AIX

smtctl

Détails
Catégorie parente: AIX
Catégorie : Les commandes
Affichages : 278

La commande 'smtctl' permet de savoir si la machine est en mode SMT ou pas.

Pour activer ou désactiver cette option, utiliser également la commande 'smtctl' avec l'option '-m' et 'on' ou 'off'

 

smtctl Command

Purpose

The smtctl command controls the enabling and disabling of processor simultaneous multithreading mode.

Syntax

smtctl [ -m off | on [ -w boot | now ]]

smtctl [ -t #SMT [ -w boot | now ]]

smtctl [ -t ]

Description

This command is provided for privileged users and applications to control utilization of processors with simultaneous multithreading support. The simultaneous multithreading mode allows processors to have thread level parallelism at the instruction level. This mode can be enabled or disabled for all processors either immediately or on subsequent boots of the system. This command controls the simultaneous multithreading options.

Flags

-m off Sets the simultaneous multithreading mode to disabled. This option cannot be used with the -t flag.
-m on Sets the simultaneous multithreading mode to enabled. By using the -m flag, the maximum number of threads supported per processor is enabled. This option cannot be used with the -t flag.
-t #SMT Sets the number of the simultaneous threads per processor. The value may be set to one to disable simultaneous multi-threading. The value may be set to two for systems that support 2-way simultaneous multi-threading and the value may be set to four, for the systems that support 4-way simultaneous multi-threading. This option cannot be used with the -m flag.
-w boot Makes the simultaneous multithreading mode change effective on next and subsequent reboots if you run the bosboot command before the next system reboot.
-w now Makes the simultaneous multithreading mode change immediately but will not persist across reboot. If neither the -w boot or the -w now options are specified, then the mode change is made immediately. It will persist across subsequent reboots if you run the bosboot command before the next system reboot.

If no options are specified then the following simultaneous multithreading settings will be reported:

SMT Capability Indicator that the physical or virtual processors are capable of simultaneous multithreading.
SMT Mode Current runtime simultaneous multithreading mode of disabled or enabled.
SMT Boot Mode Current boot time simultaneous multithreading mode of disabled or enabled.
SMT Threads Number of simultaneous multithreading threads per physical or virtual processor.
SMT Bound Indicator that the simultaneous multithreading threads are bound on the same physical or virtual processor.
SMT Thread Capability Maximum number of simultaneous multi-threading threads per physical or virtual processor supported by the system.

Exit Status

0 Successfully completed the requested operation.
>0 An error occurred.
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