AIX Simultaneous Multi-threading (SMT)

July 11, 2016 by S4

Filed under AIX

Last modified July 15, 2016

AIX Simultaneous Multi-threading (SMT)

1.How would I know if my system is capable of using Simultaneous Multi-threading (SMT)?

Your system is capable of SMT if it’s a POWER5-based system running AIX 5L Version 5.3.

2.How would I know if SMT is enabled for my system?
If you run the smtctl command without any options, it tells you if it’s enabled or not.
Is SMT supported for the 32-bit kernel?
Yes, SMT is supported for both 32-bit and 64-bit kernel.

3.How do I enable or disable SMT?
You can enable or disable SMT by running the smtctl command. The following is the syntax:
smtctl [ -m off | on [ -w boot | now]]

The following options are available:
-m off    Sets SMT mode to disabled.
-m on     Sets SMT mode to enabled.
-w boot     Makes the SMT mode change effective on next and subsequent reboots if you run the bosboot command before the next system reboot.
-w now     Makes the SMT 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 persists across subsequent reboots if you run the bosboot command before the next system reboot.
4.How do I get partition-specific information and statistics?
The lparstat command provides a report of partition information and utilization statistics. This command also provides a display of Hypervisor information.

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