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AIX 5L Practical Performance Tools and Tuning Guide by IBM Redbooks

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4.3. CPU related tuning tools and techniques

This section describes some additional CPU related performance tools and tuning techniques.

4.3.1. The smtctl command

The smtctl command controls the enabling and disabling of processor simultaneous multi-threading mode.

This command is provided for privileged users and applications to control utilization of processors with simultaneous multi-threading support. The simultaneous multi-threading 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 multi-threading options.

Syntax

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

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