Partition Names; Partition Numbers; Hyperthreading; Enabling Or Disabling Hyperthreading On Hp Superdome 2 Using The Gui - HP Integrity Superdome 2 16-socket Administrator's Manual

Partition names

Specifies the name of the nPartition. The parcreate —P name command is used to create an
nPartition with a name associated with it. An nPartition name must have at least one of the following
non-numeric characters: a-z, A-Z, dash (-), under-score (_), or period (.). An nPartition name with
the same format as the default name can only be specified if the specified name matches the nPar
number. If name is 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 with it. If -p number is not specified, an nPartition number
is automatically assigned to the created nPartition. Valid partition numbers range from 1 to 255.

Hyperthreading

Hyperthreading technology delivers thread-level parallelism on each processor core resulting in
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:
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 clear Enable Hyperthreading.
6. Click Apply.
Hyperthreading is enabled or disabled depending on whether you check or clear 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
Where, nParId can be either the nPar name or the nPar number.
NOTE: After hyperthreading is enabled for an nPartition, it is still necessary to configure the
operating system of that partition to use it. For HP-UX, this means changing the value of the kernel
parameter lcpu_attr to 1.

Socket Local Memory

On the HP Superdome 2 systems, memory controllers are associated with the processor sockets.
Locality-specific resources such as memory and CPUs, which were assignable as cell-specific
resources on legacy systems 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).
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