -P options, a default name of the format nParnnnn is given to the nPartition (where nnnn is a 4 digit nPartition number). Partition Numbers Specifies the number of the nPartition. The parcreate -p number command is used to create an nPartition with a number associated to it. If -p number is not specified, an nPartition number is automatically assigned to the created nPartition. Valid partition numbers range from 1-255. Hyperthreading Hyperthreading technology delivers thread-level parallelism on each processor core resulting in more efficient use of processor resources-higher processing throughput and improved performance on multi-threaded software. Hyperthreading is enabled by default in an nPartition running on HP Superdome 2 servers. NOTE: Hyperthreading was not enabled by default on legacy systems. Enabling or Disabling Hyperthreading on HP Superdome 2 using the GUI To enable or disable hyperthreading on HP Superdome 2 using the GUI, complete the following steps: 1. Log into the OA GUI. 2. Select the nPartition in the System and Devices tab. 3. Click Modify nPartition. 4. Click Advanced Settings. 5. Check or uncheck the Enable Hyperthreading. 6. Click Apply. Hyperthreading is enabled or disabled depending on whether you check or uncheck the Enable Hyperthreading option. Enabling or Disabling Hyperthreading on HP Superdome 2 using the CLI To enable hyperthreading on HP Superdome 2, run the following command: parmodify -p -T y To disable hyperthreading on HP Superdome 2, run the following command: parmodify -p -T n nParId can either be the nPar name or the nPar number. NOTE: Once hyperthreading is enabled for an nPartition, it is still necessary to configure that partition's operating system to use it. For HP-UX, this means changing the value of the kernel parameter lcpu_attr to 1. Socket Local Memory On HP Superdome 2 systems, memory controllers are associated with the processor sockets. Locality specific resources like memory and CPUs, which were assignable as cell specific resources are now socket specific resources. Therefore, the locality specific memory in an HP Superdome 2 system is referred to as a Socket Local Memory (SLM) and the locality specific processor cores are referred to as Socket Local Processors (SLP). Socket Local Memory can be specified as a blade resource attribute during the nPartition creation. This is explained in detail under the "Blade Resource Attributes" section. nPartition Properties 23

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not specified either through the
-p
or
-P
options, a default name of the format
nParnnnn
is
given to the nPartition (where
nnnn
is a 4 digit nPartition number).
Partition Numbers
Specifies the number of the nPartition. The
parcreate
—
p number
command is used to create
an nPartition with a
number
associated to it. If
-p number
is not specified, an nPartition number
is automatically assigned to the created nPartition. Valid partition numbers range from 1-255.
Hyperthreading
Hyperthreading technology delivers thread-level parallelism on each processor core resulting
in more efficient use of processor resources—higher processing throughput and improved
performance on multi-threaded software. Hyperthreading is enabled by default in an nPartition
running on HP Superdome 2 servers.
NOTE:
Hyperthreading was not enabled by default on legacy systems.
Enabling or Disabling Hyperthreading on HP Superdome 2 using the GUI
To enable or disable hyperthreading on HP Superdome 2 using the GUI, complete the following
steps:
1.
Log into the OA GUI.
2.
Select the nPartition in the System and Devices tab.
3.
Click
Modify nPartition
.
4.
Click
Advanced Settings
.
5.
Check or uncheck the
Enable Hyperthreading
.
6.
Click
Apply
.
Hyperthreading is enabled or disabled depending on whether you check or uncheck the
Enable
Hyperthreading
option.
Enabling or Disabling Hyperthreading on HP Superdome 2 using the CLI
To enable hyperthreading on HP Superdome 2, run the following command:
parmodify -p <nParId> -T y
To disable hyperthreading on HP Superdome 2, run the following command:
parmodify -p <nParId> -T n
nParId
can either be the nPar name or the nPar number.
NOTE:
Once hyperthreading is enabled for an nPartition, it is still necessary to configure that
partition's operating system to use it. For HP-UX, this means changing the value of the kernel
parameter
lcpu_attr
to 1.
Socket Local Memory
On HP Superdome 2 systems, memory controllers are associated with the processor sockets.
Locality specific resources like memory and CPUs, which were assignable as cell specific resources
are now socket specific resources. Therefore, the locality specific memory in an HP Superdome
2 system is referred to as a Socket Local Memory (SLM) and the locality specific processor cores
are referred to as Socket Local Processors (SLP).
Socket Local Memory can be specified as a blade resource attribute during the nPartition creation.
This is explained in detail under the
“Blade Resource Attributes”
section.
nPartition Properties
23