HP Integrity Superdome 2 16-socket HP Superdome 2 Partitioning Administrator G - Page 21
Partition names, Hyperthreading, Enabling or disabling Hyperthreading on HP Superdome 2 using the GUI
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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 -T y To disable hyperthreading on HP Superdome 2, run the following command: parmodify -p -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). nPartition properties 21